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Articoli di riviste sul tema "Formulation de Matériaux Nanocomposites"

Autore: Grafiati
Pubblicato: 10 maggio 2025

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1

Ton-That, M. T., F. Perrin-Sarazin, K. C. Cole, M. N. Bureau e J. Denault. "Polyolefin nanocomposites: Formulation and development". Polymer Engineering and Science 44, n. 7 (2004): 1212–19. http://dx.doi.org/10.1002/pen.20116.

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Oualit, Mehena, Amar Irekti e Arezki Sarri. "Influence des conditions de durcissement et le taux d’alcalins sur les performances mécaniques des matériaux alcali-activés à base du laitier de haut fourneau". Matériaux & Techniques 110, n. 2 (2022): 202. http://dx.doi.org/10.1051/mattech/2022017.

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Dans un monde qui s’oriente davantage vers le développement durable, les matériaux alcali-activés (MAA) sont identifiés comme étant une alternative aux matériaux à base cimentaire, connus pour leur forte émission de CO2 lors de leur fabrication. Bien que des efforts soient fournis pour minimiser cet impact négatif sur l’environnement par l’utilisation de sous-produits industriels lors de la fabrication du ciment Portland ou par substitution partielle du ciment dans la formulation du béton, le crédit carbone reste toutefois élevé. La présente étude vise à évaluer les propriétés mécaniques d’un matériau alcali-activé à base du laitier granulé de haut fourneau. L’activation alcaline a été réalisée par deux types d’activants à savoir une solution aqueuse de silicate de sodium et une solution d’hydroxyde de sodium à différentes concentrations molaires. Les résultats ont montré que le taux d’alcalin contenu dans l’activant ainsi que les conditions de durcissement des échantillons influe significativement sur les performances mécaniques des matériaux alcali-activés élaborés. La valeur de la résistance à la compression la plus élevée est estimée à 117 MPa, enregistrée à 28 jours de durcissement sous conditions contrôlées (humidité = 50 % ; T° = 20 °C), et ce, en utilisant un taux de silicate alcalin égal à 6 (exprimé en pourcentage de Na2O par rapport au précurseur).
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Oualit, Mehena, Amar Irekti e Arezki Sarri. "Influence des conditions de durcissement et le taux d’alcalins sur les performances mécaniques des matériaux alcali-activés à base du laitier de haut fourneau". Matériaux & Techniques 110, n. 2 (2022): 202. http://dx.doi.org/10.1051/mattech/2022017.

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Abstract (sommario):
Dans un monde qui s’oriente davantage vers le développement durable, les matériaux alcali-activés (MAA) sont identifiés comme étant une alternative aux matériaux à base cimentaire, connus pour leur forte émission de CO2 lors de leur fabrication. Bien que des efforts soient fournis pour minimiser cet impact négatif sur l’environnement par l’utilisation de sous-produits industriels lors de la fabrication du ciment Portland ou par substitution partielle du ciment dans la formulation du béton, le crédit carbone reste toutefois élevé. La présente étude vise à évaluer les propriétés mécaniques d’un matériau alcali-activé à base du laitier granulé de haut fourneau. L’activation alcaline a été réalisée par deux types d’activants à savoir une solution aqueuse de silicate de sodium et une solution d’hydroxyde de sodium à différentes concentrations molaires. Les résultats ont montré que le taux d’alcalin contenu dans l’activant ainsi que les conditions de durcissement des échantillons influe significativement sur les performances mécaniques des matériaux alcali-activés élaborés. La valeur de la résistance à la compression la plus élevée est estimée à 117 MPa, enregistrée à 28 jours de durcissement sous conditions contrôlées (humidité = 50 % ; T° = 20 °C), et ce, en utilisant un taux de silicate alcalin égal à 6 (exprimé en pourcentage de Na2O par rapport au précurseur).
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Momeni, K., e R. S. Yassar. "Analytical Formulation of Stress Distribution in Cellulose Nanocomposites". Journal of Computational and Theoretical Nanoscience 6, n. 7 (1 luglio 2009): 1511–18. http://dx.doi.org/10.1166/jctn.2009.1203.

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Allamel-Raffin, Catherine. "Le texte et l'image dans la formulation de la preuve en physique des matériaux". Revue d'anthropologie des connaissances Vol 4, 3, n. 3 (2010): 476. http://dx.doi.org/10.3917/rac.011.0476.

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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.

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Abstract (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.

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Abstract (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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Sahebi Jouibari, Iman, Vahid Haddadi-Asl e Mohammad Masoud Mirhosseini. "Formulation of micro-phase separation kinetics of polyurethane nanocomposites". Polymers for Advanced Technologies 29, n. 12 (19 luglio 2018): 2909–16. http://dx.doi.org/10.1002/pat.4410.

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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.

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Azani, Mohammad-Reza, e Azin Hassanpour. "UV-Curable Polymer Nanocomposites: Material Selection, Formulations, and Recent Advances". Journal of Composites Science 8, n. 11 (25 ottobre 2024): 441. http://dx.doi.org/10.3390/jcs8110441.

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This study addresses the development of UV-curable polymer nanocomposites (PNCs), mainly based on acrylate, emphasizing material selection and formulation strategies that achieve efficient dispersion of the nanofillers (NFs). We begin by exploring various types of UV-curing coatings and delve deeper into their key components: monomers, oligomers, photoinitiators, fillers, and additives. Different types of components and examples are presented. Furthermore, this study delves into the critical importance of modifying NFs to tune the physical properties of the composite. It provides an overview of commonly used NFs and underscores the importance of surface modification (chemical and physical) as a pivotal technique for producing high-performance UV-curable PNCs. Additionally, various additives such as adhesion promoters, anti-foaming agents, and wetting and dispersing agents are discussed, emphasizing their functions within the formulation process. Different dispersion and blending methods are also discussed. The paper concludes by summarizing and presenting recent advancements in the formulation of UV-curable PNCs. This overview offers valuable insights to researchers and engineers working on the development of advanced materials.
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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.

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12

Belgasmi, I., e M. Hamimid. "Accurate Hysteresis Loops Calculation Under the Frequency Effect Using the Inverse Jiles-Atherton Model". Advanced Electromagnetics 9, n. 2 (12 novembre 2020): 93–98. http://dx.doi.org/10.7716/aem.v9i2.1515.

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Dans ce présent travail, une tentative a été faite pour améliorer la forme des boucles d'hystérésis ainsi qu'un calcul précis des pertes de fer sous l'effet de fréquence. Le modèle inverse de Jiles-Atherton est étendu pour décrire l'aimantation du comportement des matériaux ferromagnétiques en régime dynamique. Une nouvelle formulation du champ magnétique efficace est utilisée qui consiste à modifier l'expression du champ excédentaire pour prendre correctement en compte l'effet des parois du domaine mobile. La nouvelle expression proposée du champ effectif permet une bonne représentation du comportement d'hystérésis magnétique vis-à-vis de l'augmentation de fréquence. Pour valider cette proposition, on compare des boucles d'hystérésis mesurées et modélisées pour différentes fréquences.
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Schipperges, Alessa, Yong Hu, Svenja Moench, Simone Weigel, Johannes Reith, Diana Ordoñez-Rueda, Kersten S. Rabe e Christof M. Niemeyer. "Formulation of DNA Nanocomposites: Towards Functional Materials for Protein Expression". Polymers 13, n. 15 (21 luglio 2021): 2395. http://dx.doi.org/10.3390/polym13152395.

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DNA hydrogels are an emerging class of materials that hold great promise for numerous biotechnological applications, ranging from tissue engineering to targeted drug delivery and cell-free protein synthesis (CFPS). In addition to the molecular programmability of DNA that can be used to instruct biological systems, the formulation of DNA materials, e.g., as bulk hydrogels or microgels, is also relevant for specific applications. To advance the state of knowledge in this research area, the present work explores the scope of a recently developed class of complex DNA nanocomposites, synthesized by RCA polymerization of DNA-functionalized silica nanoparticles (SiNPs) and carbon nanotubes (CNTs). SiNP/CNT–DNA composites were produced as bulk materials and microgels which contained a plasmid with transcribable genetic information for a fluorescent marker protein. Using confocal microscopy and flow cytometry, we found that the materials are very efficiently taken up by various eukaryotic cell lines, which were able to continue dividing while the ingested material was evenly distributed to the daughter cells. However, no expression of the encoded protein occurred within the cells. While the microgels did not induce production of the marker protein even in a CFPS procedure with eukaryotic cell lysate, the bulk composites proved to be efficient templates for CFPS. This work contributes to the understanding of the molecular interactions between DNA composites and the functional cellular machinery. Implications for the use of such materials for CFPS procedures are discussed.
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Maxit, Benoît, Denis Bendejacq e Virginie Ponsinet. "Facile formulation of high density well-ordered nanoparticle–copolymer nanocomposites". Soft Matter 8, n. 5 (2012): 1317–20. http://dx.doi.org/10.1039/c2sm06987c.

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Minnich, Austin, e Gang Chen. "Modified effective medium formulation for the thermal conductivity of nanocomposites". Applied Physics Letters 91, n. 7 (13 agosto 2007): 073105. http://dx.doi.org/10.1063/1.2771040.

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16

Yong, Virginia, e H. Thomas Hahn. "Monodisperse SiC/vinyl ester nanocomposites: Dispersant formulation, synthesis, and characterization". Journal of Materials Research 24, n. 4 (aprile 2009): 1553–58. http://dx.doi.org/10.1557/jmr.2009.0176.

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A novel dispersant “mono-2-(methacryloyloxy)ethyl succinate” was formulated for dispersing 30-nm SiC nanoparticles in vinyl ester resin. The eight carbon rule was used as the guideline to achieve a particle–particle separation of 20 to 60 nm for colloid stability. Fourier transform infrared spectroscopy was performed to characterize the SiC particle surfaces. Only a negligible amount of oxidized layer was observed; which illustrates that the SiC surface is basic. Thus, the Lewis base-Lewis acid reactions make the functional group –COOH an effective adsorbate to the SiC nanoparticle surface. The organofunctional group “methacrylates,” which exhibits the best wet strength with polyester copolymerizes with styrene monomers in the vinyl ester during cure. Hence, this novel dispersant also acts as an efficient coupling agent that reacts with both SiC and vinyl ester. The monolayer coverage dosage of 62 fractional wt% of the dispersant was used to attain the minimum filled resin viscosity. The multicomponent compositional imaging using atomic force microscopy confirmed the monodisperse SiC nanoparticles in vinyl ester. The 3 vol% SiC reinforced vinyl ester achieved a 75% increase in modulus, 42% increase in strength, and 75% increase in toughness as compared with the neat resin without nanofiller reinforcement.
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Shaya, Mahmoudian, Uzir Wahit Mat, A. A. Yussuf e Nematzadeh Navid. "Preparation and Thermal Properties of Cellulose/Layered Silicate Montmorillonite Nanocomposites Prepared via Ionic Liquids". Key Engineering Materials 471-472 (febbraio 2011): 786–91. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.786.

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Environmentally friendly nanocomposites comprising of cellulose and montmorillonite (MMT) were prepared via a green solvent, ionic liquid, 1-butyl-3-methylimidazolium chloride (BMIMCl) using solution casting method. The cellulose concentration and MMT content were varied according to predetermine formulation. The regenerated cellulose nanocomposites were characterized using X-ray diffraction (XRD). The thermal and thermal oxidative properties of regenerated cellulose nanocomposites were studied by thermogravimetric analysis (TGA). Mechanical properties of the nanocomposites films were investigated by tensile strength measurements. The intercalation and exfoliation of MMT in the cellulose matrix were confirmed by XRD results. TGA results showed an increment in degradation temperature and char yield for the nanocomposites. Multistep TGA graph was observed for degradation under air. The results indicated that the addition of MMT up to 6 wt% in regenerated cellulose matrix improved the tensile properties.
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El Maghri, Sanaa, Samia Yousfi, Hicham Essallaki e Mouna Latifa Bouamrani. "Étude de l’effet de l’ajout des déchets de marbre sur les propriétés du béton à base de granulats de briques recyclés (GBR)". Matériaux & Techniques 110, n. 5 (2022): 502. http://dx.doi.org/10.1051/mattech/2022032.

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Le présent travail vise à valoriser les déchets issus de l’industrie des matériaux de construction à savoir les débris des briques en terre cuite des briqueteries et les déchets de marbre. Pour atteindre cet objectif de valorisation des déchets inertes, non dangereux issus de l’industrie des matériaux de construction, il est impératif de développer des systèmes de recyclage de ces déchets. C’est dans cette optique que nous proposons, dans ce travail, de recycler les déchets de briques en terre cuite ainsi que les déchets de marbre. Il s’agit d’une étude expérimentale où différentes formulations des bétons ont été préparées à partir d’une formulation de référence avec des granulats naturels. Une substitution partielle avec des taux de 20 %, 40 %, 60 % jusqu’à une substitution totale de 100 % a été réalisée. Les bétons ainsi fabriqués ont été caractérisés afin d’évaluer leurs performances en comparaison avec celles du béton de référence. Les résultats de cette étude ont prouvé que les meilleures performances du béton sont obtenues pour un taux de 20 % et 40 % de substitution. Ces résultats ont été améliorés par l’ajout des déchets de marbre sous forme de poudre, avec différents taux (5 %, 10 % et 15 %). La qualité des bétons ainsi fabriqués a été améliorée. Ainsi, ces granulats recyclés peuvent être employés à la place de granulats naturels dans de nouvelles constructions en suivant la norme EN 206 qui réglemente leur utilisation selon leurs caractéristiques et la classe d’exposition des ouvrages construits.
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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.

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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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Phanapavudhikul, Ponpan, Shoucang Shen, Wai Kiong Ng e Reginald B. H. Tan. "Formulation of Fe3O4/Acrylate Co-Polymer Nanocomposites as Potential Drug Carriers". Drug Delivery 15, n. 3 (gennaio 2008): 177–83. http://dx.doi.org/10.1080/10717540801952597.

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Reams, Josiah T., Andrew J. Guenthner, Kevin R. Lamison, Gregory R. Yandek, David D. Swanson e Joseph M. Mabry. "Formulation and physical properties of cyanate ester nanocomposites based on graphene". Journal of Polymer Science Part B: Polymer Physics 52, n. 16 (18 giugno 2014): 1061–70. http://dx.doi.org/10.1002/polb.23532.

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Trinh, Giang Hoang, Marlène Desloir, Fabien Dutertre, Jean-Charles Majesté, Florent Dalmas e Guilhem P. Baeza. "Isostructural softening of the filler network in SBR/silica nanocomposites". Soft Matter 15, n. 15 (2019): 3122–32. http://dx.doi.org/10.1039/c8sm02592d.

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A new formulation of the widely used nanocomposites based on SBR (ca. 250 kg mol−1) and fractal silica fillers is proposed by substituting the usual covering and coupling agents with short chains (4 kg mol−1) of polypropylene glycol (PPG).
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Cristol, Anne-Lise, Mouna Baklouti, Nesrine Hentati, Yannick Desplanques, Riadh Elleuch, Denis Najjar e Mohamed Kchaou. "Matériaux de friction : formulation simplifiée pour la compréhension du rôle des constituants et de l'impact du procédé d'élaboration". MATEC Web of Conferences 7 (2013): 01021. http://dx.doi.org/10.1051/matecconf/20130701021.

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Katbab, Pouya, Maryam Alizadeh, Babak Kaffashi e Ali Asghar Katbab. "Bionanocomposites with enhanced antimicrobial activity and photodegradability based on low density polyethylene and nano TiO2/organoclay". e-Polymers 14, n. 1 (1 gennaio 2014): 43–55. http://dx.doi.org/10.1515/epoly-2013-0009.

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AbstractBionanocomposite materials with enhanced photodegradability and bactericidal activity, as well as improved gas barrier properties, were manufactured by incorporating silicate nanolayers into the structure of low density polyethylene (LDPE) filled with nano titanium dioxide (TiO2) via melt compounding. Effects of interfacial compatibilization upon developed microstructure were studied by incorporating maleated LDPE into the nanocomposites formulation. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and rheo-mechanical spectroscopy (RMS) techniques were conducted to characterize the microstructure of the nanocomposites. Interfacially compatibilized TiO2/organoclay (OC) based nanocomposites exhibited shorter induction time for the onset of photodegradation, and an acceptable inactivation of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) microbe cells upon UV light irradiation, indicating enhanced photoactivity of the hybridized TiO2/OC nanosystem. TiO2/OC-based nanocomposites exhibited increased melt viscosity and pseudo solid like characteristics in melt linear viscoelastic behavior. Moreover, TiO2/OC-based nanocomposites presented improved barrier properties, which make such materials applicable for packaging applications.
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Hidayah, Nurul, Mariatti Mustapha, Hanafi Ismail e Mohamad Kamarol. "Linear low-density polyethylene/silicone rubber nanocomposites". Journal of Elastomers & Plastics 50, n. 1 (20 aprile 2017): 36–57. http://dx.doi.org/10.1177/0095244317704983.

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This study determines the applicability of nanofillers (silica, boron nitride, and zinc oxide) in linear low-density polyethylene (LLDPE)/silicone rubber (SR) insulation compounds. Design of experiment is adopted to model the relationship between the properties (permittivity, loss tangent, dielectric strength, and volume resistivity) and factors (SR content, type of nanofiller, and nanofiller loading) for performance optimization. It is observed that SR content and type of nanofiller significantly influence the electrical properties of LLDPE/SR nanocomposites. Nanofiller loading, however, causes a small variation in the properties of the nanocomposites except for dielectric strength. From the optimization, it is found that the optimum formulation composition is 10 wt% of SR and 2 vol% of nanoboron nitride.
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Sabbagh, Hazem Abdul Kader, Samer Hasan Hussein-Al-Ali, Mohd Zobir Hussein, Zead Abudayeh, Rami Ayoub e Suha Mujahed Abudoleh. "A Statistical Study on the Development of Metronidazole-Chitosan-Alginate Nanocomposite Formulation Using the Full Factorial Design". Polymers 12, n. 4 (1 aprile 2020): 772. http://dx.doi.org/10.3390/polym12040772.

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The goal of this study was to develop and statistically optimize the metronidazole (MET), chitosan (CS) and alginate (Alg) nanoparticles (NP) nanocomposites (MET-CS-AlgNPs) using a (21 × 31 × 21) × 3 = 36 full factorial design (FFD) to investigate the effect of chitosan and alginate polymer concentrations and calcium chloride (CaCl2) concentration ondrug loading efficiency(LE), particle size and zeta potential. The concentration of CS, Alg and CaCl2 were taken as independent variables, while drug loading, particle size and zeta potential were taken as dependent variables. The study showed that the loading efficiency and particle size depend on the CS, Alg and CaCl2 concentrations, whereas zeta potential depends only on the Alg and CaCl2 concentrations. The MET-CS-AlgNPs nanocomposites were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM) and in vitro drug release studies. XRD datashowed that the crystalline properties of MET changed to an amorphous-like pattern when the nanocomposites were formed.The XRD pattern of MET-CS-AlgNPs showed reflections at 2θ = 14.2° and 22.1°, indicating that the formation of the nanocompositesprepared at the optimum conditions havea mean diameter of (165±20) nm, with a MET loading of (46.0 ± 2.1)% and a zeta potential of (−9.2 ± 0.5) mV.The FTIR data of MET-CS-AlgNPs showed some bands of MET, such as 3283, 1585 and 1413 cm−1, confirming the presence of the drug in the MET-CS-AlgNPs nanocomposites. The TGA for the optimized sample of MET-CS-AlgNPs showed a 70.2% weight loss compared to 55.3% for CS-AlgNPs, and the difference is due to the incorporation of MET in the CS-AlgNPs for the formation of MET-CS-AlgNPs nanocomposites. The release of MET from the nanocomposite showed sustained-release properties, indicating the presence of an interaction between MET and the polymer. The nanocomposite shows a smooth surface and spherical shape. The release profile of MET from its MET-CS-AlgNPs nanocomposites was found to be governed by the second kinetic model (R2 between 0.956–0.990) with more than 90% release during the first 50 h, which suggests that the release of the MET drug can be extended or prolonged via the nanocomposite formulation.
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Saifullah, Bullo, Palanisamy Arulselvan, Mohamed Ezzat El Zowalaty, Sharida Fakurazi, Thomas J. Webster, Benjamin Geilich e Mohd Zobir Hussein. "Development of a Highly Biocompatible Antituberculosis Nanodelivery Formulation Based on Para-Aminosalicylic Acid—Zinc Layered Hydroxide Nanocomposites". Scientific World Journal 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/401460.

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Abstract (sommario):
Tuberculosis is a lethal epidemic, difficult to control disease, claiming thousands of lives every year. We have developed a nanodelivery formulation based on para-aminosalicylic acid (PAS) and zinc layered hydroxide using zinc nitrate salt as a precursor. The developed formulation has a fourfold higher efficacy of PAS against mycobacterium tuberculosis with a minimum inhibitory concentration (MIC) found to be at 1.40 μg/mL compared to the free drug PAS with a MIC of 5.0 μg/mL. The newly developed formulation was also found active against Gram-positive bacteria, Gram-negative bacteria, andCandida albicans. The formulation was also found to be biocompatible with human normal lung cells MRC-5 and mouse fibroblast cells-3T3. Thein vitrorelease of PAS from the formulation was found to be sustained in a human body simulated phosphate buffer saline (PBS) solution at pH values of 7.4 and 4.8. Most importantly the nanocomposite prepared using zinc nitrate salt was advantageous in terms of yield and free from toxic zinc oxide contamination and had higher biocompatibility compared to one prepared using a zinc oxide precursor. In summary, these promisingin vitroresults are highly encouraging for the continued investigation of para-aminosalicylic acid and zinc layered hydroxide nanocompositesin vivoand eventual preclinical studies.
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Nabipour, Hafezeh, Moayad Hossaini Sadr e Nygil Thomas. "Synthesis, controlled release and antibacterial studies of nalidixic acid–zinc hydroxide nitrate nanocomposites". New Journal of Chemistry 40, n. 1 (2016): 238–44. http://dx.doi.org/10.1039/c5nj01737h.

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29

Pore, Yogesh, Madhuri Mane, Vaishnavi Mangrule, Atul Chopade e Pankaj Gajare. "PREPARATION, CHARACTERIZATION, AND EVALUATION OF ANTI-INFLAMMATORY ACTIVITY OF ETORICOXIB LOADED SOLUPLUS® NANOCOMPOSITES". International Journal of Applied Pharmaceutics 10, n. 6 (22 novembre 2018): 268. http://dx.doi.org/10.22159/ijap.2018v10i6.26042.

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Abstract (sommario):
Objective: The objective of this study was to prepare and characterize etoricoxib (ECB) loaded Soluplus® nanocomposites to improve its physicochemical properties. The effect of polymer and surfactant concentration on particle size, in vitro percentage dissolution efficiency and the anti-inflammatory activity of nanocomposites were also investigated.Methods: The nanocomposites were prepared by using a freeze-drying technique. The analytical evidence for the formulation of lyophilized nanocomposites in solid state were generated and confirmed by differential scanning calorimetry (DSC), fourier transformation infrared spectroscopy (FTIR), x-ray powder diffractometry (XPRD) and scanning electron microscopy (SEM). The in vitro drug release profile of nanocomposites was compared with pure ECB powder.Results: The nanocomposites of ECB were contained in a nano range with particle size and zeta potential of 63.5 nm and 46.5 mv, respectively. The solubility and dissolution of the nanocomposites were significantly (p<0.001) improved as compared to ECB alone, evidenced by decreased log P values (1.90±0.002) of the nanocomposites. The characterization studies revealed the formation of amorphous nanocomposites of ECB with existence of physical interactions between drug and polymer. The anti-inflammatory activity of nanocomposites evaluated by carrageenan-induced rat paw edema model demonstrated nonsignificant (p>0.05) increase in anti-inflammatory activity as compared to pure ECB.Conclusion: From the results, it could be concluded that the formation of ECB nanocomposites with Soluplus® could be an effective and alternative approach to modify the physicochemical properties of ECB.
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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.

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Abstract (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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Helson, Olivier, Javad Eslami, Anne-Lise Beaucour, Albert Noumowe e Philippe Gotteland. "Étude parametrique de matériaux modèles : aide au dimensionnement des ouvrages souterrains issus de mélanges sol-ciment". Revue Française de Géotechnique, n. 162 (2020): 2. http://dx.doi.org/10.1051/geotech/2020004.

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Abstract (sommario):
Le Deep Soil Mixing est une technique d’amélioration de sols dont la part de marché devient non négligeable. Les progrès technologiques dans le domaine permettent aujourd’hui d’envisager la réalisation d’ouvrages permanents. L’utilisation structurelle du matériau sol-ciment n’est cependant pas encore réglementée comme le béton avec l’Eurocode 2, ni validée par un nombre suffisant d’études de durabilité. Ces problématiques ont donc fait l’objet d’un travail de recherche au sein du laboratoire de mécanique et matériaux du génie civil (L2MGC) avec le soutien de la Fédération Nationale des Travaux Publics (FNTP) et de l’entreprise « Spie Fondations ». Cet article présente de manière synthétique le résultat des travaux expérimentaux qui ont été conduits afin de mieux comprendre l’influence des paramètres de formulation et des conditions d’exposition sur le comportement du matériau. L’étude met tout d’abord en évidence le lien entre la conductivité hydraulique du matériau et le diamètre caractéristique des pores. Des relations mathématiques sont ensuite proposées afin d’estimer les propriétés mécaniques du matériau. Puis, les propriétés résiduelles du matériau sont analysées en situation de vieillissement accéléré et à haute température.
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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.

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Abstract (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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Almahamid, Yousef Rezek, Samer Hasan Hussein-Al-Ali e Mike Kh Haddad. "Application of Factorial Design and Response Surface Methodology in the Optimization of Clindamycin Nanocomposites". Journal of Nanomaterials 2022 (31 agosto 2022): 1–19. http://dx.doi.org/10.1155/2022/1967606.

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Abstract (sommario):
This study is aimed at achieving the optimized preparation of a new extended-release formulation of clindamycin (CLD) via loading of the CLD onto chitosan-chondroitin sulfate (CS-Chondro). The CS-Chondro-CLD nanocomposites were prepared by mixing different masses of CS (50, 100, and 200 mg) with Chondro (50, 100, and 200 mg) and different masses of CLD (75, 150, and 300 mg). The prepared nanocomposites were characterized by different techniques including loading efficiency (LE), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and release study. The XRD spectra of CS-Chondro-CLD nanocomposites showed two peaks at 2 θ = 22.5 ° and 40.7°, indicating amorphous forms. The FTIR data shows incorporation of CLD into the CS-Chondro polymers. An in vitro release study of CLD from nanocomposites was carried out using PBS at pH 7.4. The result showed that the release rate was completed after 25 hours. This study showed that the CS-Chondro-CLD nanocomposites have promising applications in the delivery of CLD drug.
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Chen, Xinyu, Irene J. Beyerlein e L. Catherine Brinson. "Curved-fiber pull-out model for nanocomposites. Part 1: Bonded stage formulation". Mechanics of Materials 41, n. 3 (marzo 2009): 279–92. http://dx.doi.org/10.1016/j.mechmat.2008.12.004.

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35

Rihayat, Teuku, Saari B. Mustapa, Mohd Hilmi B. Mahmood, Wan MD Zin Wan Yunus, Suraya Abdul Rashid e Khairul Zaman B. Hj. Mohd. Dahlan. "STUDY ON FORMULATION OF POLYURETHANE/CLAY NANOCOMPOSITES BASED ON PALM OIL POLYOL". Jurnal Sains dan Teknologi Reaksi 22, n. 01 (14 giugno 2024): 91. https://doi.org/10.30811/jstr.v22i01.6334.

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36

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.

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Abstract (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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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.

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Abstract (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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Shen, Yudong, Xingya Li e Yuan Le. "Amorphous Nanoparticulate Formulation of Sirolimus and Its Tablets". Pharmaceutics 10, n. 3 (11 settembre 2018): 155. http://dx.doi.org/10.3390/pharmaceutics10030155.

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Abstract (sommario):
Nanocrystallization and amorphization have proven to be two effective strategies to improve the bioavailability of water-insoluble drugs. The purpose of our work was to develop a nano-formulated tablet of sirolimus (SRL) for enhanced dissolution. Amorphous SRL nanocomposites were prepared using anti-solvent precipitation via a high-gravity rotating packed bed. Various factors that affect particle size and size distribution, such as excipients, rotating speed, antisolvent/solvent flow rate, were investigated. Structure, stability and in vitro dissolution of the as-prepared SRL were evaluated. Furthermore, the nanoparticulated SRL tablet formula was screened to control drug release. Importantly, SRL tablets exhibit different dissolution profile by adjusting HPMC (hydroxypropyl methyl cellulose) content, which makes them more suitable for various formulation developments.
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Baker, Abu, Mohd Salman Khan, Muhammad Zafar Iqbal e Mohd Sajid Khan. "Tumor-targeted Drug Delivery by Nanocomposites". Current Drug Metabolism 21, n. 8 (20 novembre 2020): 599–613. http://dx.doi.org/10.2174/1389200221666200520092333.

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Abstract (sommario):
Background: Tumor-targeted delivery by nanoparticles is a great achievement towards the use of highly effective drug at very low doses. The conventional development of tumor-targeted delivery by nanoparticles is based on enhanced permeability and retention (EPR) effect and endocytosis based on receptor-mediated are very demanding due to the biological and natural complications of tumors as well as the restrictions on the design of the accurate nanoparticle delivery systems. Methods: Different tumor environment stimuli are responsible for triggered multistage drug delivery systems (MSDDS) for tumor therapy and imaging. Physicochemical properties, such as size, hydrophobicity and potential transform by MSDDS because of the physiological blood circulation different, intracellular tumor environment. This system accomplishes tumor penetration, cellular uptake improved, discharge of drugs on accurate time, and endosomal discharge. Results: Maximum drug delivery by MSDDS mechanism to target therapeutic cells and also tumor tissues and sub cellular organism. Poorly soluble compounds and bioavailability issues have been faced by pharmaceutical industries, which are resolved by nanoparticle formulation. Conclusion: In our review, we illustrate different types of triggered moods and stimuli of the tumor environment, which help in smart multistage drug delivery systems by nanoparticles, basically a multi-stimuli sensitive delivery system, and elaborate their function, effects, and diagnosis.
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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.

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Abstract (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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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.

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Abstract (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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Bontaș, Marius Gabriel, Aurel Diacon, Ioan Călinescu, Mădălina Ioana Necolau, Adrian Dinescu, Gabriela Toader, Raluca Ginghină et al. "Epoxy Coatings Containing Modified Graphene for Electromagnetic Shielding". Polymers 14, n. 12 (20 giugno 2022): 2508. http://dx.doi.org/10.3390/polym14122508.

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Abstract (sommario):
This study presents the functionalization and characterization of graphene and electromagnetic interference (EMI) attenuation capacity in epoxy-nanocomposites. The modification of graphene involved both small molecules and polymers for compatibilization with epoxy resin components to provide EMI shielding. The TGA and RAMAN analyses confirmed the synthesis of graphene with a different layer thickness of the graphene sheets. Graphene samples with different layer thicknesses (monolayer, few layers, and multilayer) were selected and further employed for epoxy coating formulation. The obtained nanocomposites were characterized in terms of EMI shielding effectiveness, SEM, micro-CT, magnetic properties, and stress-strain resistance. The EMI shielding effectiveness results indicated that the unmodified graphene and hexamethylene diamine (HMDA) modified graphene displayed the best EMI shielding properties at 11 GHz. However, the epoxy nanocomposites based on HMDA modified graphene displayed better flexibility with an identical EMI shielding effectiveness compared to the unmodified graphene despite the formation of aggregates. The improved flexibility of the epoxy nanocomposites and EMI shielding characteristics of HMDA functionalized graphene offers a practical solution for textile coatings with microwave absorbing (MA) capacity.
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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.

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Abstract (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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Gajdziok, Jan, Sylva Holešová, Jan Štembírek, Erich Pazdziora, Hana Landová, Petr Doležel e David Vetchý. "Carmellose Mucoadhesive Oral Films Containing Vermiculite/Chlorhexidine Nanocomposites as Innovative Biomaterials for Treatment of Oral Infections". BioMed Research International 2015 (2015): 1–15. http://dx.doi.org/10.1155/2015/580146.

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Abstract (sommario):
Infectious stomatitis represents the most common oral cavity ailments. Current therapy is insufficiently effective because of the short residence time of topical liquid or semisolid medical formulations. An innovative application form based on bioadhesive polymers featuring prolonged residence time on the oral mucosa may be a solution to this challenge. This formulation consists of a mucoadhesive oral film with incorporated nanocomposite biomaterial that is able to release the drug directly at the target area. This study describes the unique approach of preparing mucoadhesive oral films from carmellose with incorporating a nanotechnologically modified clay mineral intercalated with chlorhexidine. The multivariate data analysis was employed to evaluate the influence of the formulation and process variables on the properties of the medical preparation. This evaluation was complemented by testing the antimicrobial and antimycotic activity of prepared films with the aim of finding the most suitable composition for clinical application. Generally, the best results were obtained with sample containing 20 mg of chlorhexidine diacetate carried by vermiculite, with carmellose in the form of nonwoven textile in its structure. In addition to its promising physicomechanical, chemical, and mucoadhesive properties, the formulation inhibited the growth ofStaphylococcusandCandida; the effect was prolonged for tens of hours.
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Taymour, Noha, Amal E. Fahmy, Mohamed Abdel Hady Gepreel, Sherif Kandil e Ahmed Abd El-Fattah. "Improved Mechanical Properties and Bioactivity of Silicate Based Bioceramics Reinforced Poly(ether-ether-ketone) Nanocomposites for Prosthetic Dental Implantology". Polymers 14, n. 8 (18 aprile 2022): 1632. http://dx.doi.org/10.3390/polym14081632.

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Abstract (sommario):
Polyether-ether-ketone (PEEK) biomaterial has been increasingly employed for orthopedic, trauma, spinal, and dental implants due to its biocompatibility and in vivo stability. However, a lack of bioactivity and binding ability to natural bone tissue has significantly limited PEEK for many challenging dental implant applications. In this work, nanocomposites based on PEEK reinforced with bioactive silicate-based bioceramics (forsterite or bioglass) as nanofillers were prepared using high energy ball milling followed by melt blending and compression molding. The influence of nanofillers type and content (10, 20 and 30 wt.%) on the crystalline structure, morphology, surface roughness, hydrophilicity, microhardness, elastic compression modulus, and flexural strength of the nanocomposites was investigated. The scanning electron microscopy images of the nanocomposites with low nanofillers content showed a homogenous surface with uniform dispersion within the PEEK matrix with no agglomerates. All nanocomposites showed an increased surface roughness compared to pristine PEEK. It was found that the incorporation of 20 wt.% forsterite was the most effective in the nanocomposite formulation compared with bioglass-based nanocomposites; it has significantly improved the elastic modulus, flexural strength, and microhardness. In vitro bioactivity evaluation, which used biomimetic simulated body fluid indicated the ability of PEEK nanocomposites loaded with forsterite or bioglass nanofillers to precipitate calcium and phosphate bone minerals on its surface. These nanocomposites are expected to be used in long-term load-bearing implant applications and could be recommended as a promising alternative to titanium and zirconia when used as a dental implant material.
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Azahari, Nur Najma Athirah, Hazleen Anuar, Azman Hassan, Mohammed Jawaid, Zahurin Halim e Sani Amril Samsudin. "Thermal, Dynamic Mechanical, Mechanical and Flammability Properties of Halloysite Nanotubes Filled Polyamide 11 Nanocomposites". Malaysian Journal of Fundamental and Applied Sciences 19, n. 2 (18 aprile 2023): 173–93. http://dx.doi.org/10.11113/mjfas.v19n2.2684.

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Abstract (sommario):
The effects of various filler contents on the thermal, dynamic mechanical, mechanical, as well as flammability properties of halloysite nanotubes (HNTs) filler and polyamide 11 (PA 11) matrixes are investigated in this research. The nanocomposites were made out of 100 phr of PA 11 and three distinct HNTs loadings of 2, 4, and 6 phr each. PA 11 nanocomposites without HNTs filler was used as the reference sample. To melt-compound the nanocomposites, a twin-screw extruder was used, and the specimen for testing was then injected using an injection mold. SEM, TGA, DSC, FTIR, DMA, tensile, flexural, impact, and UL-94 flammability tests were conducted on the nanocomposites. Incorporation of 4 phr HNTs into the nanocomposites resulted in the highest tensile and flexural strength. Maximum improvement in the DMA, Young’s and flexural modulus was achieved at 6 phr HNTs content. The elongation at break and TGA resulted the highest increase at 2 phr HNTs content. However, the impact strength decreased with increasing HNTs content. Scanning electron microscopy revealed the ductility of the nanocomposites with increased HNTs content up to 4 phr. The DSC showed a steady increase in melting temperature (Tm) as HNTs content increased up to 4 phr, while the crystallization temperature (Tc) remained unchanged. TGA of PA 11/HNTs nanocomposites showed high thermal stability at 2 phr HNTs content. However, on further addition of HNTs up to 6 phr, thermal stability of the nanocomposites decreased due to the excess amount of HNTs. All the nanocomposites passed the horizontal and vertical UL-94 test with HB and V-2 grade. PA 11/4HNTs nanocomposite has the highest tensile strength, flexural strength compared to other PA 11/HNTs nanocomposites. PA 11/4HNTs nanocomposite can be suggested as an optimum formulation with balanced mechanical properties in terms of toughness.
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Karatrantos, Argyrios V., Clement Mugemana, Lyazid Bouhala, Nigel Clarke e Martin Kröger. "From Ionic Nanoparticle Organic Hybrids to Ionic Nanocomposites: Structure, Dynamics, and Properties: A Review". Nanomaterials 13, n. 1 (20 dicembre 2022): 2. http://dx.doi.org/10.3390/nano13010002.

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Abstract (sommario):
Ionic nanoparticle organic hybrids have been the focus of research for almost 20 years, however the substitution of ionic canopy by an ionic-entangled polymer matrix was implemented only recently, and can lead to the formulation of ionic nanocomposites. The functionalization of nanoparticle surface by covalently grafting a charged ligand (corona) interacting electrostatically with the oppositely charged canopy (polymer matrix) can promote the dispersion state and stability which are prerequisites for property “tuning”, polymer reinforcement, and fabrication of high-performance nanocomposites. Different types of nanoparticle, shape (spherical or anisotropic), loading, graft corona, polymer matrix type, charge density, molecular weight, can influence the nanoparticle dispersion state, and can alter the rheological, mechanical, electrical, self-healing, and shape-memory behavior of ionic nanocomposites. Such ionic nanocomposites can offer new properties and design possibilities in comparison to traditional polymer nanocomposites. However, to achieve a technological breakthrough by designing and developing such ionic nanomaterials, a synergy between experiments and simulation methods is necessary in order to obtain a fundamental understanding of the underlying physics and chemistry. Although there are a few coarse-grained simulation efforts to disclose the underlying physics, atomistic models and simulations that could shed light on the interphase, effect of polymer and nanoparticle chemistry on behavior, are completely absent.
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48

Mirizzi, Lorenzo, Mattia Carnevale, Massimiliano D’Arienzo, Chiara Milanese, Barbara Di Credico, Silvia Mostoni e Roberto Scotti. "Tailoring the Thermal Conductivity of Rubber Nanocomposites by Inorganic Systems: Opportunities and Challenges for Their Application in Tires Formulation". Molecules 26, n. 12 (10 giugno 2021): 3555. http://dx.doi.org/10.3390/molecules26123555.

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Abstract (sommario):
The development of effective thermally conductive rubber nanocomposites for heat management represents a tricky point for several modern technologies, ranging from electronic devices to the tire industry. Since rubber materials generally exhibit poor thermal transfer, the addition of high loadings of different carbon-based or inorganic thermally conductive fillers is mandatory to achieve satisfactory heat dissipation performance. However, this dramatically alters the mechanical behavior of the final materials, representing a real limitation to their application. Moreover, upon fillers’ incorporation into the polymer matrix, interfacial thermal resistance arises due to differences between the phonon spectra and scattering at the hybrid interface between the phases. Thus, a suitable filler functionalization is required to avoid discontinuities in the thermal transfer. In this challenging scenario, the present review aims at summarizing the most recent efforts to improve the thermal conductivity of rubber nanocomposites by exploiting, in particular, inorganic and hybrid filler systems, focusing on those that may guarantee a viable transfer of lab-scale formulations to technological applicable solutions. The intrinsic relationship among the filler’s loading, structure, morphology, and interfacial features and the heat transfer in the rubber matrix will be explored in depth, with the ambition of providing some methodological tools for a more profitable design of thermally conductive rubber nanocomposites, especially those for the formulation of tires.
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49

Guadagno, Liberata, Luigi Vertuccio, Carlo Naddeo, Elisa Calabrese, Giuseppina Barra, Marialuigia Raimondo, Andrea Sorrentino, Wolfgang H. Binder, Philipp Michael e Sravendra Rana. "Reversible Self-Healing Carbon-Based Nanocomposites for Structural Applications". Polymers 11, n. 5 (17 maggio 2019): 903. http://dx.doi.org/10.3390/polym11050903.

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Reversible Hydrogen Bonds (RHB) have been explored to confer self-healing function to multifunctional nanocomposites. This study has been carried out through a sequence of different steps. Hydrogen bonding moieties, with the intrinsic ability to simultaneously perform the functions of both hydrogen donors and acceptors, have been covalently attached to the walls of carbon nanotubes. The epoxy matrix has been modified to adapt the formulation for hosting self-healing mechanisms. It has been toughened with different percentages of rubber phase covalently linked to the epoxy precursor. The most performant matrix, from the mechanical point of view, has been chosen for the incorporation of MWCNTs. Self-healing performance and electrical conductivities have been studied. The comparison of data related to the properties of nanocomposites containing incorporated functionalized and nonfunctionalized MWCNTs has been performed. The values of the electrical conductivity of the self-healing nanocomposites, containing 2.0% by weight of functionalized multiwalled carbon nanotubes (MWCNTs), range between 6.76 × 10−3 S/m and 3.77 × 10−2 S/m, depending on the nature of the functional group. Curing degrees, glass transition temperatures, and storage moduli of the formulated multifunctional nanocomposites prove their potential for application as functional structural materials.
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50

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.

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Abstract (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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