Papers by Keyword: Silver

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Authors: Yi Kai Chen, Xue Bin Zheng, Baoe Li, You Tao Xie, Chuan Xian Ding, Soo Wohn Lee
Abstract: In this paper, antibacterial silver-containing hydroxyapatite coating was prepared by vacuum plasma spraying method and osteoblasts were seeded onto the surface of the coating to evaluate its cytocompatibility. The results indicated that the cells proliferated well on the samples, and the proliferation rate on the silver-containing hydroxyapatite coating was a little bit higher than that on the silver-free hydroxyapatite coating. The contact angle of water drop on the coating was measured, and it was found that the contact angles of the silver-containing hydroxyapatite coatings were smaller than the hydroxyapatite coating. The improvement of hydrophilicity for the silver-containing hydroxyapatite coating could be beneficial to the cells proliferation on its surface. It can be concluded that the addition of silver in the hydroxyapatite coating endowed the coating with antibacterial property while maintaining its excellent cytocompatibility.
Authors: Yu Li Shi, Qi Zhou, Li Yun Lv, Wang Hong
Abstract: A facile method for the synthesis of silver nanoparticles (NPs) has been developed by using sodium phosphate (Na3PO4) as stabilizing agents and glucose the reducing agent, respectively. The obtained silver NPs have been characterized by X-ray diffraction (XRD), UV-visible spectroscopy (UV-vis) and transmission electron microscopy (TEM). It was found that in the presence of sodium phosphate, silver NPs with different morphologies and sizes were obtained. The formation mechanism of diverse silver NPs was studied preliminarily.
Authors: Rita Najjar, Salim Boutami, Cyril Cayron, Nathalie Baclet, Viviane Muffato, Pierre Labeye, Alistair Kean, Sirina Saranu, Etienne Quesnel
Abstract: Silver nanoparticles have been prepared using a “terminated gas condensation” technique. An unprecedented control of 5-6 nm-size nanoparticles with well defined shape and variable surface densities has been achieved. The technology is shown to permit independent control of both, plasmon resonance intensity and frequency position. On the basis of optical measurements, a smart tuning of plasmon resonance intensity with particle density is indeed demonstrated. Moreover, the embedding of NPs in different surrounding medium enables to control the resonance wavelength as experimentally demonstrated and theoretically confirmed.
Authors: Jia Hai Ye, Zheng Hua Wang, Jian Liu
Abstract: A novel fluorescence probe was obtained by click reaction based on the materials of etraphenylethylene (TPE) and 8-hydroxyquinoline, which were used as fluorescent group and accepter group respectively. It displays high selectivity and sensitivity towards Ag+ and Fe3+ in THF-H2O(2:3, v/v) as they can form stable 2:1 metal-ligand complexes.
Authors: De Ling Chi, Kai Zhao, Zheng Xiao Liu, Fei Fei Zhang, Zong Hua Wang
Abstract: A novel silver-doped poly (p-aminobenzene sulfonic acid) modified electrode was fabricated, of which the electrochemical behaviors were studied with H2O2 as a probe. In pH 7.0 PBS, a sensitive reductive peak of H2O2 was observed. The modified electrode is of potential in practice for analysis of H2O2 in samples such as milk.
Authors: M. Bellantone, N.J. Coleman, Larry L. Hench
Authors: Yan Yang, Hai Tao Huang
Abstract: A simple method is described for preparing silver nanoparticles via photoreduction in layered laponite suspensions without any additional reduction agent or heat treatment. The properties of silver nanoparticles were studied as a function of the UV irradiation time. Transmission electron microscopy (TEM) was employed to study the variation of particle shape, size and size distribution. The crystal structure of silver nanoparticles was characterized powder Xray diffractometry (XRD). The optical absorption spectra of silver nanoparticles were obtained by ultraviolet-visible (UV-Vis) spectroscopy.
Authors: Cléo Thomás Gabriel Vilela Menegaz Teixeira Pires, Júlio César Perin de Melo, Claudio Airoldi
Abstract: Organofunctionalized phyllosilicates containing both amino and mercapto groups were synthesized and used as support for silver nanoparticles in situ deposition. Depending on silver concentration in relation to phyllosilicate different amount of nanoparticles size and distributions were obtained, even with smallest silver used causes strong exfoliation of the phylosilicate lamella. Also such condition favors nanoparticles formation with homogeneous distribution with smaller diameters and narrower particle particles size distributions. With highest silver amounts preferential external phyllosilicate surface crystallization is obtained, as given by particle diameters up to 30 nm. Scanning and transmission electron microscopies were successfully employed to characterize morphological and structural features for these synthesized materials, enabling atomic visualization for the silver nanoparticles. These new phyllosilicates containing silver nanoparticles are extensively employed to design inorganic light emission diodes and also in applying in biological fields.
Authors: I. Tomov
Abstract: Allowing for secondary extinction (SE), a method is described for thickness measurement of thin films by x-ray absorption. The method is tested by employing Al foils and electrodeposited Cu films detached by the substrate. The thicknesses determined by the method were in fair agreement with that ones measured by the ordinary absorption method based on using incident beam intensities. Moreover, a dependence of the SE coefficient on the transmission factor of the films was experimentally shown, and thus additional light was thrown on the nature of SE.
Authors: Yang Xu, Ji Chun Huang, Lin Cheng, Dian Xue Cao, Gui Ling Wang
Abstract: Co3O4 nanowire arrays freely standing on nickel foam are prepared via a template-free growth method,and it is doped by Ag via electrodeposition method (denoted as NWA-Ag/Co3O4,NWA represents Nanowire Arrays). The morphology of NWA-Ag/Co3O4 is examined by scanning electron microscopy. The phase structure of the NWA-Ag/Co3O4 electrode is characterized by X-ray diffraction spectroscopy. The supercapacitance behavior of the NWA-Ag/Co3O4 electrodes is investigated by cyclic voltammetry, galvanostatic charge/discharge test and electrochemical impedance spectroscopy. The results show that the nanowire arrays densely cover the nickel foam substrate and have diameters around 250 nm. The NWA-Ag/Co3O4 electrodes exhibit a specific capacitance of 1009 F g−1 at a current density of 5 mA cm-2 in 6.0 mol dm-3 KOH electrolyte. The capacitance loss is less than 6.5% after 500 charge/discharge cycles at 10 mA cm-2 and with columbic efficiency higher than 97.5%.
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