Journal articles: 'Silver-titanium nanoparticles'

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Maciejewska, Julia, Magdalena Oćwieja, Zbigniew Adamczyk, Elżbieta Bielańska, and Bogna Napruszewska. "Titanium dioxide/silver nanoparticle bilayers prepared in self-assembly processes." Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia 71, no. 1 (May 24, 2016): 29. http://dx.doi.org/10.17951/aa.2016.71.1.29.

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A new method for the preparation of TiO2/Ag bilayers via colloid self-assembly process using well-characterized titanium dioxide and silver suspensions was developed. The titanium dioxide nanoparticles, forming a supporting layer, were 46 nm in diameter, exhibiting an isoelectric point at pH 6.4. The silver nanoparticles, forming an external layer of the diameter of 50 nm were prepared via a chemical reduction method with the presence inorganic phosphate salts. The electrophoretic mobility measurements revealed that the zeta potential of silver nanoparticles was highly negative for a broad range of pH and ionic strengths. By explaining this information, the optimum condition for the silver nanoparticle immobilization on TiO2 supporting layers were selected. The coverage of the first layer was adjusted by ionic strength of the suspensions and by the deposition time. Afterward, the silver nanoparticle monolayers of controlled coverage were deposited under the diffusion-controlled transport. Their coverage was determined by a direct enumeration of deposited nanoparticles from AFM images and SEM micrographs. The experimental results showed that for extended deposition times, the coverage of silver nanoparticle layers significantly increases with ionic strength. Therefore, it was proven that the formation of bilayers is mainly controlled by electrostatic interactions and that it is feasible to produce uniform TiO2/Ag materials of desired coverage and structure.

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Hajdu, Péter, István Lampé, Richárd Rácz, Sándor Biri, Attila Csík, Ferenc Tóth, Melinda Szalóki, et al. "Optimized Size and Distribution of Silver Nanoparticles on the Surface of Titanium Implant Regarding Cell Viability." Applied Sciences 10, no. 20 (October 12, 2020): 7063. http://dx.doi.org/10.3390/app10207063.

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Though the antibacterial effect is advantageous, silver and silver nanoparticles can negatively affect the viability of human tissues. This study aims to check the viability of cells on surfaces with different particle size and to find the biologically optimal configuration. We investigated the effect of modified thickness of vaporized silver and applied heat and time on the physical characteristics of silver nanoparticle covered titanium surfaces. Samples were examined by scanning electron microscopy, mass spectrometry, and drop shape analyzer. To investigate how different physical surface characteristics influence cell viability, Alamar Blue assay for dental pulp stem cells was carried out. We found that different surface characteristics can be achieved by modifying procedures when creating silver nanoparticle covered titanium. The size of the nanoparticles varied between 60 to 368 nm, and hydrophilicity varied between 63 and 105 degrees of contact angle. Investigations also demonstrated that different physical characteristics are related to a different level of viability. Surfaces covered with 60 nm particle sizes proved to be the most hydrophilic, and the viability of the cells was comparable to the viability measured on the untreated control surface. Physical and biological characteristics of silver nanoparticle covered titanium, including cell viability, have an acceptable level to be used for antibacterial effects to prevent periimplantitis around implants.

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Heilman, S., and L. G. A. Silva. "Silver and Titanium Nanoparticles Used as Coating on Polyurethane Catheters." Journal of Nano Research 47 (May 2017): 17–23. http://dx.doi.org/10.4028/www.scientific.net/jnanor.47.17.

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Silver nanoparticles have been used in the medical area due to their remarkable antimicrobial properties. In this sense titanium dioxide nanoparticles obtained by the sol-gel method were used as coating of catheters for subsequent impregnation of silver nanoparticles with gamma irradiation and electron beam at 25 and 50 kGy. This work aimed to study the use of the silver nanoparticles and titanium dioxide as coating of polyurethane Central Venous Catheter (CVC) for antimicrobial activity. Furthermore the amounts of titanium and silver present in the coated catheters had been evaluated by Inductively Coupled Plasma – Optical Emission Spectrometry (ICP OES). Therefore the Raman spectrometry was used to identify the polymorph of titanium oxide, rutile.

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Bekeschus, Sander. "Combined Toxicity of Gas Plasma Treatment and Nanoparticles Exposure in Melanoma Cells In Vitro." Nanomaterials 11, no. 3 (March 22, 2021): 806. http://dx.doi.org/10.3390/nano11030806.

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Despite continuous advances in therapy, cancer remains a deadly disease. Over the past years, gas plasma technology emerged as a novel tool to target tumors, especially skin. Another promising anticancer approach are nanoparticles. Since combination therapies are becoming increasingly relevant in oncology, both gas plasma treatment and nanoparticle exposure were combined. A series of nanoparticles were investigated in parallel, namely, silica, silver, iron oxide, cerium oxide, titanium oxide, and iron-doped titanium oxide. For gas plasma treatment, the atmospheric pressure argon plasma jet kINPen was utilized. Using three melanoma cell lines, the two murine non-metastatic B16F0 and metastatic B16F10 cells and the human metastatic B-Raf mutant cell line SK-MEL-28, the combined cytotoxicity of both approaches was identified. The combined cytotoxicity of gas plasma treatment and nanoparticle exposure was consistent across all three cell lines for silica, silver, iron oxide, and cerium oxide. In contrast, for titanium oxide and iron-doped titanium oxide, significantly combined cytotoxicity was only observed in B16F10 cells.

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Saadmim, Faizah, Taseen Forhad, Ahmed Sikder, William Ghann, Meser M. Ali, Viji Sitther, A. J. Saleh Ahammad, Md Abdus Subhan, and Jamal Uddin. "Enhancing the Performance of Dye Sensitized Solar Cells Using Silver Nanoparticles Modified Photoanode." Molecules 25, no. 17 (September 3, 2020): 4021. http://dx.doi.org/10.3390/molecules25174021.

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In this study, silver nanoparticles were synthesized, characterized, and applied to a dye-sensitized solar cell (DSSC) to enhance the efficiency of solar cells. The synthesized silver nanoparticles were characterized with UV–Vis spectroscopy, dynamic light scattering, transmission electron microscopy, and field emission scanning electron microscopy. The silver nanoparticles infused titanium dioxide film was also characterized by Fourier transform infrared and Raman spectroscopy. The performance of DSSC fabricated with silver nanoparticle-modified photoanode was compared with that of a control group. The current and voltage characteristics of the devices as well as the electrochemical impedance measurements were also carried out to assess the performance of the fabricated solar cells. The solar-to-electric efficiency of silver nanoparticles based DSSC was 1.76%, which is quite remarkable compared to the 0.98% realized for DSSC fabricated without silver nanoparticles.

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Aluicio-Sarduy, Eduardo, Simone Callegari, Diana Gisell Figueroa del Valle, Andrea Desii, Ilka Kriegel, and Francesco Scotognella. "Electric field induced structural colour tuning of a silver/titanium dioxide nanoparticle one-dimensional photonic crystal." Beilstein Journal of Nanotechnology 7 (October 6, 2016): 1404–10. http://dx.doi.org/10.3762/bjnano.7.131.

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An electric field is employed for the active tuning of the structural colour in photonic crystals, which acts as an effective external stimulus with an impact on light transmission manipulation. In this work, we demonstrate structural colour in a photonic crystal device comprised of alternating layers of silver nanoparticles and titanium dioxide nanoparticles, exhibiting spectral shifts of around 10 nm for an applied voltage of only 10 V. The accumulation of charge at the metal/dielectric interface with an applied electric field leads to an effective increase of the charges contributing to the plasma frequency in silver. This initiates a blue shift of the silver plasmon band with a simultaneous blue shift of the photonic band gap as a result of the change in the silver dielectric function (i.e. decrease of the effective refractive index). These results are the first demonstration of active colour tuning in silver/titanium dioxide nanoparticle-based photonic crystals and open the route to metal/dielectric-based photonic crystals as electro-optic switches.

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Karthikeyan, Vasudevan, Naveen Gopi Chander, Jetti Ramesh Reddy, and Balasubramanium Muthukumar. "Effects of incorporation of silver and titanium nanoparticles on feldspathic ceramic toughness." Journal of Dental Research, Dental Clinics, Dental Prospects 13, no. 2 (August 14, 2019): 98–102. http://dx.doi.org/10.15171/joddd.2019.015.

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Background. Porcelain is brittle and in many situations it requires replacement in fractured or chipped restorations. The prospects exist in improving the strength of feldspathic porcelain to widen its applications. This study evaluated the fracture toughness of feldspathic porcelain after incorporation of silver and titanium nanoparticles at varying concentrations (0.5 wt%, 1 wt%, 1.5 wt% and 2 wt%). Methods. Test specimen dimensions were standardized to ASTM C1421–16 standards and a three-point flexure test was carried out to evaluate fracture toughness. A total of 330 samples were fabricated and broadly divided into three groups. Group I (titanium nanoparticles) and group II (silver nanoparticles) were further subdivided into 5 groups (0 wt%, 0.5 wt%, 1 wt%, 1.5 wt% and 2 wt%) for fracture toughness analysis, with each group consisting of 30 samples. Group III contained the superior concentration of both titanium and silver nanoparticles. The fracture toughness (KIC) was calculated using indentation fracture method and microstructure observations were made using scanning electron microscopy. The KIC values were compared and evaluated using one-way ANOVA. Results. Data were analyzed using one-way ANOVA and Tukey’s HSD post hoc test multiple comparisons. The mean values of group I, group II and group III were 1.949 MPa.m1/2, 2.002 MPa.m1/2 and 1.330 MPa.m1/2 , respectively. Conclusion. The results revealed that the samples reinforced with titanium and silver nanoparticles showed significant increases in fracture toughness. The blending of superior concentration of both titanium and silver nanoparticles decreased fracture resistance.

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Zhang, Yinqing, Liwen Qiang, Yuting Yuan, Wei Wu, Binbin Sun, and Lingyan Zhu. "Impacts of titanium dioxide nanoparticles on transformation of silver nanoparticles in aquatic environments." Environmental Science: Nano 5, no. 5 (2018): 1191–99. http://dx.doi.org/10.1039/c8en00044a.

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Zhang, Kai, Li Yu, Zhi Xin Lu, and Gang Song. "Synthesis and Characterization of Silver Nanoparticles Coated Titanium Dioxide Nanowires." Materials Science Forum 663-665 (November 2010): 1175–78. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1175.

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For the sake of investigating the special optical character of heteronanostructures, we grow TiO2 nanowires following a three step synthesis method and coat silver nanoparticles on these nanowires with replacement method. Firstly, by adjusting the experiment parameters, we get the single crystalline titanium dioxide nanowires and control their length and diameter successfully. Secondly, we use the replacement method to make the silver nanoparticles coated on these nanowires. Finally, we use transmission electron microscopy and X-ray diffraction to characterize these productions and the results show that the silver nanoparticles are coated on the titanium dioxide nanowires uniformly and the components of these nanowires are only sliver and titanium dioxide. These new optical heteronanostructures are widely investigated all over the world and we sure that they can make great influences to the development of nanophotonics.

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Zulkifli, M. R., A. R. Nurhamizah, Jariah Mohd Juoi, Zaleha Mustafa, and Zurina Shamsudin. "Silver Nanoparticles in TiO₂ Coatings for Potential Antimicrobial Coatings." Advanced Materials Research 1087 (February 2015): 20–24. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.20.

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This research aims to determine the effect of silver nanoparticles concentrations as antimicrobial coatings when doped to TiO2 coatings. The TiO2 coatings were prepared by sol–gel method initiating Titanium Isopropoxide–Propanol mixture as a precursor solution. The silver nanoparticles (40 nm) were then doped to the coating after sintering at 500°C. Two concentrations of silver nanoparticles, (50 ppm and 1000 ppm), were prepared for comparison in this study. Microstructure and crystalline phase of coatings were evaluated using Scanning Electron Microscope (SEM) and Glancing Angle X-Ray Difraction (GAXRD) technique. The antibacterial test was according to McFarland standard for detecting E.Coli, S.Aerues, fungas and Methicillin-Resistant Staphylococcus Aureus (MRSA). Results show that only coatings with the concentrations of 1000 ppm of silver nanoparticle function as antimicrobial coatings.

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Xu, Zhixiang, Jianyuan Zhang, Haiqin Liu, Pengpeng Kuang, Shuang Wang, and Xiaoqi Fu. "Preparation of silver/silver bromide/titanium dioxide/graphene oxide nanocomposite for photocatalytic degradation of 4-chlorophenol." Nanomaterials and Nanotechnology 7 (January 1, 2017): 184798041772404. http://dx.doi.org/10.1177/1847980417724046.

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A ultaviolet–visible light responded photocatalytic nanocomposite, silver/silver bromide/titanium dioxide, supported on graphene oxide (GO; silver/silver bromide/titanium dioxide/GO) was fabricated via a layer intercalation method using n-butylamine, cetyltrimethyl ammonium bromide, titanium dioxide and silver/silver bromide-intercalated GO successively. The resultant silver/silver bromide/titanium dioxide/GO exhibited much stronger visible light absorption and enhanced photocatalytic efficiency than titanium dioxide/GO and titanium dioxide. Furthermore, the degradation efficiency of silver/silver bromide/titanium dioxide/GO was improved when irradiated under light without the ultaviolet cut filter. The apparent degradation rate constants, k, for silver/silver bromide/titanium dioxide/GO, titanium dioxide/GO and titanium dioxide are 0.5192, 0.2273 and 0.0627 h−1. A possible photocatalytic degradation mechanism for degradation of 4-chlorophenol by silver/silver bromide/titanium dioxide/GO under irradiation with/without the ultaviolet cut filter was proposed. The factors including the visible light response from silver bromide, surface plasmon ‘hot’ electron effect from silver nanoparticles and efficient electron transfer among silver, silver bromide, titanium dioxide and GO are contributed to enhance the photocatalytic activity under visible light irradiation, while the additional factor of ultaviolet light response from titanium dioxide plays an important role under light irradiation without the ultaviolet cut filter. The resultant silver/silver bromide/titanium dioxide/GO possessed a good photochemical stability and reusability.

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Cao, Huiliang, Wenjie Zhang, Fanhao Meng, Jinshu Guo, Donghui Wang, Shi Qian, Xinquan Jiang, Xuanyong Liu, and Paul K. Chu. "Osteogenesis Catalyzed by Titanium-Supported Silver Nanoparticles." ACS Applied Materials & Interfaces 9, no. 6 (February 2, 2017): 5149–57. http://dx.doi.org/10.1021/acsami.6b15448.

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Sharonova, A., M. Surmeneva, K. Loza, O. Prymak, M. Epple, and R. Surmenev. "Surface functionalization of titanium with silver nanoparticles." Journal of Physics: Conference Series 1145 (January 2019): 012032. http://dx.doi.org/10.1088/1742-6596/1145/1/012032.

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Vijayalakshmi, A., and S. Srinivas. "A Study on Hydromagnetic Pulsating Flow of a Nanofluid in a Porous Channel With Thermal Radiation." Journal of Mechanics 33, no. 2 (August 19, 2016): 213–24. http://dx.doi.org/10.1017/jmech.2016.74.

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AbstractThe present study investigates the hydromagnetic pulsating nanofluid flow in a porous channel with thermal radiation. In this work, we considered water as the base fluid and silver (Ag), copper (Cu), alumina (Al2O3) and titanium dioxide (TiO2) as nanoparticles. The Maxwell-Garnetts and Brinkman models are used to evaluate the effective thermal conductivity and viscosity of the nanofluid. The governing equations are solved analytically and the influence of various parameters on velocity, temperature and heat transfer rate has been discussed through graphical results. From the results, it is found that the rate of heat transfer enhances with an increase of nanoparticle volume fraction. Further, the heat transfer rate is higher for silver nanoparticles as compared with copper, alumina and titanium dioxide.

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Tang, Bin, Mingwen Zhang, Ya Yao, Lu Sun, Jingliang Li, Shuping Xu, Wu Chen, Weiqing Xu, and Xungai Wang. "Photoinduced reversible shape conversion of silver nanoparticles assisted by TiO2." Phys. Chem. Chem. Phys. 16, no. 40 (2014): 21999–2007. http://dx.doi.org/10.1039/c4cp02874k.

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Titanium dioxide quantum dots promote shape transformation of silver nanoparticles from nanoprisms to nanodecahedra upon ultraviolet light irradiation. The obtained silver nanodecahedra are reconverted to silver nanoprisms under sodium lamp.

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Yazdanshenas, Mohammad Esmail, Rogheih Damerchely, Abo Saied Rashidi, and Ramin Khajavi. "Bioactive Nano-Composite Multifilament Yarns." Journal of Engineered Fibers and Fabrics 7, no. 1 (March 2012): 155892501200700. http://dx.doi.org/10.1177/155892501200700108.

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Physical, mechanical and antimicrobial properties of nylon 6 (polycaprolactam) doped with different amounts of silver nanoparticles were investigated in this study. Two series of filament yarns counts (20 and 70 Denier) were produced by melt spinning method with different amounts of silver nanoparticles contents (0, 0.5, 1 and 4 wt%). Elemental analysis of silver and titanium dioxide (present in polymer as delustering agent) was carried out by energy dispersive X-ray (EDX) and inductively coupled plasma mass spectrometry (ICP-MS) methods. Tensile testing, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) were used to characterize the yarns. Antimicrobial activities were quantitatively evaluated against Escherichia Coli (gram-negative) and Staphylococcus Aureus (gram-positive) bacteria. The doped nylon 6 fibers showed a well dispersed distribution of silver nanoparticles. Yarns with 0.5–1.0 wt% of silver nanoparticle content were found to have improved physical and mechanical properties, as well as, significant antimicrobial activity.

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García, Inés, Camino Trobajo, Zakariae Amghouz, and Alaa Adawy. "Nanolayered Metal Phosphates as Biocompatible Reservoirs for Antimicrobial Silver Nanoparticles." Materials 14, no. 6 (March 18, 2021): 1481. http://dx.doi.org/10.3390/ma14061481.

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There is an increasing demand on synthesizing pharmaceuticals and biomaterials that possess antimicrobial and/or antiviral activities. In this respective silver nanoparticles are known for their excellent antimicrobial activity. Nevertheless, their uncontrolled release in a biological medium can induce a cytotoxic effect. For this, we explored the use of nanolayered metal phosphates based on titanium and zirconium as materials that can be enriched with silver nanoparticles. Employing the hydrothermal route, crystalline α-phases of zirconium and titanium phosphates (α-ZrP, α-TiP) were synthesized and there after surface-enriched with silver nanoparticles. The structural assessment confirmed the stability of the structures and their sizes are in the nanoscale at least in one dimension. The cytocompatibility assays confirmed the biocompatibility of the pristine phases and the antimicrobial assay confirmed that both silver-enriched nanolayered structures maintain an antibacterial effect at reasonably low concentrations.

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Davidova, Olga I., Anton S. Kraev, Olga L. Evdokimova, Tatyana V. Gerasimova, and Alexander V. Agafonov. "SOLUTION METHOD FOR PRODUCTION OF OPTICALLY ACTIVE MULTILAYER TITANIUM DIOXIDE -NANOSILVER COATINGS ONTO POLYETHER SUBSTRATE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 59, no. 6 (July 12, 2018): 78. http://dx.doi.org/10.6060/tcct.20165906.5394k.

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Photochromic multilayer TiO2/Ag/TiO2 coating was prepared on plastic PET substrate using a solution method. The titanium dioxide sol was successfully produced using the titanium tetraisopropoxide as precursor and the nitric acid as peptizing agent via the low-temperature sol-gel synthesis in aqueous medium. Titanium dioxide films were prepared by a sol-gel dip coating method from a colloid solution of nanocrystalline TiO2 sol. Thus, nanocrystalline titanium dioxide sol and an aqueous solution of silver complex [Ag(NH3)2]NO3 followed by a photolysis for the reduction of silver ions to Ag nanoparticles with a plasmon resonance have been alternately deposited layer-by-layer. In result, heterostructures possessing photochromic properties were formed. The TiO2/Ag/TiO2 coating was investigated by UV-Vis spectroscopy, X-ray diffraction and atomic force microscope (AFM) with different resolutions. The TiO2 crystal phase formed during temperature dehydration possesses high photoactivity as the generated nanoparticles size of about 10 nm is an optimum for the most effective absorption of a light quantum and the generation of electron–hole pairs on the surface. It was found the use of silver nanoparticles also promotes an increase in the photoactivity of a film owing to larger water adsorption on the surface of a composite due to the nanoparticle surface effect, which is promoted by a high concentration of the photogenerated holes whose presence is confirmed by composite conductivity type. Thus, the photochromic multilayer TiO2/Ag/TiO2 coating described in this work are expected to find important applications to the fabrication of photochromic materials, optical filters or sensors.

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Yu, Xiao Qian, and Li Xin Xu. "Effects of Silver Nanoparticles on the In Vitro Culture and Differentiation of Human Bone Marrow-Derived Mesenchymal Cells." Materials Science Forum 852 (April 2016): 1307–12. http://dx.doi.org/10.4028/www.scientific.net/msf.852.1307.

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The antibacterial properties of silver nanoparticles may be able to prevent inflammation around an implant when placed on the surface of the dental neck. The purpose of this study was to culture silver nanoparticles on human bone marrow stem cells in vitro to determine their effects on cell differentiation and to assess their biocompatibility. Silver nanoparticles were deposited on titanium foil implant surfaces using ion sputtering, and adult bone marrow mesenchymal stem cells were cultured on those surfaces to determine the effect of the silver nanoparticles on cell viability, suitability for subculture, proliferation and differentiation. The results indicated that the silver nanoparticles were biocompatible, allowing cell proliferation and differentiation of osteoblasts, but interfered with differentiation into chondrocytes and adipocytes.

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Zhang, Peng, Zhiguo Zhang, and Wei Li. "AntibacterialTiO2Coating Incorporating Silver Nanoparticles by Microarc Oxidation and Ion Implantation." Journal of Nanomaterials 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/542878.

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Infection associated with titanium implants remains the most common serious complication in hard tissue replacement surgery. Since such postoperative infections are usually difficult to cure, it is critical to find optimal strategies for preventing infections. In this study, TiO2coating incorporating silver (Ag) nanoparticles were fabricated on pure titanium by microarc oxidation and ion implantation. The antibacterial activity was evaluated by exposing the specimens toStaphylococcus aureusand comparing the reaction of the pathogens to Ti-MAO-Ag with Ti-MAO controls. Ti-MAO-Ag clearly inhibited bacterial colonization more than the control specimen. The coating’s antibacterial ability was enhanced by increasing the dose of silver ion implantation, and Ti-MAO-Ag20.0 had the best antibacterial ability. In addition, cytocompatibility was assessed by culturing cell colonies on the specimens. The cells grew well on both specimens. These findings indicate that surface modification by means of this process combining MAO and silver ion implantation is useful in providing antibacterial activity and exhibits cytocompatibility with titanium implants.

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Kadhum, Mohammed, Tahseen Mubarak, and Nadia Jassim. "Structural and Fluorescence Properties of TiO2/Ag Nanoparticles Bilayers." Diyala Journal For Pure Science 17, no. 3 (July 1, 2021): 55–70. http://dx.doi.org/10.24237/djps.17.03.557c.

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The optical properties of the TiO2 / Ag hybrid nanoparticles were improved as the particles were prepared with a pulsed liquid laser ablation (PLAL) technology. The effect of number of pulses (450) on the structural and optical properties of nanoparticles prepared in distilled water (DW) as growth media was examined using a Q-Switched Nd-YAG laser with wavelength (1064 nm), ablation energy (530 mJ) and repetition rate (1Hz). The distance between the target and the lens (10 cm). Several were used for the diagnosis such as X-ray diffraction analysis, fourier infrared transformations, TEM assays and fluorescence of the prepared samples. The results of X-ray diffraction analysis of the silver nanoparticles deposited on a glass slide showed that the crystal system is cubic and polycrystalline, with the direction being dominated by [111] at the level of the crystals. The results of X-ray diffraction analysis of a solution of titanium dioxide nanoparticles deposited on a glass slide revealed the presence of a quadrangular crystal system, indicating the presence of titanium dioxide particles in (rutile), and that the prevailing trend for crystalline levels is [110]. The functional groups of (TiO2 / Ag) were determined in the liquid medium by the (FTIR) technique. Also, TEM images showed the presence of nanoparticles and microparticles in an almost spherical shape. The fluorescence measurement of (TiO2 / Ag) hybrid particles showed that through the graph the peak values of (284.1) and (418.3) nm. This is roughly identical to the absorption spectrum results of a hybrid silver and titanium dioxide nanoparticle solution.

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Ambroziak, Robert, Marcin Hołdyński, Tomasz Płociński, Marcin Pisarek, and Andrzej Kudelski. "Cubic Silver Nanoparticles Fixed on TiO2 Nanotubes as Simple and Efficient Substrates for Surface Enhanced Raman Scattering." Materials 12, no. 20 (October 16, 2019): 3373. http://dx.doi.org/10.3390/ma12203373.

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In this work we show that ordered freestanding titanium oxide nanotubes (TiO2 NT) may be used as substrates for the simple and efficient immobilization of anisotropic plasmonic nanoparticles. This is important because anisotropic plasmonic nanostructures usually give greater spectral enhancement than spherical nanoparticles. The size of the pores in a layer of titanium oxide nanotubes can be easily fitted to the size of many silver plasmonic nanoparticles highly active in SERS (surface-enhanced Raman scattering) spectroscopy (for example, silver nanocubes with an edge length of ca. 45 nm), and hence, the plasmonic nanoparticles deposited can be strongly anchored in such a titanium oxide substrate. The tubular morphology of the TiO2 substrate used allows a specific arrangement of the silver plasmonic nanoparticles that may create many so-called SERS hot spots. The SERS activity of a layer of cubic Ag nanoparticles (AgCNPs) deposited on a tubular TiO2 substrate (AgCNPs@TiO2 NT) is about eight times higher than that of the standard electrochemically nanostructured surface of a silver electrode (produced by oxidation reduction cycling). Furthermore, a super hydrophilic character of the TiO2 nanotubes surface allows for a uniform distribution of AgCNPs, which are deposited from an aqueous suspension. The new AgCNPs@TiO2 NT hybrid layer ensures a good reproducibility of SERS measurements and exhibits a higher temporal stability of the achievable total SERS enhancement factor—one that is far better than standard SERS silver substrates. To characterize the morphology and chemical composition of such evidently improved SERS platforms thus received, we applied microscopic techniques (SEM, and scanning transmission electron microscopy (STEM)) and surface analytical techniques (Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS)).

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Obregon, Isidro D., Brandi S. Betts-Obregon, Brian Yust, Francisco Pedraza, Alexandra Ortiz, Dhiraj Sardar, and Andrew T. Tsin. "Effect of Silver Coating on Barium Titanium Oxide Nanoparticle Toxicity." Advanced Materials Research 787 (September 2013): 404–7. http://dx.doi.org/10.4028/www.scientific.net/amr.787.404.

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Nanoparticles are presently being studied for optical and biomedical applications such as medical imaging and drug delivery. Nanoparticles impact the cellular environment due to many variables such as size, shape, and composition. How these factors affect cell viability is not fully understood. The purpose of this study is to test the toxicity effects of silver coating (Ag@) Barium Titanium Oxide (BaTiO3) nanoparticles on Rhesus Monkey Retinal Endothelial cells (RhRECs) in culture. The addition of silver to the nanoparticles increases their nonlinear optical properties significantly, making the Ag@BaTiO3 nanoparticles good candidates for nonlinear microscopy contrast agents. We hypothesize that by silver coating nanoparticles, there will be an increase in cell viability at higher concentrations when compared to non-silver coated nanoparticles. RhRECs were treated with BaTiO3 and Ag@BaTiO3 at concentrations of 0, 1.0, 10.0, and 100μg/ml for 24 hours at 370C + 5%CO2. After 24 hour incubation with respective nanoparticles, cell viability was determined using the trypan blue dye-exclusion method. Treatment with 0, 1.0 and 10.0μg/ml of Ag@BaTiO3 had minimal effect on cell viability, with 90% viable cells remaining at the end of the 24 hours treatment period. However, cells treated with 100μg/ml of Ag@BaTiO3 resulted in a decrease to 51% viable cells. Comparatively, cells treated with 0, 1.0 and 10μg/ml of BaTiO3 had no significant effect on cell viability (90% viable cells after treatment) while the 100μg/ml treatment resulted in a decrease to 29% viable cells. These results show that silver coating of BaTiO3 nanoparticles has a protective effect on cellular toxicity at high concentrations.

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Chen, Jialong, May Lei Mei, Quan-Li Li, and Chun-Hung Chu. "Mussel-inspired silver-nanoparticle coating on porous titanium surfaces to promote mineralization." RSC Advances 6, no. 106 (2016): 104025–35. http://dx.doi.org/10.1039/c6ra20673e.

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Smanaliev, M., and I. Yuldashev. "Possibilities of Dental Titanium Implants Surface Coating With Nano Particles from Nano Silver Solution." Bulletin of Science and Practice 7, no. 9 (September 15, 2021): 308–14. http://dx.doi.org/10.33619/2414-2948/70/26.

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Studied the silver nanoparticles antibacterial action when it coated titanium dental implants. The accumulation of nano-silver on implants surface obtained by scanning electron microscopy and energy dispersive X-ray spectroscopy. The distribution of nano silver is uneven throughout the entire length of the implant. Nano silver is scattered over the surface of the implant with a particle size of up to 5 nM.

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Wodka, Dawid, Elżbieta Bielańska, Robert P. Socha, Magdalena Elżbieciak - Wodka, Jacek Gurgul, Paweł Nowak, Piotr Warszyński, and Izumi Kumakiri. "Photocatalytic Activity of Titanium Dioxide Modified by Silver Nanoparticles." ACS Applied Materials & Interfaces 2, no. 7 (June 22, 2010): 1945–53. http://dx.doi.org/10.1021/am1002684.

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Lappas, Courtney M. "The immunomodulatory effects of titanium dioxide and silver nanoparticles." Food and Chemical Toxicology 85 (November 2015): 78–83. http://dx.doi.org/10.1016/j.fct.2015.05.015.

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Mofarrehi, M. R., and Seyed Abbas Shojaosadati. "Antibacterial properties of pure titanium coated with silver nanoparticles." International Journal of Nano and Biomaterials 4, no. 3/4 (2012): 281. http://dx.doi.org/10.1504/ijnbm.2012.051711.

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Alajmi, Zafer, Tao Fu, Yan Tao Zhao, Shui Yun Yang, and Jia Mao Sun. "Ag-Enhanced Antibacterial Property of MgO Film." Materials Science Forum 859 (May 2016): 90–95. http://dx.doi.org/10.4028/www.scientific.net/msf.859.90.

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MgO and silver-containing MgO (AgMgO, 3.3, 9.1 at% Ag) films were sol-gel coated on titanium to improve its antibacterial property. Thermal analyses of MgAc2·4H2O powder revealed that MgO was crystallized at 400 °C. X-ray diffraction analysis showed that MgO was converted to Mg(OH)2 or Mg5(CO3)4(OH)2·4H2O during the ageing in air. Silver nanoparticles at the surface of AgMgO films were identified by scanning electron microscopy and x-ray photoelectron spectroscopy. The MgO film was about 1.5 um thick. The potentiodynamic polarization test in the Ca-free Hank’s balanced salt solution showed that the coated titanium samples had better corrosion resistance than the polished one. The dissolution of silver nanoparticles resulted in a current peak in the polarization plots. In the antibacterial test against E. Coli, the inhibition zone width was 0.3, 1.6, 2.0 mm for the films with 0, 3.3, 9.1 at% Ag, respectively. The bactericidal mechanisms of the MgO and AgMgO films were discussed. The present work would provide a facile method for antibacterial surface modification of titanium based osteo-implants.

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El-Shafai, Nagi, Mohamed E. El-Khouly, Maged El-Kemary, Mohamed Ramadan, Ibrahim Eldesoukey, and Mamdouh Masoud. "Graphene oxide decorated with zinc oxide nanoflower, silver and titanium dioxide nanoparticles: fabrication, characterization, DNA interaction, and antibacterial activity." RSC Advances 9, no. 7 (2019): 3704–14. http://dx.doi.org/10.1039/c8ra09788g.

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The fabrication, characterization, and antibacterial activity of novel nanocomposites based on graphene oxide (GO) nanosheets decorated with silver, titanium dioxide nanoparticles, and zinc oxide nanoflowers were examined.

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Syrek, Karolina, Joanna Grudzień, Aneta Sennik-Kubiec, Anna Brudzisz, and Grzegorz D. Sulka. "Anodic Titanium Oxide Layers Modified with Gold, Silver, and Copper Nanoparticles." Journal of Nanomaterials 2019 (February 7, 2019): 1–10. http://dx.doi.org/10.1155/2019/9208734.

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Titanium(IV) oxide is commonly used in photocatalysis. However, it has some drawbacks, e.g., a high rate of electron-hole recombination and a wide bandgap. In here, the surface of anodic titanium(IV) oxide (ATO) was modified with metal nanoparticles (gold, silver, and copper) in order to enhance its photoelectrochemical (PEC) and photocatalytic (PC) properties. SEM analysis revealed that Au, Ag, and Cu nanoparticles obtained on an ATO surface by chemical methods had an average diameter of 50 ± 10 nm, 30 ± 6 nm, and 25 ± 3 nm, respectively. Enhancement of photoelectrochemical water-splitting current efficiency in the wavelength range of 300–400 nm was observed due to the occurrence of the Schottky barriers. However, the nanoparticles had no effect on the current efficiency in the range of 400–600 nm which meant that the surface plasmon resonance (SPR) effect was not observed. A rate of methyl red photodecomposition was improved after the modification of the ATO surface. The best results were obtained for ATO decorated with gold nanoparticles.

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Radtke, Aleksandra, Marlena Grodzicka, Michalina Ehlert, Tadeusz Muzioł, Marek Szkodo, Michał Bartmański, and Piotr Piszczek. "Studies on Silver Ions Releasing Processes and Mechanical Properties of Surface-Modified Titanium Alloy Implants." International Journal of Molecular Sciences 19, no. 12 (December 9, 2018): 3962. http://dx.doi.org/10.3390/ijms19123962.

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Dispersed silver nanoparticles (AgNPs) on the surface of titanium alloy (Ti6Al4V) and titanium alloy modified by titania nanotube layer (Ti6Al4V/TNT) substrates were produced by the chemical vapor deposition method (CVD) using a novel precursor of the formula [Ag5(O2CC2F5)5(H2O)3]. The structure and volatile properties of this compound were determined using single crystal X-ray diffractometry, variable temperature IR spectrophotometry (VT IR), and electron inducted mass spectrometry (EI MS). The morphology and the structure of the produced Ti6Al4V/AgNPs and Ti6Al4V/TNT/AgNPs composites were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Moreover, measurements of hardness, Young’s modulus, adhesion, wettability, and surface free energy have been carried out. The ability to release silver ions from the surface of produced nanocomposite materials immersed in phosphate-buffered saline (PBS) solution has been estimated using inductively coupled plasma mass spectrometry (ICP-MS). The results of our studies proved the usefulness of the CVD method to enrich of the Ti6Al4V/TNT system with silver nanoparticles. Among the studied surface-modified titanium alloy implants, the better nano-mechanical properties were noticed for the Ti6Al4V/TNT/AgNPs composite in comparison to systems non-enriched by AgNPs. The location of silver nanoparticles inside of titania nanotubes caused their lowest release rate, which may indicate suitable properties on the above-mentioned type of the composite for the construction of implants with a long term antimicrobial activity.

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Fernández, Raquel, Junkal Gutierrez, Arantxa Eceiza, and Agnieszka Tercjak. "Hybrid materials based on azopolymer and sol–gel synthesized silver-containing titanium oxide nanoparticles with photoinduced birefringence." RSC Adv. 5, no. 20 (2015): 15740–48. http://dx.doi.org/10.1039/c4ra15075a.

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A strategy for the development of novel nanocomposite films based on azopolymer and sol–gel synthesized silver-containing titanium oxide nanoparticles with different photoinduced birefringent properties is reported.

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Choi, Soo-Hyoen, Yong-Seok Jang, Jong-Hwa Jang, Tae-Sung Bae, Sook-Jeong Lee, and Min-Ho Lee. "Enhanced antibacterial activity of titanium by surface modification with polydopamine and silver for dental implant application." Journal of Applied Biomaterials & Functional Materials 17, no. 3 (July 2019): 228080001984706. http://dx.doi.org/10.1177/2280800019847067.

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Background: Biofilm formation and microbial colonization on the surface of implant devices may cause dental caries and peri-implantitis. Therefore, various surface treatments have been developed to improve the antibacterial activity of titanium implant. Methods: Silver-loaded polydopamine coating was formed by immersing pure titanium in dopamine hydrochloride/HCl buffer solution for 24 h in 50 mL silver nitrate solutions with different concentrations for 30 min. Microbial growth inhibition and microbial growth curve analyses for bacterial solutions of Streptococcus mutans and Porphyromonas gingivalis incubated with the specimens were respectively conducted by counting the numbers of colonies on agar solid medium and by measuring absorbance using enzyme-linked immunosorbent assay reader. Results: Silver nanoparticles were uniformly distributed over the whole surface of the polydopamine and silver-coated titanium specimens. The numbers of microbial colonies for both bacteria cultured with surface-modified titanium were significantly lower than those cultured with uncoated titanium. When Streptococcus mutans and Porphyromonas gingivalis were cultured with surface-modified titanium, the lag phase of the growth curves for both bacteria was continually maintained, whereas the lag phase for Streptococcus mutans and Porphyromonas gingivalis changed to exponential phase after 9 and 15 h, respectively, when both bacteria were cultured with uncoated titanium. Conclusion: It was confirmed that the coating of polydopamine and silver on the surface of titanium effectively retards the microbial growth, which can cause the formation of biofilm and pathogenesis of gum disease in the mouth.

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No, Jung-Won, Dong-Hyun Kim, Min-Jae Lee, Duck-Hyun Kim, Tae-Hun Kim, and A.-Young Sung. "Preparation and Characterization of Ophthalmic Lens Materials Containing Titanium Silicon Oxide and Silver Nanoparticles." Journal of Nanoscience and Nanotechnology 15, no. 10 (October 1, 2015): 8016–22. http://dx.doi.org/10.1166/jnn.2015.11240.

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Hydrogel ophthalmic lenses containing fluorine-substituted aniline group, titanium silicon oxide nanoparticles, and silver nanoparticles were copolymerized, and the physical and optical properties of the hydrogel lenses were measured. To produce the hydrophilic ophthalmic lenses, the additives were added to the mixture containing HEMA, NVP, MA, EGDMA, and AIBN. The cast mold method was used for the manufacture of the hydrogel ophthalmic lenses, and the produced lenses were completely soaked in a 0.9% NaCl normal saline solution for 24 hours for hydration. The physical properties of the produced macromolecule showed that the water content was 32.5–37.6%, the refractive index was 1.450–1.464, the UV-B transmittance was 0.5–35.2%, and the contact angle was between 56 and 69°. Also, the addition of aniline, titanium silicon oxide, and silver nanoparticles allowed the ophthalmic lenses to block UV. These results show that the produced macromolecule can be used as hydrophilic lenses for ophthalmologic purposes that can block UV.

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Barone, P., F. Stranges, M. Barberio, D. Renzelli, A. Bonanno, and F. Xu. "Study of Band Gap of Silver Nanoparticles—Titanium Dioxide Nanocomposites." Journal of Chemistry 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/589707.

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The optical and chemical properties of Ag/TiO2nanocomposites were investigated to explore the possibilities of incorporating these new materials in Gratzel photoelectrochemical cells. The nanocomposites were obtained doping TiO2, in both allotropic species anatase and rutile, with silver nanoparticles (grown by laser ablation process). X-ray photoelectron data indicate the absence of Ag-Ti chemical bonds, while measurements of photoluminescence and optical absorbance in UV-visible range show a quench in photoluminescence emission of about 50% and an increase in visible absorbance of about 20%. Measurements of optical band gap, obtained by Tauc’s equation, indicate a variation of about 1.6 eV.

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Preclíková, Jana, Pavel Galář, František Trojánek, Bohuslav Rezek, Yvonne Němcová, and Petr Malý. "Photoluminescence of nanocrystalline titanium dioxide films loaded with silver nanoparticles." Journal of Applied Physics 109, no. 8 (April 15, 2011): 083528. http://dx.doi.org/10.1063/1.3573486.

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Preclíková, J., F. Trojánek, P. Němec, and P. Malý. "Multicolour photochromic behaviour of silver nanoparticles in titanium dioxide matrix." physica status solidi (c) 5, no. 11 (November 2008): 3496–98. http://dx.doi.org/10.1002/pssc.200779408.

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Niño-Martínez, N., G. A. Martínez-Castañón, A. Aragón-Piña, F. Martínez-Gutierrez, J. R. Martínez-Mendoza, and Facundo Ruiz. "Characterization of silver nanoparticles synthesized on titanium dioxide fine particles." Nanotechnology 19, no. 6 (January 23, 2008): 065711. http://dx.doi.org/10.1088/0957-4484/19/6/065711.

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Frolov, Georgiy Aleksandrovich, Irina Aleksandrovna Lundovskikh, Marina Robertovna Shabalina, Mikhail Borisovich Tarasov, Ivan Petrovich Pogorelskiy, Konstantin Igorevich Gurin, and Aleksandr Viktorovich Mironin. "Morphofunctional changes in Bacillus cereus cells under the influence of nanoparticles of metals and metal oxides." Disinfection affairs, no. 4 (December 2020): 5–18. http://dx.doi.org/10.35411/2076-457x-2020-4-5-18.

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The results are presented of the comparative study of the presence of characteristic features of disorders of the microstructural organization of the test strain B. cereus ATCC 10702 cells by stable nanoparticles of silver, gold, platinum, zinc oxide and titanium dioxide with loss of cell viability during their interaction with nanoparticles in an aqueous medium using methods of bacteriology and electron microscopy. General size-dependent features of the effect of nanoparticles on B. cereus ATCC 10702 cells and differences associated with both the adsorption of metal oxide and noble metal nanoparticles on the surface of bacteria and the loss of viability of bacterial cells with different levels of their destruction, reaching 67-70 % in the case of nanoparticles noble metals, were found. The chemistry of the effects of silver, gold, platinum and zinc and titanium oxides nanoparticles on the test microbe B. cereus ATCC 10702 is considered. The assumption is made that the main feature of the interaction of nanodispersed structures based on noble metals and metal oxides is not associated with an increase in the specific contact surface of the dispersed phase, but with a significant increase in the specific surface energy, which leads to the modification of the multilayer hydrated water shells surrounding nanoparticles. The measured zeta (ζ-)-potential of metal and metal oxides nanoparticles characterizes the total effect formed on the diffusion-mobile boundary of the nanoparticle; its value is a quantitative characteristic of the equilibrium energy state of dispersed systems acting as biocatalysts of intracellular enzymes and causing hydrolysis of the polymer structures of cytoplasmic membranes and cell membranes and ultimately the death of microbial cells. The obtained experimental data can be used in creation effective antimicrobial compositions.

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Freidoonimehr, Navid, Behnam Rostami, and Mohammad Mehdi Rashidi. "Predictor homotopy analysis method for nanofluid flow through expanding or contracting gaps with permeable walls." International Journal of Biomathematics 08, no. 04 (June 22, 2015): 1550050. http://dx.doi.org/10.1142/s1793524515500503.

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In this paper a definitely new analytical technique, predictor homotopy analysis method (PHAM), is employed to solve the problem of two-dimensional nanofluid flow through expanding or contracting gaps with permeable walls. Moreover, comparison of the PHAM results with numerical results obtained by the shooting method coupled with a Runge–Kutta integration method as well as previously published study results demonstrates high accuracy for this technique. The fluid in the channel is water containing different nanoparticles: silver, copper, copper oxide, titanium oxide, and aluminum oxide. The effects of the nanoparticle volume fraction, Reynolds number, wall expansion ratio, and different types of nanoparticles on the flow are discussed.

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Aamir, Muhammad, Riaz Muhammad, Majid Tolouei-Rad, Khaled Giasin, and Vadim V. Silberschmidt. "A review: microstructure and properties of tin-silver-copper lead-free solder series for the applications of electronics." Soldering & Surface Mount Technology 32, no. 2 (October 14, 2019): 115–26. http://dx.doi.org/10.1108/ssmt-11-2018-0046.

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Purpose The research on lead-free solder alloys has increased in past decades due to awareness of the environmental impact of lead contents in soldering alloys. This has led to the introduction and development of different grades of lead-free solder alloys in the global market. Tin-silver-copper is a lead-free alloy which has been acknowledged by different consortia as a good alternative to conventional tin-lead alloy. The purpose of this paper is to provide comprehensive knowledge about the tin-silver-copper series. Design/methodology/approach The approach of this study reviews the microstructure and some other properties of tin-silver-copper series after the addition of indium, titanium, iron, zinc, zirconium, bismuth, nickel, antimony, gallium, aluminium, cerium, lanthanum, yttrium, erbium, praseodymium, neodymium, ytterbium, nanoparticles of nickel, cobalt, silicon carbide, aluminium oxide, zinc oxide, titanium dioxide, cerium oxide, zirconium oxide and titanium diboride, as well as carbon nanotubes, nickel-coated carbon nanotubes, single-walled carbon nanotubes and graphene-nano-sheets. Findings The current paper presents a comprehensive review of the tin-silver-copper solder series with possible solutions for improving their microstructure, melting point, mechanical properties and wettability through the addition of different elements/nanoparticles and other materials. Originality/value This paper summarises the useful findings of the tin-silver-copper series comprehensively. This information will assist in future work for the design and development of novel lead-free solder alloys.

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Trejo-Tzab, R., JA Aguilar-Jiménez, P. Quintana-Owen, Alejandro Ávila-Ortega, MA Alvarez-Lemus, and RA Medina-Esquivel. "One-step nitrogen plasma process for bimetallic impregnation to obtain N-TiO2−X/Au/Ag composite." Nanomaterials and Nanotechnology 10 (January 1, 2020): 184798042090542. http://dx.doi.org/10.1177/1847980420905426.

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The main motivation of this work is to deposit two different metals (gold and silver) on titanium oxide nanoparticles surface in a one-step simple and fast physical process by applying a nitrogen plasma as the main source of nitrogen atoms to obtain nanostructured N-TiO2 − X/Au/Ag materials. The obtained nanomaterials were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, diffuse reflectance spectroscopy, scanning electron microscopy–energy dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy. Based on the characterization results, we found that gold and silver nanoparticles were uniformly loaded on the titanium oxide nanocomposite surface, showing a surface plasmon absorption band due to the loading of the metal nanoparticles over titania samples. The results of this work have shown that nitrogen plasma technique is a more feasible and simple alternative to obtain the N-TiO2 − X/Au/Ag nanocomposite. Moreover, this plasma technique could be used to impregnate with other kind of metals over the surface of diverse nanomaterials.

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Chinthaparthi, Mallikarjuna Reddy, M. Hima Bindu, and Chandana Bandlapalli. "Antibacterial effect of titanium dioxide with or without silver as additive on staphylococcus aureus from clinical samples." Indian Journal of Microbiology Research 8, no. 2 (July 15, 2021): 108–11. http://dx.doi.org/10.18231/j.ijmr.2021.021.

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Antibiotic resistance has now become a perpetual global problem due to the emergence and reemergence of old and new multiresistant bacteria that there is a constant need of newer drugs to combat this phenomenon. Nanoparticles are now considered for their antibacterial effect and those such as Titanium dioxide have a good mechanical properties and biocompatibility, especially being non toxic to human skin and cost effective. This study was done to show the antibacterial effect of Titanium dioxide with and without Silver as addendum on Staphylococcus aureus strains from clinical samples. Staphylococcus aureus isolated from various clinical samples was inoculated onto peptone water and further inoculated onto glass slides coated with TiO2 annealed at 200C, 400C and onto TiO2 with 0.1%, 0.3%, 0.6% and 0.8% silver as additive at 1 hour intervals each. The growth was observed after 18 hours of incubation. The highest antibacterial effect was observed within 2 hours of treatment with 0.8% Ag on TiO2 nanoparticles, while it took longer with the other concentrations of silver. With TiO2 and 0.1% Ag, it took at least 7 hours of treatment for complete antibacterial effect though within the first hour itself the effect was observed. Though TiO2 nanoparticles in pure form have significant antibacterial effect, there is a considerable increase in its antibacterial effect when silver is added as an additive, with higher concentrations of Ag having more effect.

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Capellato, Patrícia, Cláudia Eliana Bruno Marino, Gilbert Silva, Lucas Victor Benjamim Vasconcelos, Rodrigo Perito Cardoso, Kayam Hamdar, and Daniela Sachs. "Surface treatment with silver particles isles on Titanium cp: study of antimicrobial activity." Research, Society and Development 9, no. 4 (March 12, 2020): e27942662. http://dx.doi.org/10.33448/rsd-v9i4.2662.

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During the last decades, researchers have been growing the interest in surface treatment with an antimicrobial agent. Silver nanoparticles (AgNPs) are widely used in biomedical fields due to their potent antimicrobial activity. So, in this study was investigated silver particles (isles) coated on titanium surface for dental and orthopedic application. Silver particles coating process on titanium surface were performed via sputtering that is a plasma-assisted deposition technique with and titanium without treatment was applied as comparing standard. Plasma treatment parameters were optimized so that the result was not a thin film of Ag but dispersed particles of Ag on the Ti-cp surface. The alloy surfaces were investigated using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). In order to investigate antibacterial potential Staphylococcus aureus and Escherichia coli have been used at Agar diffusion assay. The results were analyzed by analysis of variance (ANOVA) in order to verify significant difference antimicrobial activity between samples that have shown no difference between the surfaces studied treatments. For silver deposition scattered particles (isles) over titanium surface for a 10-minute treatment, EDS revealed by silver clusters that the particles were not properly scattered onto surface, hence, the low effectiveness in antibacterial activity.

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Vemula, Rajesh, A. J. Chamkha, and Mallesh M. P. "Nanofluid flow past an impulsively started vertical plate with variable surface temperature." International Journal of Numerical Methods for Heat & Fluid Flow 26, no. 1 (January 4, 2016): 328–47. http://dx.doi.org/10.1108/hff-07-2014-0209.

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Purpose – The purpose of this paper is to focus on the numerical modelling of transient natural convection flow of an incompressible viscous nanofluid past an impulsively started semi-infinite vertical plate with variable surface temperature. Design/methodology/approach – The problem is governed by the coupled non-linear partial differential equations with appropriate boundary conditions. A robust, well-tested, Crank-Nicolson type of implicit finite-difference method, which is unconditionally stable and convergent, is used to solve the governing non-linear set of partial differential equations. Findings – The local and average values of the skin-friction coefficient (viscous drag) and the average Nusselt number (the rate of heat transfer) decreased, while the local Nusselt number increased for all nanofluids, namely, aluminium oxide-water, copper-water, titanium oxide-water and silver-water with an increase in the temperature exponent m. Selecting aluminium oxide as the dispersing nanoparticles leads to the maximum average Nusselt number (the rate of heat transfer), while choosing silver as the dispersing nanoparticles leads to the minimum local Nusselt number compared to the other nanofluids for all values of the temperature exponent m. Also, choosing silver as the dispersing nanoparticles leads to the minimum skin-friction coefficient (viscous drag), while selecting aluminium oxide as the dispersing nanoparticles leads to the maximum skin-friction coefficient (viscous drag) for all values of the temperature exponent m. Research limitations/implications – The Brinkman model for dynamic viscosity and Maxwell-Garnett model for thermal conductivity are employed. The governing boundary layer equations are written according to The Tiwari-Das nanofluid model. A range of nanofluids containing nanoparticles of aluminium oxide, copper, titanium oxide and silver with nanoparticle volume fraction range less than or equal to 0.04 are considered. Practical implications – The present simulations are relevant to nanomaterials thermal flow processing in the chemical engineering and metallurgy industries. This study also provides an important benchmark for further simulations of nanofluid dynamic transport phenomena of relevance to materials processing, with alternative computational algorithms (e.g. finite element methods). Originality/value – This paper is relatively original and illustrates the influence of variable surface temperature on transient natural convection flow of a viscous incompressible nanofluid and heat transfer from an impulsively started semi-infinite vertical plate.

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Nie, Wanyi, Robert C. Coffin, and David L. Carroll. "Silver Nanoparticle-Doped Titanium Oxide Thin Films for Intermediate Layers in Organic Tandem Solar Cell." International Journal of Photoenergy 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/829463.

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In this work we investigate the Ag nanoparticle doping of TiOx used as an intermediate layer between subcells of a tandem organic photovoltaic. We use a model polymer cell structure of P3HT:TiOx:PEDOT:P3HT to observe charge-trapping effects as a function of nanoparticle content in the TiOx, as determined by the shape of the dark and illuminated current voltage curves of the devices. There is a direct correlation between the amount of Ag nanoparticles in the TiOx, and interfacial charge buildup, and charge trapping being completely mitigated at around 0.2% mol. This suggests that such doping schemes might provide a simple approach to the creation and use of TiOx layers for tandem cells.

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Haghighat, Fatemeh, Younghun Kim, Iman Sourinejad, Il Je Yu, and Seyed Ali Johari. "Titanium dioxide nanoparticles affect the toxicity of silver nanoparticles in common carp (Cyprinus carpio)." Chemosphere 262 (January 2021): 127805. http://dx.doi.org/10.1016/j.chemosphere.2020.127805.

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Hinojosa-Reyes, Mariana, Roberto Camposeco-Solís, Facundo Ruiz, Nereyda Niño Martínez, Vicente Rodríguez González, and M. E. Compeán-Jasso. "H2Ti3O7 Nanotubes Decorated with Silver Nanoparticles for Photocatalytic Degradation of Atenolol." Journal of Nanomaterials 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/9610419.

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The photocatalytic degradation/adsorption process of the β-blocker atenolol (ATL) under UV irradiation is described using two types of silver decorated catalysts: silver/titania and silver/titanates. The silver ions were reduced on the surface of TiO2-P25-Degussa using gallic acid. Silver/titanates were prepared by a microwave-assisted hydrothermal method using the silver/titania as the starting material to obtain the hydrogen titanate (H2Ti3O7) structure with tubular morphology. These materials were characterized by X-ray diffraction, UV-Vis spectroscopy, N2 physisorption, temperature programmed reduction, TEM, and FTIR spectroscopy. During the photocatalytic process, the ATL molecules were completely converted to amino-diol byproducts. It is the first time that these materials have been applied during the photocatalytic process in the degradation of pharmaceuticals products. The success of the silver nanoparticles (2 nm) consists of the homogeneous distribution over the surface of titanate nanotubes inhibiting the hole/electron recombination promoting the oxidation process. The Ag@H2Ti3O7 with a concentration of silver as 1.0% shows the highest adsorption/degradation of ATL than the Ag@TiO2 and the P25-Degussa. The great performance in the reuse test consists in the strong attachment of the silver nanoparticles on the titanium surface that inhibits the silver lixiviation during the photocatalytic tests.

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Rehman, Suriya, Rabindran Jermy, Sarah Mousa Asiri, Manzoor A. Shah, Romana Farooq, Vijaya Ravinayagam, Mohammad Azam Ansari, et al. "Using Fomitopsis pinicola for bioinspired synthesis of titanium dioxide and silver nanoparticles, targeting biomedical applications." RSC Advances 10, no. 53 (2020): 32137–47. http://dx.doi.org/10.1039/d0ra02637a.

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This study proposes a bio-directed approach for the formation of titanium oxide and silver nanoparticles (TiO₂ and Ag NPs), using a wild mushroom, Fomitopsis pinicola, identified by 18S ribosomal RNA gene sequencing (gene accession no. MK635350) and phenotypic examination.

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Journal articles on the topic 'Silver-titanium nanoparticles'

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