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Vafaeva, Khristina Maksudovna, Abhishek Chhetri, Prerak Sudan, Mukul Mishra, B. Pakkiraiah e Chandra Mohan. "Polymer Matrix Nanocomposites for Sustainable Packaging: A Green Approach". E3S Web of Conferences 511 (2024): 01008. http://dx.doi.org/10.1051/e3sconf/202451101008.
Testo completoAbstract (sommario):
This research examines the characteristics and ecological viability of polymer matrix nanocomposites used in sustainable packaging. Nanocomposites were produced by combining varied proportions of polymer and nanofiller material. Through mechanical testing, it was determined that nanocomposite formulation 3 had the maximum tensile strength of 55 MPa, as well as a Young’s modulus of 3.5 GPa, showing greater stiffness in comparison to the other formulations. The evaluation of barrier qualities revealed that nanocomposite formulation 2 exhibited the most minimal oxygen permeability at a rate of 8 cc/m²/day and the lowest water vapor transmission rate at 4.5 g/m²/day, showing very efficient performance in preventing the passage of gases and moisture. The environmental impact study showed that nanocomposite formulation 3 had the most efficient energy consumption during manufacture, with a rate of 1.8 kWh/kg. It also had the lowest waste creation, with just 0.08 kg/kg, and the lowest CO2 emissions, with only 0.4 kg/kg. Nanocomposite formulation 3 demonstrated substantial improvements in mechanical characteristics, barrier properties, and environmental impact indicators when compared to the reference formulations, as shown by the percentage change analysis. In summary, this study showcases the capabilities of polymer matrix nanocomposites, specifically formulation 3, as environmentally friendly packaging materials that offer improved mechanical properties, effective barrier performance, and reduced ecological footprint. These findings contribute to the development of sustainable packaging solutions across different industries.
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Vafaeva, Khristina Maksudovna, Abhishek Chhetri, Prerak Sudan, Mukul Mishra, B. Sankara Babu e Binitendra Naath Mongal. "Polymer Matrix Nanocomposites for Sustainable Packaging: A Green Approach". E3S Web of Conferences 537 (2024): 08001. http://dx.doi.org/10.1051/e3sconf/202453708001.
Testo completoAbstract (sommario):
This research examines the characteristics and ecological viability of polymer matrix nanocomposites used in sustainable packaging. Nanocomposites were produced by combining varied proportions of polymer and nanofiller material. Through mechanical testing, it was determined that nanocomposite formulation 3 had the maximum tensile strength of 55 MPa, as well as a Young's modulus of 3.5 GPa, showing greater stiffness in comparison to the other formulations. The evaluation of barrier qualities revealed that nanocomposite formulation 2 exhibited the most minimal oxygen permeability at a rate of 8 cc/m2/day and the lowest water vapor transmission rate at 4.5 g/m2/day, showing very efficient performance in preventing the passage of gases and moisture. The environmental impact study showed that nanocomposite formulation 3 had the most efficient energy consumption during manufacture, with a rate of 1.8 kWh/kg. It also had the lowest waste creation, with just 0.08 kg/kg, and the lowest CO2 emissions, with only 0.4 kg/kg. Nanocomposite formulation 3 demonstrated substantial improvements in mechanical characteristics, barrier properties, and environmental impact indicators when compared to the reference formulations, as shown by the percentage change analysis. In summary, this study showcases the capabilities of polymer matrix nanocomposites, specifically formulation 3, as environmentally friendly packaging materials that offer improved mechanical properties, effective barrier performance, and reduced ecological footprint. These findings contribute to the development of sustainable packaging solutions across different industries.
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Carrascosa, Ana, Jaime S. Sánchez, María Guadalupe Morán-Aguilar, Gemma Gabriel e Fabiola Vilaseca. "Advanced Flexible Wearable Electronics from Hybrid Nanocomposites Based on Cellulose Nanofibers, PEDOT:PSS and Reduced Graphene Oxide". Polymers 16, n. 21 (29 ottobre 2024): 3035. http://dx.doi.org/10.3390/polym16213035.
Testo completoAbstract (sommario):
The need for responsible electronics is leading to great interest in the development of new bio-based devices that are environmentally friendly. This work presents a simple and efficient process for the creation of conductive nanocomposites using renewable materials such as cellulose nanofibers (CNF) from enzymatic pretreatment, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS), and/or reduced graphene oxide (rGO). Different combinations of CNF, rGo, and PEDOT:PSS were considered to generate homogeneous binary and ternary nanocomposite formulations. These formulations were characterized through SEM, Raman spectroscopy, mechanical, electrical, and electrochemical analysis. The binary formulation containing 40 wt% of PEDOT:PSS resulted in nanocomposite formulations with tensile strength, Young’s modulus, and a conductivity of 70.39 MPa, 3.87 GPa, and 0.35 S/cm, respectively. The binary formulation with 15 wt% of rGO reached 86.19 MPa, 4.41 GPa, and 13.88 S/cm of the same respective properties. A synergy effect was observed for the ternary formulations between both conductive elements; these nanocomposite formulations reached 42.11 S/cm of conductivity and kept their strength as nanocomposites. The 3D design strategy provided a highly conductive network maintaining the structural integrity of CNF, which generated homogenous nanocomposites with rGO and PEDOT:PSS. These formulations can be considered as greatly promising for the next generation of low-cost, eco-friendly, and energy storage devices, such as batteries or electrochemical capacitors.
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Marin, Maria Minodora, Ioana Catalina Gifu, Gratiela Gradisteanu Pircalabioru, Madalina Albu Kaya, Rodica Roxana Constantinescu, Rebeca Leu Alexa, Bogdan Trica et al. "Microbial Polysaccharide-Based Formulation with Silica Nanoparticles; A New Hydrogel Nanocomposite for 3D Printing". Gels 9, n. 5 (19 maggio 2023): 425. http://dx.doi.org/10.3390/gels9050425.
Testo completoAbstract (sommario):
Natural polysaccharides are highly attractive biopolymers recommended for medical applications due to their low cytotoxicity and hydrophilicity. Polysaccharides and their derivatives are also suitable for additive manufacturing, a process in which various customized geometries of 3D structures/scaffolds can be achieved. Polysaccharide-based hydrogel materials are widely used in 3D hydrogel printing of tissue substitutes. In this context, our goal was to obtain printable hydrogel nanocomposites by adding silica nanoparticles to a microbial polysaccharide’s polymer network. Several amounts of silica nanoparticles were added to the biopolymer, and their effects on the morpho-structural characteristics of the resulting nanocomposite hydrogel inks and subsequent 3D printed constructs were studied. FTIR, TGA, and microscopy analysis were used to investigate the resulting crosslinked structures. Assessment of the swelling characteristics and mechanical stability of the nanocomposite materials in a wet state was also conducted. The salecan-based hydrogels displayed excellent biocompatibility and could be employed for biomedical purposes, according to the results of the MTT, LDH, and Live/Dead tests. The innovative, crosslinked, nanocomposite materials are recommended for use in regenerative medicine.
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HAFEZ, INAS H., MOHAMED R. BERBER, KEIJI MINAGAWA, TAKESHI MORI e MASAMI TANAKA. "FORMULATION OF POLYACRYLIC ACID-LAYERED DOUBLE HYDROXIDE COMPOSITE SYSTEM AS A SOIL CONDITIONER FOR WATER MANAGEMENT". International Journal of Modern Physics: Conference Series 06 (gennaio 2012): 138–43. http://dx.doi.org/10.1142/s2010194512003078.
Testo completoAbstract (sommario):
An efficient strategy of soil-conditioner application was offered by incorporating a high molecular weight organic polymer (polyacrylic acid; PAA) into a soil-friendly inorganic material (layered double hydroxide; LDH). The prepared materials were characterized by different spectroscopic techniques to confirm the formed nanocomposite structure. The SEM images captured the morphological ability of PAA-LDH nanocomposites to absorb and keep water molecules during soil-water application. The IR analysis indicated an electrostatic grafting process between PAA units and LDH moieties. The platform of PAA-LDH nanocomposite formulation stabilized the soil aggregates and improved the water-stability.
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Gatos, K. G., A. A. Apostolov e J. Karger-Kocsis. "Compatibilizer Effect of Grafted Glycidyl Methacrylate on EPDM/Organoclay Nanocomposites". Materials Science Forum 482 (aprile 2005): 347–50. http://dx.doi.org/10.4028/www.scientific.net/msf.482.347.
Testo completoAbstract (sommario):
The nanocomposite formation in ethylene/propylene/diene rubber (EPDM) mixed with montmorillonite modified with octadecylamine (MMT-ODA) was investigated. The rubber formulation used proved to be critical for the final materials’ properties. The combined action of the curatives and glycidyl methacrylate (GMA), which was grafted on the EPDM, resulted in better intercalation and enhanced mechanical behavior of the rubber nanocomposites.
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Pinto, Susana C., Paula A. A. P. Marques, Romeu Vicente, Luís Godinho e Isabel Duarte. "Hybrid Structures Made of Polyurethane/Graphene Nanocomposite Foams Embedded within Aluminum Open-Cell Foam". Metals 10, n. 6 (9 giugno 2020): 768. http://dx.doi.org/10.3390/met10060768.
Testo completoAbstract (sommario):
This paper focuses on the development of hybrid structures containing two different classes of porous materials, nanocomposite foams made of polyurethane combined with graphene-based materials, and aluminum open-cell foams (Al-OC). Prior to the hybrid structures preparation, the nanocomposite foam formulation was optimized. The optimization consisted of studying the effect of the addition of graphene oxide (GO) and graphene nanoplatelets (GNPs) at different loadings (1.0, 2.5 and 5.0 wt%) during the polyurethane foam (PUF) formation, and their effect on the final nanocomposite properties. Globally, the results showed enhanced mechanical, acoustic and fire-retardant properties of the PUF nanocomposites when compared with pristine PUF. In a later step, the hybrid structure was prepared by embedding the Al-OC foam with the optimized nanocomposite formulation (prepared with 2.5 wt% of GNPs (PUF/GNPs2.5)). The process of filling the pores of the Al-OC was successfully achieved, with the resulting hybrid structure retaining low thermal conductivity values, around 0.038 W∙m−1∙K−1, and presenting an improved sound absorption coefficient, especially for mid to high frequencies, with respect to the individual foams. Furthermore, the new hybrid structure also displayed better mechanical properties (the stress corresponding to 10% of deformation was improved in more than 10 and 1.3 times comparatively to PUF/GNPs2.5 and Al-OC, respectively).
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Guz, Alexander N., e Jeremiah J. Rushchitsky. "Some Fundamental Aspects of Mechanics of Nanocomposite Materials and Structural Members". Journal of Nanotechnology 2013 (2013): 1–16. http://dx.doi.org/10.1155/2013/641581.
Testo completoAbstract (sommario):
This paper is devoted to formulation and analysis of fundamental aspects of mechanics of nanocomposite materials and structural members. These aspects most likely do not exhaust all of the possible fundamental characteristics of mechanics of nanocomposite materials and structural members, but, nevertheless, they permit to form the skeleton of direction of mechanics in hand. The proposed nine aspects are described and commented briefly.
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Reddy, J. N., Vinu U. Unnikrishnan e Ginu U. Unnikrishnan. "Recent advances in the analysis of nanotube-reinforced polymeric biomaterials". Journal of the Mechanical Behavior of Materials 22, n. 5-6 (1 dicembre 2013): 137–48. http://dx.doi.org/10.1515/jmbm-2013-0021.
Testo completoAbstract (sommario):
AbstractConventional experimental or computational techniques are often inadequate for the analysis and development of nanocomposite-based materials as they are tedious (e.g., experimental methods) or are unsuitable to capture the properties of these novel materials (e.g., conventional computational techniques), thereby requiring multiscale computational strategies. During the last 5 years, major developments were made by the authors on the formulation and implementation of multiscale computational models, using atomistic simulation and micro-mechanics-based techniques, to study the mechanical and thermal behavior of nanocomposite-based materials. In this article, the advances made in the computational analysis of nanocomposites for tissue engineering applications (e.g., scaffolds and bioreactors) would be discussed. The material properties of the nanocomposites in the lower scales were determined using molecular dynamics, and were then transferred to the macroscale using various homogenization techniques. Also in this article, the authors discuss the development of a theory of mixture-based finite element model for nutrient flow in a hollow fiber membrane bioreactor and the use of computational tools to improve the efficiency of the bioreactor.
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Najem Abed, Nisreen Abdul Rahman, Suha Mujahed Abudoleh, Iyad Daoud Alshawabkeh, Abdul Rahman Najem Abed, Rasha Khaled Ali Abuthawabeh e Samer Hasan Hussein-Al-Ali. "Aspirin Drug Intercalated into Zinc-Layered Hydroxides as Nanolayers: Structure and In Vitro Release". Nano Hybrids and Composites 18 (novembre 2017): 42–52. http://dx.doi.org/10.4028/www.scientific.net/nhc.18.42.
Testo completoAbstract (sommario):
Zinc layered hydroxides (ZLHs) can be used as host materials for drug-ZLH host–guest structures. Aspirin with 0.1 and 0.4 M were intercalated into zinc layered hydroxides to form aspirin nanocomposites; ASPN1 and ASPN4, respectively. From XRD and software, the interlayer spacing of ASPN1 and ASPN4 was 15.2 Å. The result coupled with molecular geometry calculation indicates that the spatial orientation of the drug in the ZLH was monolayer for ASPN1 and ASPN4 nanocomposites. The release of the aspirin from ASPN4 nanocomposite at pH 6.8 is 35%, compared to 98% at pH 1.2, and followed Hixson model and Korsmeyer model for ASPN4 at pH 6.8 and pH 1.2, respectively. This result indicates sustained release of the drugs from their respective nanocomposites, and therefore these nanocomposites have good potential to be used as controlled-release formulation of the aspirin. The ASPN4 nanocomposite was highly effective to Escherichia coli compared to free aspirin, where the ASPN4 given 1.37 inhibition zone compared to aspirin which given 1.17 cm inhibition zone.
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Shanmugam, Rajeshkumar, Rajaduraipandian Subramaniam, Sabeena Gabrial Kathirason, Daoud Ali, Sri Renukadevi Balusamy, Annadurai Gurusamy, Kalirajan Arunachalam e Hanen Sellami. "Curcumin-Chitosan Nanocomposite Formulation Containing Pongamia pinnata-Mediated Silver Nanoparticles, Wound Pathogen Control, and Anti-Inflammatory Potential". BioMed Research International 2021 (23 dicembre 2021): 1–10. http://dx.doi.org/10.1155/2021/3091587.
Testo completoAbstract (sommario):
Background. Because of its diverse range of use in several ethics of diagnosis and care of multiple diseases, nanotechnology has seen remarkable growth and has become a key component of medical sciences. In recent years, there has been rapid advancement in medicine and biomaterials. Nanomedicine aids in illness prevention, diagnosis, monitoring, and treatment. Aim. The purpose of this work is to evaluate the antibacterial, anti-inflammatory, and cytotoxic capabilities of green produced silver nanoparticle with the addition of curcumin-assisted chitosan nanocomposite (SCCN) against wound pathogenic as reducing agents. Materials and Methods. The plant extract of Pongamia pinnata, silver nanoparticles, and its based curcumin nanoformulations was studied in this study utilizing UV visible spectrophotometer, selected area electron diffraction (SAED), and TEM. Anti-inflammatory, antimicrobial, and cytotoxic tests were performed on silver nanoparticles with the addition of curcumin-assisted chitosan nanocomposite (SCCN). Furthermore, these produced nanocomposites were coated on clinical silk and tested for antibacterial activity. Results. The produced silver nanoparticle with the addition of curcumin-assisted chitosan nanocomposite (SCCN) has significant antibacterial activities against Pseudomonas aeruginosa and staphylococcus aureus. They are as well as possess anti-inflammatory activity and furthermore prove to be biocompatible. Conclusion. This advancement in the field of biomaterials, which means nanocomposite, not only helps to reduce the harmful effects of pathogenic organisms while representing an environmentally benign material but it also shows to be a material with zero danger to humans and the environment.
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Mohamad, Ebtesam A., Amany M. Gad, Rana H. Abd El-Rhman e Mirhane M. Darwish. "Chitosan and Aloe Vera decorated nanoparticulate system loaded with Minoxidil as a suggested topical formulation for alopecia therapy". Advances in Natural Sciences: Nanoscience and Nanotechnology 14, n. 2 (27 aprile 2023): 025002. http://dx.doi.org/10.1088/2043-6262/accc7e.
Testo completoAbstract (sommario):
Abstract Minoxidil (Mxd) is a common medication used for hair regrowth in patients exhibiting different types of alopecia, especially androgenetic alopecia (AGA), but it has some negative aspects such as causing adverse effects and having limited permeation through the outer skin layers. In this study, minoxidil was encapsulated into niosomes and then loaded into chitosan nanoparticles and Aloe vera for creating a nanocomposite (Cs@Alo/Nio-Mxd), which will be used as a topical formulation to overcome these difficulties. The various prepared samples were physico-chemically characterised by their loading efficiency, TEM, SEM, zeta potential, FTIR and in vitro release profiles. The hair growth potential of the prepared formulations was evaluated by an in vivo study using rats with induced alopecia. Thirty-six rats with induced alopecia were randomised into six groups of six rats each. Group 1 (Negative control): rats served as normal and were treated with normal saline, Group 2: rats were treated with topical application of empty nanocomposites. Group 3 (Positive control): rats were treated with topical application of 5% Mxd, Group 4: rats were treated with topical application of (Cs-Mxd NPs), Group 5: rats were treated with topical application of (Cs@Alo-Mxd NPs). Group 6: rats were treated with topical application of (Cs@Alo/Nio-Mxd) nanocomposite. All formulations were applied once daily for 21 days. The treated skin was observed, photographed, and its histological features were examined. Results specified that Cs@Alo/Nio-Mxd nanocomposite could be preferentially deposited into the hair follicles, causing a significant increase (p < 0.05) in skin thickness, total hair follicle number per field, hair follicle diameter, hypodermis hair follicle number and anagen induction percentage.
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Morici, Elisabetta, Rossella Arrigo e Nadka Tz Dintcheva. "On the role of multi-functional polyhedral oligomeric silsesquioxane in polystyrene-zinc oxide nanocomposites". Journal of Polymer Engineering 35, n. 4 (1 maggio 2015): 329–37. http://dx.doi.org/10.1515/polyeng-2014-0212.
Testo completoAbstract (sommario):
Abstract Multi-functional trisilanol phenyl (TSPH) and trisilanol isobutyl (TSIB) polyhedral oligomeric silsesquioxane (POSS) have been used in the formulation of advanced polystyrene (PS)-zinc oxide (ZnO) nanocomposites. The neat matrix and PS/ZnO-based nanocomposites have been characterized through rheological, morphological, mechanical, and dynamic thermo-mechanical analysis. Both TSPH and TSIB are able to improve the dispersion of ZnO into the polystyrene matrix; furthermore, adding TSIB leads to better results because it facilitates better solubility into the PS matrix and interaction/reaction with the ZnO nanopowder. Finally, the optical properties and photo-oxidative resistance of the nanocomposite films have been evaluated. The POSS molecules synergistically interact with ZnO nanopowder in the protection of PS matrix against photo-oxidative process. The nanocomposite films containing both ZnO and POSS molecules, particularly TSIB, exhibit better UV-shielding properties than the PS/ZnO one, without loss of optical transparency.
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Rai, Ashwin, Nithya Subramanian, Bonsung Koo e Aditi Chattopadhyay. "Multiscale damage analysis of carbon nanotube nanocomposite using a continuum damage mechanics approach". Journal of Composite Materials 51, n. 6 (28 luglio 2016): 847–58. http://dx.doi.org/10.1177/0021998316654304.
Testo completoAbstract (sommario):
A multiscale-modeling framework is presented to understand damage and failure response in carbon nanotube reinforced nanocomposites. A damage model is developed using the framework of continuum damage mechanics with a physical damage evolution equation inspired by molecular dynamics simulations. This damage formulation is applied to randomly dispersed carbon nanotube reinforced nanocomposite unit cells with periodic boundary conditions to investigate preferred sites and the tendency towards damage. The continuum model is seen as successfully capturing much of the unique nonlinear trends observed in the molecular dynamics simulations in a volume 1000 times greater than the molecular dynamics unit cell. Additionally, application of the damage model to the continuum unit cell revealed insights into the failure of carbon nanotube reinforced nanocomposites at the sub-microscale.
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Asif, Afzal Haq, Mahendra S. Mahajan, Nagaraja Sreeharsha, Vikas V. Gite, Bandar E. Al-Dhubiab, Feroze Kaliyadan, Shivakumar H. Nanjappa, Girish Meravanige e Dalal Mishary Aleyadhy. "Enhancement of Anticorrosive Performance of Cardanol Based Polyurethane Coatings by Incorporating Magnetic Hydroxyapatite Nanoparticles". Materials 15, n. 6 (20 marzo 2022): 2308. http://dx.doi.org/10.3390/ma15062308.
Testo completoAbstract (sommario):
The present investigation demonstrates renewable cardanol-based polyol for the formulation of nanocomposite polyurethane (PU) coatings. The functional and structural features of cardanol polyol and nanoparticles were studied using FT-IR and 1H NMR spectroscopic techniques. The magnetic hydroxyapatite nanoparticles (MHAPs) were dispersed 1–5% in PU formulations to develop nanocomposite anticorrosive coatings. An increase in the strength of MHAP increased the anticorrosive performance as examined by immersion and electrochemical methods. The nanocomposite PU coatings showed good coating properties, viz., gloss, pencil hardness, flexibility, cross-cut adhesion, and chemical resistance. Additionally, the coatings were also studied for surface morphology, wetting, and thermal properties by scanning electron microscope (SEM), contact angle, and thermogravimetric analysis (TGA), respectively. The hydrophobic nature of PU coatings increased by the addition of MHAP, and an optimum result (105°) was observed in 3% loading. The developed coatings revealed its hydrophobic nature with excellent anticorrosive performance.
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Vattathurvalappil, Suhail Hyder, Mahmoodul Haq e Saratchandra Kundurthi. "Hybrid nanocomposites—An efficient representative volume element formulation with interface properties". Polymers and Polymer Composites 30 (gennaio 2022): 096739112210846. http://dx.doi.org/10.1177/09673911221084651.
Testo completoAbstract (sommario):
Reinforcement of polymers with multiple inclusions of varying length scales and morphologies enable enhancement and tailorability of thermo-mechanical properties in resulting polymers. Computational material models can eliminate the trial-and-error approach of developing these hybrid reinforced polymers, enable prediction of interphase properties, and allow virtual exploration of design space. In this work, computational models, specifically representative volume elements were developed for acrylonitrile butadiene styrene polymer reinforced with nanoscale iron oxide particles and micro-scale short carbon fibers. These representative volume elements were used to predict the tensile modulus of resulting polymer nanocomposite with varying particle concentrations, orientations, interphases, and clustering to realistically replicate the actual material as observed in optical and electron microscopy. The interphase elastic modulus was obtained through established analytical formulations and incorporated into the representative volume elements by defining an interphase region around the reinforcements. The tensile modulus estimated using representative volume elements agreed well with the experiments, evidently showing that the effective tensile modulus of the polymer nanocomposite increased with increase in interphase thickness, aspect ratio, and particle content. Clustering was only observed in Fe3O4 nanoparticles but its size did not have any effect on the effective tensile modulus. The developed computational modeling framework and the resultant prediction of tensile modulus offers a design path which can be extended to other polymer nanocomposites containing multiple inclusions.
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Alhussein, Abdullah, Rashed Alsahafi, Areej Alfaifi, Mohammad Alenizy, Ibrahim Ba-Armah, Abraham Schneider, Mary-Ann Jabra-Rizk et al. "Novel Remineralizing and Antibiofilm Low-Shrinkage-Stress Nanocomposites to Inhibit Salivary Biofilms and Protect Tooth Structures". Materials 16, n. 20 (19 ottobre 2023): 6770. http://dx.doi.org/10.3390/ma16206770.
Testo completoAbstract (sommario):
Recurrent caries remain a persistent concern, often linked to microleakage and a lack of bioactivity in contemporary dental composites. Our study aims to address this issue by developing a low-shrinkage-stress nanocomposite with antibiofilm and remineralization capabilities, thus countering the progression of recurrent caries. In the present study, we formulated low-shrinkage-stress nanocomposites by combining triethylene glycol divinylbenzyl ether and urethane dimethacrylate, incorporating dimethylaminododecyl methacrylate (DMADDM), along with nanoparticles of calcium fluoride (nCaF2) and nanoparticles of amorphous calcium phosphate (NACP). The biofilm viability, biofilm metabolic activity, lactic acid production, and ion release were evaluated. The novel formulations containing 3% DMADDM exhibited a potent antibiofilm activity, exhibiting a 4-log reduction in the human salivary biofilm CFUs compared to controls (p < 0.001). Additionally, significant reductions were observed in biofilm biomass and lactic acid (p < 0.05). By integrating both 10% NACP and 10% nCaF2 into one formulation, efficient ion release was achieved, yielding concentrations of 3.02 ± 0.21 mmol/L for Ca, 0.5 ± 0.05 mmol/L for P, and 0.37 ± 0.01 mmol/L for F ions. The innovative mixture of DMADDM, NACP, and nCaF2 displayed strong antibiofilm effects on salivary biofilm while concomitantly releasing a significant amount of remineralizing ions. This nanocomposite is a promising dental material with antibiofilm and remineralization capacities, with the potential to reduce polymerization-related microleakage and recurrent caries.
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Darekar, Avinash, Mrudula Bele, Milind Wagh, Vanashri Nawale e Ravindranath Saudagar. "A review on Nanocomposite Drug Delivery". Journal of Drug Delivery and Therapeutics 9, n. 2-s (15 aprile 2019): 529–36. http://dx.doi.org/10.22270/jddt.v9i2-s.2475.
Testo completoAbstract (sommario):
Low aqueous solubility is the major problem come across the formulation development of new chemical entities as well as for the generic development. Supplementary than 40% New Chemical Entities developed in pharmaceutical industry are practically insoluble in water. Hence, there is a need for boosting the solubility and dissolution of such drugs. Enhancement of the solubility and dissolution of the practically insoluble drug was achieved by forming nanocomposites. Nanocomposities are formed by using synthetic polymers such as gelatin, chitosan, polyvinyl pyrollidone, carboxymethyl cellulose, etc. Selection of polymers was based on their surfactant and wetting properties. To check the solubility enhancement of drugs solubility studies is carried out. Nanocomposites are characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, X-ray diffraction studies, scanning electron microscopy and transmission electron microscopy. As the concentration of polymer in the composite increased the solubility and dissolution of poorly water soluble drug were enhanced. In end, new technology require substances showing novel properties and/or progressed performance in comparison to conventionally processed additives. In this context, nanocomposites are appropriate materials to meet the emerging needs bobbing up from medical and technologic advances. Keywords: nanocomposites, polymers, synthesis.
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Su, Jiaxin, Yan Hu, Bin Zhou, Yinghua Ye e Ruiqi Shen. "The Role of Graphene Oxide in the Exothermic Mechanism of Al/CuO Nanocomposites". Molecules 27, n. 21 (6 novembre 2022): 7614. http://dx.doi.org/10.3390/molecules27217614.
Testo completoAbstract (sommario):
Metastable intermixed composites (MICs) have received increasing attention in the field of energy materials in recent years due to their high energy and good combustion performance. The exploration of ways of improving their potential release of heat is still underway. In this study, Al–CuO/graphene oxide (GO) nanocomposites were prepared using a combination of the self-assembly and in-suit synthesis methods. The formulation and experimental conditions were also optimized to maximize the exothermic heat. The DSC analysis shows that the addition of the GO made a significant contribution to the exothermic effect of the nanothermite. Compared with the Al–CuO nanothermite, the exothermic heat of the Al–CuO/GO nanocomposites increase by 306.9–1166.3 J/g and the peak temperatures dropped by 7.9–26.4 °C with different GO content. The reaction mechanism of the nanocomposite was investigated using a DSC and thermal reaction kinetics analysis. It was found that, compared with typical thermite reactions, the addition of the GO changed the reaction pathway of the nanothermite. The reaction products included CuAlO2. Moreover, the combustion properties of nanocomposite were investigated. This work reveals the unique mechanism of GO in thermite reactions, which may promote the application of carbon materials in nanothermite.
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Bibi, Shabana, Sadullah Mir, Wajid Rehman, Farid Menaa, Alia Gul, Fatima Saad Salem Alaryani, Ali M. Alqahtani, Sirajul Haq e Magda H. Abdellatif. "Synthesis and In Vitro/Ex Vivo Characterizations of Ceftriaxone-Loaded Sodium Alginate/poly(vinyl alcohol) Clay Reinforced Nanocomposites: Possible Applications in Wound Healing". Materials 15, n. 11 (30 maggio 2022): 3885. http://dx.doi.org/10.3390/ma15113885.
Testo completoAbstract (sommario):
(1) Background: Nanocomposite films are widely applied in the pharmaceutical industry (e.g., nanodrug delivery systems—NDDS). Indeed, these nanomaterials can be produced at a large industrial scale and display valuable properties (e.g., antibacterial, renewability, biodegradability, bioavailability, safety, tissue-specific targeting, and biocompatibility), which can enhance the activity of conventional marketed drugs. (2) Aim: To fabricate and investigate the in vitro properties of the antibiotic ceftriaxone sodium (CTX) once encapsulated into sodium alginate (SA)/poly(vinyl alcohol)PVA-clay reinforced nanocomposite films. (3) Methods: Different ratios of the polymers (i.e., SA, PVA) and CTX drug were used for the synthesis of nanocomposite films by solvent casting technique. Montmorillonite (MMT), modified organically, was added as a nanofiller to increase their thermal and mechanical strength. The prepared samples were physically characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electronic microscopy (SEM), and energy-dispersive X-ray analysis (EDX). The physicochemical behavior (i.e., swelling, erosion, dissolution/drug release behavior and rat skin permeation) was also assessed. Comparisons were made with the currently marketed free CTX dosage form. (4) Results: TGA of the nanoformulation showed increased thermostability. XRD revealed its semi-crystalline nature. SEM depicted a homogeneous drug-loaded SA/PVA nanocomposite with an average size ranging between 300 and 500 nm. EDX confirmed the elemental composition and uniform distribution of mixing components. The water entrapment efficiency study showed that the highest swelling and erosion ratio is encountered with the nanoformulations S100(3) and S100D15(3). Ex vivo permeation revealed a bi-step discharge mode with an early burst liberation chased by continued drug discharge of devised nanoparticles (NPs). The dissolution studies of the drug-loaded polymer nanocomposites elicited sustained pH-dependent drug release. The cumulative drug release was the highest (90.93%) with S100D15(3). (5) Conclusion: S100D15(3) was the finest formulation. To the best of our knowledge, we also pioneered the use of solvent casting for the preparation of such nanoformulations. Polymers and reinforcing agent, concentrations and pH were rate-deterring features for the preparation of the optimized formulation. Thus, CTX-loaded SA/PVA-MMT reinforced nanocomposite appeared as a promising nanodrug delivery system (NDDS) based on its in vitro physicochemical properties.
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de Castro Folgueras, Luiza, e Mirabel Cerqueira Rezende. "Microwave Absorbing Nanocomposites Composed with and without Polyaniline by Use as Radar Absorbing Structure". Materials Science Forum 730-732 (novembre 2012): 920–24. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.920.
Testo completoAbstract (sommario):
In the past decade, new materials have been developed based on the physical and chemical properties of carbon nanotubes. The combination of polyaniline with multiwall carbon nanotubes results in a new functional material with advantageous electromagnetic properties. The objective of this study was to produce a radar absorbing structure consisting of glass fiber woven fabric impregnated with a formulation containing carbon nanotubes, polyurethane resin, with or without polyaniline. A different formulation was used for each woven sheet (multilayer structure). The electromagnetic properties of these nanocomposite materials were characterized by reflectivity measurements using Naval Research Laboratory arch method (frequency range, 8 to 12 GHz). The attenuation of both sides of each nanocomposite material was also measured and compared. The attenuation of electromagnetic energy was as high as 70 %, approximately, indicating that these materials can be used as microwave absorbers.
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Weltrowski, Marek, e Patricia I. Dolez. "Compatibilizer Polarity Parameters as Tools for Predicting Organoclay Dispersion in Polyolefin Nanocomposites". Journal of Nanotechnology 2019 (3 marzo 2019): 1–9. http://dx.doi.org/10.1155/2019/1404196.
Testo completoAbstract (sommario):
Nanocomposites give an innovative method to increase the mechanical, thermal, and barrier performance of polymers. However, properly dispersing the nanoparticles in the polymer matrix is often key in achieving high performance, especially in the case of hydrophilic nanoparticles and hydrophobic polymers. For that purpose, nanoparticles may be functionalized with organic groups to increase their affinity with the polymer matrix. Compatibilizing agents may also be included in the nanocomposite formulation. This paper aims at identifying parameters relative to the compatibilizer polarity that would allow predicting nanoparticle dispersion in the polymer nanocomposite. The analysis used published data on nanocomposite samples combining clay nanoparticles, polyolefins, and various compatibilizing agents. We studied the correlations between the nanoclay exfoliation ratio and five different parameters describing the compatibilizer hydrophilic-lipophilic balance: the acid value, the mole, and weight fraction of polar groups, the number of polymer chain units per polar group, and the number of moles of polar groups per mole of compatibilizer. The best correlation was observed with the number of polymer chain units per polar group in the compatibilizer. This parameter could be used as a tool to predict the dispersion of organoclay nanoparticles in polyolefins. Another important result of the study is that, among the compatibilizers investigated, those with a low acid value provided a better nanoclay exfoliation compared to those with a high acid value. This may indicate the existence of a maximum in the nanoclay exfoliation/compatibilizer polarity curve, which would open new perspectives for nanocomposite performance optimization.
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Macchia, Eleonora, Alla Zak, Rosaria Anna Picca, Kyriaki Manoli, Cinzia Di Franco, Nicola Cioffi, Gaetano Scamarcio, Reshef Tenne e Luisa Torsi. "Improved Performance p-type Polymer (P3HT) / n-type Nanotubes (WS2) Electrolyte Gated Thin-Film Transistor". MRS Advances 3, n. 27 (2018): 1525–33. http://dx.doi.org/10.1557/adv.2018.311.
Testo completoAbstract (sommario):
ABSTRACTThis work decribes the enhancement of the electrical figures of merit of an Electrolyte Gated Thin-Film Transistor (EG-TFT) comprising a nanocomposite of n-type tungsten disulfide (WS2) nanotubes (NTs) dispersed in a regio-regular p-type poly(3-hexylthiophene-2,5-diyl) (P3HT) polymeric matrix. P3HT/WS2 nanocomposites loaded with different concentrations of NTs, serving as EG-TFTs electronic channel materials have been studied and the formulation has been optimized. The resulting EG-TFTs figures of merit (field-effect mobility, threshold voltage and on-off ratio) are compared with those of the device comprising a bare P3HT semiconducting layer. The optimized P3HT/WS2 nanocomposite, comprising a 60% by weight of NTs, results in an improvement of all the elicited figures of merit with a striking ten-fold increase in the field-effect mobility and the on/off ratio along with a sizable enhancement of the in-water operational stability of the device.
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Rienzie, Ryan, Lasantha Sendanayake, Devika De Costa, Akbar Hossain, Marian Brestic, Milan Skalicky, Pavla Vachova e Nadeesh M. Adassooriya. "Assessing the Carboxymethylcellulose Copper-Montmorillonite Nanocomposite for Controlling the Infection of Erwinia carotovora in Potato (Solanum tuberosum L.)". Nanomaterials 11, n. 3 (21 marzo 2021): 802. http://dx.doi.org/10.3390/nano11030802.
Testo completoAbstract (sommario):
A novel antimicrobial formulation based on carboxymethylcellulose (CMC) spray-coated Cu2+ intercalated montmorillonite (MMT) nanocomposite material was prepared and its morphology, internal structure, and bonding interactions were studied. Meanwhile, the antibacterial efficacy and release behavior of Cu2+ was also determined. PXRD patterns indicated the intercalation of Cu2+, while FTIR spectra and TGA traces confirmed the association of Cu−MMT with CMC. SEM study revealed the improvement of nanocomposites by CMC, without disturbing the clay structure. TEM and EDAX studies indicated the distribution of Cu (copper) throughout the composite. In vitro antibacterial assays performed with Erwinia carotovora revealed effective bacterial growth suppression, indicating the potential of this material in controlling soft rot of potatoes (Solanum tuberosum); also observed was a connection between growth inhibition and concentration of CMC spray coats indicating a positive relationship between Cu2+ release and concentration of the CMC coatings. The activity pattern of the nanocomposite displayed a significant degree of sustained-release behavior.
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Peng, Fei, Xiuping Wang, Wenjing Zhang, Xuejuan Shi, Caihong Cheng, Wenlong Hou, Xiaohu Lin, Xiaolu Xiao e Jun Li. "Nanopesticide Formulation from Pyraclostrobin and Graphene Oxide as a Nanocarrier and Application in Controlling Plant Fungal Pathogens". Nanomaterials 12, n. 7 (28 marzo 2022): 1112. http://dx.doi.org/10.3390/nano12071112.
Testo completoAbstract (sommario):
Efficient and environment-friendly nanopesticide delivery systems are critical for the sustainable development of agriculture. In this study, a graphene oxide nanocomposite was developed for pesticide delivery and plant protection with pyraclostrobin as the model pesticide. First, graphene oxide–pyraclostrobin nanocomposite was prepared through fast adsorption of pyraclostrobin onto graphene oxide with a maximum loading of 87.04%. The as-prepared graphene oxide–pyraclostrobin nanocomposite exhibited high stability during two years of storage, suggesting its high potential in practical application. The graphene oxide–pyraclostrobin nanocomposite could achieve temperature (25 °C, 30 °C and 35 °C) and pH (5, 7 and 9) slow-release behavior, which overcomes the burst release of conventional pyraclostrobin formulation. Furthermore, graphene oxide–pyraclostrobin nanocomposite exhibited considerable antifungal activities against Fusarium graminearum and Sclerotinia sclerotiorum both in vitro and in vivo. The cotoxicity factor assay revealed that there was a synergistic interaction when graphene oxide and pyraclostrobin were combined at the ratio of 1:1 against the mycelial growth of Fusarium graminearum and Sclerotinia sclerotiorum with co-toxicity coefficient values exceeding 100 in vitro. The control efficacy of graphene oxide–pyraclostrobin nanocomposite was 71.35% and 62.32% against Fusarium graminearum and Sclerotinia sclerotiorum in greenhouse, respectively, which was higher than that of single graphene oxide and pyraclostrobin. In general, the present study provides a candidate nanoformulation for pathogenic fungal control in plants, and may also expand the application of graphene oxide materials in controlling plant fungal pathogens and sustainable agriculture.
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Swain, Ashirbad, e Tarapada Roy. "Viscoelastic material damping characteristics of carbon nanotubes based functionally graded composite shell structures". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, n. 8 (29 marzo 2018): 1510–41. http://dx.doi.org/10.1177/1464420718764513.
Testo completoAbstract (sommario):
This work deals with the study of viscoelastic modeling and vibration analysis of functionally graded nanocomposite shell panels where carbon nanotubes are reinforced in the polymer matrix based on the functionally graded distributions of carbon nanotubes. Five types of grading of carbon nanotubes (such as UD, FGX, FGV, FGO, and FGΛ) in the thickness directions have been considered in order to investigate the vibration damping performance of such composite shell panels. A detailed mathematical formulation for the determination viscoelastic properties is presented. The Mori–Tanaka micromechanics in conjunction with weak interface theory has been developed for the mathematical formulations of the viscoelastic modeling of carbon nanotubes based polymer matrix phase. An eight-noded shell element with five degrees-of-freedom per node has been formulated to study the vibration damping characteristics of various panels made by such functionally graded nanocomposite materials. The shell finite element formulation is based on the transverse shear effects as per the Mindlin’s hypothesis, and stress resultant-type Koiter’s shell theory. Impulse and frequency responses of such structures have been performed to study the effects of various important parameters (such as volume fraction of carbon nanotubes, interfacial condition, agglomeration, temperature, geometries of shell panel) on the dynamic responses. Obtained results demonstrate that quick vibration mitigation may be possible using such carbon nanotubes based proposed composite materials.
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Vignesh, C., K. Vinoth, J. Emima Jeronsia, L. Chinnappa, Faheem Ahmed, Zishan Husain Khan, Nasser M. Abd El-Salam e Hassan Fouad. "Enhancement of Thermoelectric Properties in Nanocomposites Through the Synergistic Integration of Zinc and Iron Oxides with Polyaniline". Science of Advanced Materials 16, n. 2 (1 febbraio 2024): 167–76. http://dx.doi.org/10.1166/sam.2024.4630.
Testo completoAbstract (sommario):
In this study, we systematically varied the weight ratios of zinc and iron oxides (2 wt%, 4 wt%, and 6 wt%) to fabricate nanocomposites consisting of polyaniline (PANI), zinc oxide (ZnO), and iron oxide (Fe3O4) through the sol–gel method. Comprehensive analyses using FTIR, XRD, and SEM were conducted to elucidate the functional groups, particle size, crystal structure, and surface morphologies of PANI/ZnO/Fe3O4 nanocomposites. Furthermore, thermoelectric characteristics were thoroughly investigated. A mechanistic insight into the PANI/ZnO/Fe3O4 nanocomposite formation was proposed based on the FTIR findings. SEM investigations revealed the presence of spherical particles in all nanocomposites. Among the three PANI/ZnO/Fe3O4 nanocomposites characterized, the formulation with 6 wt% exhibited superior thermoelectric performance. The electrical conductivity of the nanocomposites exhibited a notable increase from 23.1 to 42.7 mS/cm when the temperature elevated from 30–90 °C. Concurrently, the thermal conductivity exhibited a decline from 1.229 to 0.704 Wm−1K−1, resulting in an augmented figure of merit of 0.024. This enhancement underscores the positive influence of increasing the weight percentage of ZnO and Fe3O4 with PANI on the TE performances of the nanocomposites.
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Sharudin, Rahida Wati, Nik Salwani Md Azmi, Anuaruddin Hanizan, Suffiyana Akhbar, Zakiah Ahmad e Masahiro Ohshima. "Dynamic Molecular Simulation of Polyethylene/Organoclay Nanocomposites for Their Physical Properties and Foam Morphology". Materials 16, n. 8 (15 aprile 2023): 3122. http://dx.doi.org/10.3390/ma16083122.
Testo completoAbstract (sommario):
Polyethylene materials are of great interest to be used in many applications due to their many advantageous characteristics. It is light, highly chemical resistant, easy to process, low in cost and has good mechanical properties. Polyethylene is widely used as a cable-insulating material. However, research is still needed to further improve its insulation quality and properties. In this study, an experimental and alternative approach through a dynamic modeling method was conducted. The main objective was to investigate the effect of modified organoclay concentration on the properties of polyethylene/organoclay nanocomposites by observing their characterization and optical and mechanical properties. The thermogram curve reveals that 2 wt% organoclay used has the highest crystallinity (46.7%) while the highest amount of organoclay used produced the lowest crystallinity (31.2%). The presence of cracks was also observed mostly in the nanocomposite with higher content of organoclay, usually where 2.0 wt% and above of organoclay was used. Morphological observation from simulation results supports the experimental work. Only small pores were observed to form in lower concentrations, and as the concentration was increased to 2.0 wt% and above, the pores present became larger in size. Increasing the concentration of organoclay up to 2.0 wt% reduced the interfacial tension while increasing the concentration above 2.0 wt% did not bring any changes to the interfacial tension value. Different formulations produced different behavior of nanocomposite. Hence the control of the formulation was important to control the final result of the products for appropriate application in different sectors of industry.
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Yılmaz, Onur, Aurica P. Chiriac, Catalina Natalia Cheaburu, Loredana E. Nita, Gürbüz Gülümser, Donatella Duraccio, Sossio Cimmino e Cornelia Vasile. "Nanocomposites Based on Montmorillonite/Acrylic Copolymer for Aqueous Coating of Soft Surfaces". Solid State Phenomena 151 (aprile 2009): 129–34. http://dx.doi.org/10.4028/www.scientific.net/ssp.151.129.
Testo completoAbstract (sommario):
Nanocomposites based on layered silicate organically modified montmorillonite (Cloisite 20A) and acrylic comonomers (butyl acrylate and methyl methacrylate) were prepared by simple “in situ” batch emulsion polymerization method. The particle size and zeta potential of the emulsions were analyzed. The structural characterizations of the nanocomposites were performed by FTIR, thermal behaviors of the films were investigated by DSC, mechanical properties of the films were tested by DMA and intercalation success was viewed by XRD. The mechanical properties of the nanocomposites were improved significantly especially at the temperatures above Tg. The ultrasonication process was found to be useful for increasing the homogeneity of the emulsions and intercalation success. The obtained nanocomposite emulsions were applied on garment leathers in a finishing formulation as aqueous binders sharing good film forming ability and elasticity.
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Puertas, María Luisa, Teresa Durán, José Florindo Bartolomé e Antonio Esteban-Cubillo. "Synthesis of a Zinc Hydroxystannate/Sepiolite Hybrid Additive to Avoid Fire Propagation and Reduce Smoke Emission of EPDM Rubber Nanocomposites". Materials 15, n. 18 (10 settembre 2022): 6297. http://dx.doi.org/10.3390/ma15186297.
Testo completoAbstract (sommario):
A zinc hydroxystannate/sepiolite (SEPZHS) hybrid additive was successfully prepared following a facile wet chemical route synthesis where zinc hydroxystannate (ZHS) nanoparticles were grown on the sepiolite’s surface. SEPZHS particles have a fibrillar structure with ZHS nanoparticles homogeneously dispersed and with significantly smaller particle sizes than the synthesized ZHS nanoparticles alone. Sepiolite and SEPZHS were organically modified and introduced in a basic ethylene propylene diene monomer rubber (EPDM) formulation for cable to evaluate the nanocomposite behavior under direct fire sources. The results confirmed the synergistic effect of the hybrid SEPZHS additive in the formation of a most stable and efficient char barrier, thus improving the flame-retardant behavior of EPDM nanocomposite in terms of heat emission, with reductions of more than 40% in the peak of Heat Release Rate (cone calorimeter test), and smoke suppression, with more than 25% reduction in the Total Smoke Production and Smoke Density parameters (smoke chamber test). Moreover, the addition of sepiolite-based additives increased the mechanical properties (hardness) of the nanocomposites, as a result of the matrix reinforcement. This suggests that the SEPZHS hybrid additive may provide a promising option for a new, cost-effective, eco-friendly, yet efficient flame-retardant solution.
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Tawade, Bhausaheb V., Ikeoluwa E. Apata, Nihar Pradhan, Alamgir Karim e Dharmaraj Raghavan. "Recent Advances in the Synthesis of Polymer-Grafted Low-K and High-K Nanoparticles for Dielectric and Electronic Applications". Molecules 26, n. 10 (15 maggio 2021): 2942. http://dx.doi.org/10.3390/molecules26102942.
Testo completoAbstract (sommario):
The synthesis of polymer-grafted nanoparticles (PGNPs) or hairy nanoparticles (HNPs) by tethering of polymer chains to the surface of nanoparticles is an important technique to obtain nanostructured hybrid materials that have been widely used in the formulation of advanced polymer nanocomposites. Ceramic-based polymer nanocomposites integrate key attributes of polymer and ceramic nanomaterial to improve the dielectric properties such as breakdown strength, energy density and dielectric loss. This review describes the “grafting from” and “grafting to” approaches commonly adopted to graft polymer chains on NPs pertaining to nano-dielectrics. The article also covers various surface initiated controlled radical polymerization techniques, along with templated approaches for grafting of polymer chains onto SiO2, TiO2, BaTiO3, and Al2O3 nanomaterials. As a look towards applications, an outlook on high-performance polymer nanocomposite capacitors for the design of high energy density pulsed power thin-film capacitors is also presented.
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Artilia, Ira, Atia Nurul Sidiqa, Zalfa Puspa Fakhira, Myrna Nurlatifah Zakaria, Ahmed El-Ghannam e Arief Cahyanto. "Morphology, Crystal Size and Crystallinity Degree of Silica-Calcium Phosphate Composite (S) and Apatite Cement Formulation - <i>In Vitro</i> Bioactivity Test". Materials Science Forum 1069 (31 agosto 2022): 121–28. http://dx.doi.org/10.4028/p-53nqp6.
Testo completoAbstract (sommario):
Silica-calcium phosphate nanocomposite (SCPC) is a porous bioactive resorbable bioactive ceramics. Incorporating apatite bone cement (AC) formulation of tetracalcium phosphate-dicalcium phosphate dihydrate and SCPC has contributed to the higher mechanical strength of a new prototype apatite cement formulation. This in-vitro experiment aims to investigate the bioactivity of AC formulation using simulated body fluid (SBF). The samples consist of two groups of AC formulations (n=4). The first group, AC with 10% SCPC and the second group AC without SCPC, was immersed in the SBF for 14 days. The samples before and after immersion were analyzed by X-Ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDS), and Scanning Electron Microscope (SEM). The samples' size and degree of crystallinity were analyzed statistically using Shapiro-Wilk, Levene, and Mann-Whitney test. As a result, there was no significant difference in the crystal size and the degree of the crystallinity of both samples. The surface morphology of all samples were coated with hydroxyapatite after immersing in the SBF solution. Both AC formulations with and without SCPC have bioactivity as the bone substitute materials. Combining AC with SCPC50 is a promising method to improve the bioactivity and mechanical strength of calcium phosphate bone cement.
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Qamar, Hina, Adil Saeed, Mohammad Owais, Touseef Hussain, Kashif Hussain, Aziz ur Rahman, Sarfraz Ahmed, Sachin Kumar e Zulfiqar Ahmad Khan. "CuO Bionanocomposite with Enhanced Stability and Antibacterial Activity against Extended-Spectrum Beta-Lactamase Strains". Materials 14, n. 21 (23 ottobre 2021): 6336. http://dx.doi.org/10.3390/ma14216336.
Testo completoAbstract (sommario):
Worldwide, bacterial resistance to beta-lactam antibiotics is the greatest challenge in public health care. To overcome the issue, metal-based nanoparticles were extensively used as an alternative to traditional antibiotics. However, their unstable nature limits their use. In the present study a very simple, environmentally friendly, one-pot synthesis method that avoids the use of organic solvents has been proposed to design stable, novel nanocomposites. Formulation was done by mixing biogenic copper oxide (CuO) nanomaterial with glycerol and phospholipids isolated from egg yolk in an appropriate ratio at optimum conditions. Characterization was done using dynamic light scattering DLS, Zeta potential, high performance liquid chromatography (HPLC), and transmission electron microscopy (TEM). Further, its antibacterial activity was evaluated against the extended-spectrum beta-lactamase strains based on zone of inhibition and minimal inhibitory concentration (MIC) indices. Results from this study have demonstrated the formulation of stable nanocomposites with a zeta potential of 34.9 mV. TEM results indicated clear dispersed particles with an average of 59.3 ± 5 nm size. Furthermore, HPLC analysis of the egg yolk extract exhibits the presence of phospholipids in the sample and has significance in terms of stability. The newly formed nanocomposite has momentous antibacterial activity with MIC 62.5 μg/mL. The results suggest that it could be a good candidate for drug delivery in terms of bactericidal therapeutic applications.
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Allogmani, Ayed S., Roushdy M. Mohamed e Mohamed S. Hasanin. "Green, Eco-Friendly, Highly Biocompatible and Bioactive Nanocomposite-Based Biopolymers Loaded with ZnO@Fe3O4 Nanoparticles". Polymers 15, n. 17 (4 settembre 2023): 3641. http://dx.doi.org/10.3390/polym15173641.
Testo completoAbstract (sommario):
Biocompatibility is a major concern for promising multifunctional bioactive materials. Unfortunately, bioactive materials lack biocompatibility in some respects, so active ingredient formulations are urgently needed. Bimetallic nanoparticles have demonstrated drawbacks in stabilized biocompatible formulations. This study examined the preparation of biomaterial-based multifunctional biopolymers via an eco-friendly formulation method using ultrasound. Bimetallic zinc oxide/iron oxide (magnetic form) nanoparticles (ZnO@Fe3O4NPs) were formulated using casein and starch as capping agents and stabilizers. The formulated nanocomposite was characterized using ultraviolet–visible spectroscopy (UV-vis), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM). Herein, the formulated nanocomposite was shown to have a thermally stable nanostructure, and the bimetallic ZnO@Fe3O4 NPs were measured as 85 nm length and 13 nm width. Additionally, the biocompatibility test showed its excellent cytocompatibility with Wi 38 and Vero normal cell lines, with IC50 550 and 650 mg/mL, respectively. Moreover, the antimicrobial activity was noted against six pathogens that are represent to the most common pathogenic microbes, with the time required for killing of bacteria and unicellular fungi being 19 h and 61 h for filamentous fungi with remarket an excellent antioxidant activity.
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Attia, Adel, Lobna Khorshed, Samir Morsi e Elsayed Ashour. "Corrosion protection of some Cu-based alloys by polyacrylate-alumina nanocomposite coatings". Anti-Corrosion Methods and Materials 69, n. 1 (29 ottobre 2021): 38–46. http://dx.doi.org/10.1108/acmm-03-2021-2464.
Testo completoAbstract (sommario):
Purpose The purpose of this study was to investigate the polyacrylic polymer/Al2O3 as a new nanocomposite coating to protect brass and Al-bronze in 3.5% NaCl and the role of alumina formulation on their protection efficiency Design/methodology/approach The corrosion efficiency of the nanocomposite coating (NCC) was evaluated by open circuit potential and electrochemical impedance spectroscopy (EIS). Findings The protection efficiency was more in the case of Al-bronze even for the same formulation of alumina NCC indicated the Cu substrate contribution. The Cu oxides in alloys and Al2O3 from the NCC and Al-bronze were responsible for this protection. Originality/value All the techniques supported each other, the presence of alumina was responsible for the corrosion protection efficiency.
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Dědková, Kateřina, Marcus Morbach, Jakub Výravský, Kateřina Mamulová Kutláková, Kristina Čabanová, Miroslav Vaculík e Jana Kukutschová. "Nanocomposite Kaolin/TiO2 as a Possible Functional Filler in Automotive Brake Pads". Journal of Nanomaterials 2018 (21 novembre 2018): 1–14. http://dx.doi.org/10.1155/2018/9780894.
Testo completoAbstract (sommario):
An automotive friction brake pad is a complex system consisting of several components with unique and balanced properties related to operation conditions. There are efforts to develop brake pads with longer lifetime and better friction performance and wear properties. Those properties are related to composition of the pads, and therefore, new materials are being evolved. Tuning the friction and wear properties can be achieved with the selection of a functional filler and optimizing its amount in a formulation of friction brake pad. Laboratory-developed and laboratory-prepared nanocomposite material kaolin/TiO2 (KATI) has been introduced to formulation of the commercially available automotive low-steel brake pad. Kaolin was utilized as a matrix for anchoring TiO2 nanoparticles. New unused pads and pads after AK master, a standard dynamometer testing procedure of friction performance, were investigated using light and scanning electron microscopy providing information on the structure and its changes after the friction processes. Moreover, MTK wear test was used to compare wear rate of the newly developed pad with the reference low-steel pad. Improved durability of the brake pad formulation has been observed together with sufficient friction performance. Microscopic analysis shown homogenous distribution of the KATI nanocomposite in the friction layer. From the obtained results, it can be assumed that the new formulation is promising regarding to the life cycle of the pads and reduction of wear rate and thus potential production of wear particulate emissions.
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Arrigo, Rossella, e Giulio Malucelli. "Rheological Behavior of Polymer/Carbon Nanotube Composites: An Overview". Materials 13, n. 12 (18 giugno 2020): 2771. http://dx.doi.org/10.3390/ma13122771.
Testo completoAbstract (sommario):
This paper reviews the current achievements regarding the rheological behavior of polymer-based nanocomposites containing carbon nanotubes (CNTs). These systems have been the subject of a very large number of scientific investigations in the last decades, due to the outstanding characteristics of CNTs that have allowed the formulation of nanostructured polymer-based materials with superior properties. However, the exploitation of the theoretical nanocomposite properties is strictly dependent on the complete dispersion of CNTs within the host matrix and on the consequent development of a huge interfacial region. In this context, a deep knowledge of the rheological behavior of CNT-containing systems is of fundamental importance, since the evaluation of the material’s viscoelastic properties allows the gaining of fundamental information as far as the microstructure of nanofilled polymers is concerned. More specifically, the understanding of the rheological response of polymer/CNT nanocomposites reveals important details about the characteristics of the interface and the extent of interaction between the two components, hence allowing the optimization of the final properties in the resulting nanocomposites. As the literature contains plenty of reviews concerning the rheological behavior of polymer/CNT nanocomposites, this review paper will summarize the most significant thermoplastic matrices in terms of availability and relevant industrial applications.
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Singh, Aishwarya, Khushboo Dasauni, Tapan KumarNailwal e Bhavani Prasad Nenavathu. "Formulation of dual functional gCN/TeO2-ZnO nanocomposites as a controlled release nanofertilizer and antibacterial agent". Nanotechnology 34, n. 15 (30 gennaio 2023): 155602. http://dx.doi.org/10.1088/1361-6528/acb2d1.
Testo completoAbstract (sommario):
Abstract A simple cost-effective sono-chemical method was used for the synthesis of gCN/TeO2-ZnO ternary (2%, 5%, and 10%) nanocomposites, having crystallite size of 12 nm. FE-SEM and transmission electron microscopy images revealed the formation of core–shell type nanocomposites with an average size of 50 nm. Further, E. coli MTCC 443 strain is used as a model organism to study the antibacterial activity of the prepared nanocomposites, using disc diffusion method. Among all the concentrations, 2% gCN/TeO2-ZnO showed maximum zone of inhibition of 23 ± 0.10 mm and its antibacterial activity is like third-generation antibiotic cefotaxime. In addition, the prepared nanocomposites were used as nanofertilizer for the growth of gram seeds Chickpea (Cicer arietinum). The effect of nanocomposite concentration and its sterilising properties are studied on the rate of germination of Chickpea using both in vitro and in vivo studies (pot study). The root length of the gCN/TeO2-ZnO treated plants showed increase in seed germination (3.30 cm) compared to untreated plants (3.22 cm). In addition, enhancement in the shoot length about 28% is noticed in pot studies, compared to control batch samples. The accumulation of nanomaterial in plant roots was confirmed using SEM-EDX and ICP-MS. Finally, a 14-day experiment was conducted to ascertain the role of gCN/TeO2-ZnO in the controlled release of nutrients from the synthesised nanofertilizer. Owing to its excellent water holding capacity, sterilizing properties, and low toxicity this material can be used as a growth promoter in plants.
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Olad, Ali, Hamid Zebhi, Dariush Salari, Abdolreza Mirmohseni e Adel Reyhani Tabar. "Water retention and slow release studies of a salep-based hydrogel nanocomposite reinforced with montmorillonite clay". New Journal of Chemistry 42, n. 4 (2018): 2758–66. http://dx.doi.org/10.1039/c7nj03667a.
Testo completo
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Yin, Xiaoli, Mourad Krifa e Joseph H. Koo. "Flame-Retardant Polyamide 6/Carbon Nanotube Nanofibers: Processing and Characterization". Journal of Engineered Fibers and Fabrics 10, n. 3 (settembre 2015): 155892501501000. http://dx.doi.org/10.1177/155892501501000301.
Testo completoAbstract (sommario):
Polyamide 6 (PA6) was melt-blended with an intumescent flame retardant (FR), multi-wall carbon nanotubes (MWNTs), and nanoclay particles to produce multi-component FR-PA6 nanocomposites. FR-PA6 nanofibers were processed from varied nanocomposite formulations via electrospinning. Electrospinnability, morphology, along with combustion and thermal properties of the nanofibers were investigated. Both the bulk-form nanocomposites and the electrospun nanofiber membranes exhibited significantly improved combustion properties, including both Heat Release Rate and Total Heat Release. On the other hand, thermal stability appeared compromised. With proper FR additive concentrations, synergism between MWNTs and nanoclay was observed.
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Mohd Sharif, Sharifah Norain, Norhayati Hashim, Illyas Md Isa, Suriani Abu Bakar, Mohamad Idris Saidin, Mohamad Syahrizal Ahmad, Mazidah Mamat, Mohd Zobir Hussein e Rahadian Zainul. "Carboxymethyl Cellulose Hydrogel Based Formulations of Zinc Hydroxide Nitrate-Sodium Dodecylsulphate-Bispyribac Nanocomposite: Advancements in Controlled Release Formulation of Herbicide". Journal of Nanoscience and Nanotechnology 21, n. 12 (1 dicembre 2021): 5867–80. http://dx.doi.org/10.1166/jnn.2021.19499.
Testo completoAbstract (sommario):
The usefulness of carboxymethyl cellulose (CMC) as a matrix material in enhancing the controlled release formulations of bispyribac (BP) herbicide from the interlayer gallery of zinc hydroxide nitratesodium dodecylsulphate–bispyribac (ZHN–SDS–BP) nanocomposite was investigated. The CMC coated nanocomposite, ZHN–SDS–BP–CMC was characterised using several instruments for the determination of its physicochemical properties. The release rates of the BP were measured using a UV spectrophotometer, and the aqueous solutions containing PO3−4 , SO2−4 and Cl− were selected as release media in the release studies so as to mimic the real conditions of environmental soil. Significant release time delays, triggered by the gelation forming ability and hygroscopic nature of CMC, were observed in all release media, and the release processes were found to behave in a concentration-dependent manner in all release media. Fitting the release data into several kinetic models demonstrated that release in aqueous solutions of Na3PO4 and Na2SO4 was governed by pseudo second order processes, whereas the release in an aqueous NaCl solution was governed by the parabolic diffusion kinetic model. The potential of CMC in prolonging the release of BP from ZHN–SDS–BP–CMC can potentially help in reducing the pollution resulting from the overuse of pesticides.
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Szunerits, Sabine, e Rabah Boukherroub. "Antibacterial activity of graphene-based materials". Journal of Materials Chemistry B 4, n. 43 (2016): 6892–912. http://dx.doi.org/10.1039/c6tb01647b.
Testo completo
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Loukelis, Konstantinos, Zina A. Helal, Antonios G. Mikos e Maria Chatzinikolaidou. "Nanocomposite Bioprinting for Tissue Engineering Applications". Gels 9, n. 2 (24 gennaio 2023): 103. http://dx.doi.org/10.3390/gels9020103.
Testo completoAbstract (sommario):
Bioprinting aims to provide new avenues for regenerating damaged human tissues through the controlled printing of live cells and biocompatible materials that can function therapeutically. Polymeric hydrogels are commonly investigated ink materials for 3D and 4D bioprinting applications, as they can contain intrinsic properties relative to those of the native tissue extracellular matrix and can be printed to produce scaffolds of hierarchical organization. The incorporation of nanoscale material additives, such as nanoparticles, to the bulk of inks, has allowed for significant tunability of the mechanical, biological, structural, and physicochemical material properties during and after printing. The modulatory and biological effects of nanoparticles as bioink additives can derive from their shape, size, surface chemistry, concentration, and/or material source, making many configurations of nanoparticle additives of high interest to be thoroughly investigated for the improved design of bioactive tissue engineering constructs. This paper aims to review the incorporation of nanoparticles, as well as other nanoscale additive materials, to printable bioinks for tissue engineering applications, specifically bone, cartilage, dental, and cardiovascular tissues. An overview of the various bioinks and their classifications will be discussed with emphasis on cellular and mechanical material interactions, as well the various bioink formulation methodologies for 3D and 4D bioprinting techniques. The current advances and limitations within the field will be highlighted.
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Morawska-Wilk, Alicja, Julia Kensy, Sylwia Kiryk, Agnieszka Kotela, Jan Kiryk, Mateusz Michalak, Natalia Grychowska, Magdalena Fast, Jacek Matys e Maciej Dobrzyński. "Evaluation of Factors Influencing Fluoride Release from Dental Nanocomposite Materials: A Systematic Review". Nanomaterials 15, n. 9 (25 aprile 2025): 651. https://doi.org/10.3390/nano15090651.
Testo completoAbstract (sommario):
This systematic review aims to evaluate factors influencing fluoride release from dental nanocomposite materials. A comprehensive database search was conducted in February 2025 using PubMed, Web of Science, and Scopus. The search terms “fluoride release AND nanocomposites” were applied following PRISMA guidelines. Out of 336 initially identified articles, 17 studies met the inclusion criteria and were selected for analysis. Seventeen studies confirmed that fluoride-releasing nanocomposites are effective, with fluoride ion release influenced by material composition, nanofiller type, and storage conditions. Studies showed that acidic environments (pH 4–5.5) significantly enhanced fluoride release, particularly in materials containing nano-CaF2 or fluoridated hydroxyapatite, which responded to pH changes. Quantitative comparisons revealed that daily fluoride release values ranged from <0.1 μg/cm2/day in commercial composites to greater than 6500 μg/cm2/day in BT-based nanocomposites and up to 416,667 μg/cm2/day in modified GICs. Additionally, some composites exhibited fluoride recharging capabilities, with materials incorporating pyromellitic glycerol dimethacrylate (PMGDM) and ethoxylated bisphenol A dimethacrylate (EBPADMA) demonstrating prolonged fluoride and calcium ion release after recharge exposure, rather than the highest initial values. Despite releasing lower fluoride levels than conventional GIC and RMGI materials, fluoride-releasing nanocomposites demonstrate significant anti-caries potential and clinical applicability, with some formulations supporting periodontal regeneration and caries prevention around orthodontic brackets. However, the lack of consistency in study protocols—including differences in storage media, sample geometry, and measurement methods—limits direct comparison of outcomes. Therefore, the most critical direction for future research is the development of standardized testing protocols to ensure reliable, comparable results across material groups.
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Feng, Zuying, Yan Li, Liang Hao, Yihu Yang, Tian Tang, Danna Tang e Wei Xiong. "Graphene-Reinforced Biodegradable Resin Composites for Stereolithographic 3D Printing of Bone Structure Scaffolds". Journal of Nanomaterials 2019 (11 aprile 2019): 1–13. http://dx.doi.org/10.1155/2019/9710264.
Testo completoAbstract (sommario):
A biodegradable UV-cured resin has been fabricated via stereolithography apparatus (SLA). The formulation consists of a commercial polyurethane resin as an oligomer, trimethylolpropane trimethacrylate (TEGDMA) as a reactive diluent and phenylbis (2, 4, 6-trimethylbenzoyl)-phosphine oxide (Irgacure 819) as a photoinitiator. The tensile strength of the three-dimensional (3D) printed specimens is 68 MPa, 62% higher than that of the reference specimens (produced by direct casting). The flexural strength and modulus can reach 115 MPa and 5.8 GPa, respectively. A solvent-free method is applied to fabricate graphene-reinforced nanocomposite. Porous bone structures (a jawbone with a square architecture and a sternum with a round architecture) and gyroid scaffold of graphene-reinforced nanocomposite for bone tissue engineering have been 3D printed via SLA. The UV-crosslinkable graphene-reinforced biodegradable nanocomposite using SLA 3D printing technology can potentially remove important cost barriers for personalized biological tissue engineering as compared to the traditional mould-based multistep methods.
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Ghosh, S., R. A. Sengupta e G. Heinrich. "Investigations on Rolling Resistance of Nanocomposite Based Passenger Car Radial Tyre Tread Compounds Using Simulation Technique". Tire Science and Technology 39, n. 3 (1 settembre 2011): 210–22. http://dx.doi.org/10.2346/1.3637744.
Testo completoAbstract (sommario):
Abstract Tyre rolling resistance is a key performance index in the tyre industry that addresses the environmental concern. Reduction of tyre rolling resistance is a major challenge so as to lower the fuel consumption, which could be achieved by changing both design as well as compound formulation. In this paper, rolling resistance of 205/60R15 as well as 155/70R14 passenger car radial tyre with nanocomposite based tread compounds were evaluated using finite element (FE) analysis. The energy dissipation in the tyre was evaluated using the product of elastic strain energy and the loss tangent of materials through post processing using a rolling resistance code. The elastic strain energy was obtained through steady state rolling simulation of tyre using Abaqus software and the loss tangent was measured in the laboratory by viscoanalyzer. A good correlation of rolling resistance was observed between simulation and experimental results. Nanocomposites used in this study were prepared based on solution styrene butadiene rubber and polybutadiene rubber blends with either organoclay and carbon black or organoclay and silica dual fillers. Carboxylated nitrile rubber, a polar rubber, was used as compatibilizer to facilitate the clay dispersion in rubber matrix. Compared to general carbon black or silica tread compounds, substantial improvement of rolling resistance was predicted by FE simulation with nanocomposite based tread compounds containing dual fillers organoclay-carbon black or organoclay-silica.
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Figovsky, Oleg. "New Methods of Preparing Multi-Functional Nanocomposite Coatings". Advanced Materials Research 79-82 (agosto 2009): 1979–82. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1979.
Testo completoAbstract (sommario):
Nanostructured coatings based on interpenetrated polymer network of polyurethanes, polyacrylates or epoxide resins and containing nanoparticles of SiO2, TiO2 and other metal oxides introduced into a polymeric matrix was elaborated. Technology of the unique coatings provides control of their micro-and nano-structures. Formulation of a new class of nanocomposite materials is characterized by the absence of contaminants in the polymers technology [1]. The main components of the technology are branched (dendro)-aminosilanes which serve as curing agents for many oligomers. Additional hydrolysis of aminosilane oligomers creates the secondary nano-structured network polymer that improves performance of the compound.
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Villalba-Rodríguez, Angel M., Sara Martínez-González, Juan Eduardo Sosa-Hernández, Roberto Parra-Saldívar, Muhammad Bilal e Hafiz M. N. Iqbal. "Nanoclay/Polymer-Based Hydrogels and Enzyme-Loaded Nanostructures for Wound Healing Applications". Gels 7, n. 2 (14 maggio 2021): 59. http://dx.doi.org/10.3390/gels7020059.
Testo completoAbstract (sommario):
Multi-polymeric nanocomposite hydrogels with multi-functional characteristics have been engineered with high interest around the globe. The ease in fine tunability with maintained compliance makes an array of nanocomposite biomaterials outstanding candidates for the biomedical sector of the modern world. In this context, the present work intends to tackle the necessity of alternatives for the treatment of diabetic foot ulcers through the formulation of nanoclay and/or polymer-based nanocomposite hydrogels. Laponite RD, a synthetic 2-D nanoclay that becomes inert when in a physiological environment, while mixed with water, becomes a clear gel with interesting shear-thinning properties. Adding Laponite RD to chitosan or gelatin allows for the modification of the mechanical properties of such materials. The setup explored in this research allows for a promising polymeric matrix that can potentially be loaded with active compounds for antibacterial support in foot ulcers, as well as enzymes for wound debridement.
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Zeverdejani, Mehran Karimi, e Yaghoub Tadi Beni. "Size-dependent vibration analysis of graphene-PMMA lamina based on non-classical continuum theory". Science and Engineering of Composite Materials 26, n. 1 (28 gennaio 2019): 491–501. http://dx.doi.org/10.1515/secm-2019-0033.
Testo completoAbstract (sommario):
AbstractThis paper studies the free vibration of polymer nanocomposite reinforced by graphene sheet. In this work, the new size dependent formulation is presented for nanocomposites based on couple stress theory. For this purpose, the first shear deformation theory is applied. The effect of scale parameter is investigated based on anisotropic couple stress theory. Vibration equations of the composite lamina are extracted using Hamilton’s principle. Numerical results are provided for Poly methyl methacrylate/graphene composite.Mechanical properties of the composite are obtained from molecular dynamics simulation. Based on eigenvalue procedure, an analytical solution is obtained for the natural frequency of composite lamina. In the results section, the effect of dimensional and physical parameters are investigated on lamina natural frequency. It is observed that graphene defects caused to diminish the lamina frequency. Furthermore, it is revealed that the increase in graphene volume fraction leads to natural frequency be greater.
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Wu, Hao, Rogelio Ortiz, Renan De Azevedo Correa, Mourad Krifa e Joseph H. Koo. "Self-Extinguishing and Non-Drip Flame Retardant Polyamide 6 Nanocomposite: Mechanical, Thermal, and Combustion Behavior". Flame Retardancy and Thermal Stability of Materials 1, n. 1 (20 gennaio 2018): 1–13. http://dx.doi.org/10.1515/flret-2018-0001.
Testo completoAbstract (sommario):
AbstractIncorporation of flame-retardant (FR) additives and nanoclay fillers into thermoplastic polymers effectively suppresses materials flammability and melt dripping behavior. However, it largely affects other properties, such as toughness and ductility. In order to recover the lost toughness and ductility of flame retardant polyamide 6, various loadings of maleic anhydride modified SEBS elastomer were added and processed by twin screw extrusion. TEM images showed exfoliated nanoclay platelets and reveals that the clay platelets well dispersed in the polymer matrix. By balancing the ratio of flame retardants, nanoclay and elastomers, formulation with elongation at break as high as 76% was achieved. Combining conventional intumescent FR and nanoclay, UL-94 V-0 rating and the LOI value as high as 32.2 were achieved. In conclusion, effective self-extinguishing and non-drip polyamide 6 nanocomposite formulations with significant improvement in toughness and ductility were achieved.