Journal articles: 'Metallic silver'

1

Valverde-Aguilar, Guadalupe, Jorge A. García-Macedo, and Víctor Rentería-Tapia. "Silver Core - Silver Oxide Shell Nanoparticles Embedded on Mesostructured Silica Films." Journal of Nano Research 3 (October 2008): 103–14. http://dx.doi.org/10.4028/www.scientific.net/jnanor.3.103.

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Metallic silver particles in the nanometer size range were obtained in SiO2 matrix by the reduction of AgNO3 with the non-ionic diblock copolymer (Brij 58). Hexagonal mesostructured sol-gel films were synthesized by dip-coating method using the surfactant Brij58 to produce channels into the film, which house the silver nanoparticles. Optical properties of the metallic nanoparticles were studied by UV-Vis spectroscopy, TEM and HRTEM images. The experimental absorption spectrum of the metallic silver nanoparticles exhibits an absorption band located at 438 nm and a shoulder at longer wavelength. The TEM images show randomly distributed silver nanoparticles (Type I) along with some oriented as long line (Type II). Both distributions exhibit a silver oxide shell around of them. The second shell covering the silver core - silver oxide shell system is related to the surfactant. The optical absorption spectrum was modelled using the Gans theory. The fit shows two main contributions related to metallic silver nanoparticles with different axial ratios, and surrounding of a dielectric medium with high refractive index. Presence of the high refractive index silver oxide shell was confirmed by X-ray diffraction technique. The contributions of silver core and silver oxide shell play important roles in the optical properties of the films.

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Fagerquist, Clifton K., Dilip K. Sensharma, and Mostafa A. El-Sayed. ""Mixed" metallic-ionic clusters of silver/silver iodide." Journal of Physical Chemistry 95, no. 23 (November 1991): 9169–75. http://dx.doi.org/10.1021/j100176a026.

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Zhao, Dong Lin, Xia Li, Wei Dong Chi, and Zeng Min Shen. "Formation Mechanism and Microwave Permittivity of Carbon Nanotubes Filled with Metallic Silver Nanowires." Key Engineering Materials 334-335 (March 2007): 685–88. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.685.

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The filling of multi-walled carbon nanotubes (MWNTs) with metallic silver nanowires via wet chemistry method was investigated. The carbon nanotubes were filled with long continuous silver nanowires. The carbon nanotubes were almost opened and cut after being treated with concentrated nitric acid. Silver nitrate solution filled carbon nanotubes by capillarity. Carbon nanotubes were filled with silver nanowires after calcinations by hydrogen. The diameters of silver nanowires were in the range of 20-40nm, and lengths of 100nm-10μm. We studied the micromorphology of the silver nanowires filled in carbon nanotubes by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Based on the experimental results, a formation mechanism of the Ag nanowire-filled carbon nanotubes was proposed. And the microwave permittivity of the carbon nanotubes filled with metallic silver nanowires was measured in the frequency range from 2 GHz to 18 GHz. The loss tangent of the carbon nanotubes filled with metallic silver nanowires is high. So the carbon nanotubes filled with metallic silver nanowires would be a good candidate for microwave absorbent.

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Zarbov, Martin, David Brandon, Leah Gal-Or, and Nissim Cohen. "EPD of Metallic Silver Particles: Problems and Solutions." Key Engineering Materials 314 (July 2006): 95–100. http://dx.doi.org/10.4028/www.scientific.net/kem.314.95.

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Cerel has devoted the past several years to the development of prototype microcomponents for the electronics industry based on EPD processing. The present contribution summarizes some problems Cerel has experienced in the integration of EPD for metallic silver particles into a viable production process. In particular, the parameters that need to be controlled due to the metallic nature of the silver particles have been analyzed. Selection of a metallic silver powder suitable for EPD is the key factor. An appropriate particle size and shape, as well as a controlled size distribution, significantly improves the green density of the deposit. Metallic silver particles in a suspension tend to aggregate, especially when exposed to an electric field. This leads to premature sedimentation, as well as low green densities for the electrophoretic deposit. The following factors were found to contribute significantly to preventing premature sedimentation: • The replacement of pure silver by palladium-coated silver particles. • Dispersion preparation in a high viscosity medium of low dielectric constant. • The presence of steric, electrosteric and ceramic oxide additives in the siver powder dispersion. Finally, control of the solids loading and particle size distribution in the suspension, and the geometrical design of the EPD cell, including the counter-electrodes, were also shown to be important for the successful electrophoretic deposition of silver particles in the commercial production of micro-components by EPD.

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Yudha S, Salprima, Aswin Falahudin, Morina Adfa, Irfan Gustian, and Herlina Herlina. "Light-induced synthesis of micron-sized metallic silver in aqueous extract of Rivina humilis L. fruits and its interaction with Corptotermes curvignathus." Molekul 16, no. 2 (July 20, 2021): 170. http://dx.doi.org/10.20884/1.jm.2021.16.2.740.

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The aqueous extract of Rivina humilis was suitable to reduce silver ions (Ag+) to form micron-sized metallic silver at room temperature and without any addition of external reducing agent or stabilizer compounds. The reduction process was assisted by light, indicated by the colour change of the reaction mixture and supported by the appearance of peak at 455 nm in spectrophotometric analysis when the reaction was carried out under room light. Based on transmission electron microscopy (TEM) analysis, the as-prepared metallic silver was in spherical form. The analysis results using particles size analyzer (PSA) show their particles distribution from micro to nano size (average size was 199 nm). The interaction behaviour of micron-sized metallic silver/extract solution with Corptotermes curvignathus termites shows that the silver gives small additional effects along with the activity of the extract.

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swathy, Bekkeri. "A Review on Metallic Silver Nanoparticles." IOSR Journal of Pharmacy (IOSRPHR) 4, no. 7 (2014): 38–44. http://dx.doi.org/10.9790/3013-0407038044.

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Gromov, O. G., Yu A. Savel’ev, G. B. Kunshina, E. P. Lokshin, S. A. Mastyugin, and V. T. Kalinnikov. "Manufacturing metallic silver from its chalcogenides." Russian Journal of Applied Chemistry 86, no. 6 (June 2013): 807–10. http://dx.doi.org/10.1134/s1070427213060037.

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8

Bleaney, B. "Dynamic nuclear polarisation in metallic silver." Applied Magnetic Resonance 17, no. 4 (July 1999): 519–20. http://dx.doi.org/10.1007/bf03162083.

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9

Williams, D. F. "Biocompatibility of metallic gold and silver." Journal of Inorganic Biochemistry 42, no. 4 (June 1991): 296. http://dx.doi.org/10.1016/0162-0134(91)84056-f.

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10

Liang, Jianghu, Yuyang Liu, and Xiaoyu Zhang. "Silver Metallic Cyclodextrin‐Core Star mPEG." Macromolecular Rapid Communications 40, no. 17 (December 18, 2018): 1800562. http://dx.doi.org/10.1002/marc.201800562.

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11

Danscher, Gorm, and Linda Jansons Locht. "In vivo liberation of silver ions from metallic silver surfaces." Histochemistry and Cell Biology 133, no. 3 (December 24, 2009): 359–66. http://dx.doi.org/10.1007/s00418-009-0670-5.

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12

Wang, Kun, Gao-Yan Duan, Pei-Lin Lang, Yu-Fang Zhao, Jian-Bin Liu, and Gang Song. "Biosensor based on plasmonic Mach-Zehnder interferometer with metallic gratings." Acta Physica Sinica 71, no. 1 (2022): 017301. http://dx.doi.org/10.7498/aps.71.20211420.

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In this paper, a Mach-Zehnder interferometric sensing structure based on silver nanochains of surface plasmons is optimized. The structure consists of a reference arm, a sensing arm and a nanowire waveguide. Nanowire waveguides are composed of silicon nanowires wrapped with a certain thickness of silver. Introduce two silver nanochains as the reference arm and the sensing arm of the Mach-Zehnder interferometer. And research the transmission characteristics of the designed structure. Improve the accuracy and sensitivity of the designed structure by reducing the transmission loss. Compared with two identical silver nanowires as the reference arm and the sensing arm. After the reference arm and the sensing arm are changed to silver nanochains, the transmission characteristics are significantly improved, and the loss per unit length is obviously reduced. This is because the long-range or coulomb interaction between the unit structures of the silver nano-chains enhances the electromagnetic field in the structure, thereby reducing the transmission loss. We set the lattice constants of the two silver nanochains to different situations. The study found that under the wider width of silicon-coated silver nanowires and certain duty ratios. The unit transmission loss of a structure containing asymmetric silver nanochains is smaller than that of a structure containing symmetric silver nanochains. It can be known that silver nanoparticle chains with small loss can compensate for the transmission loss of silver nanoparticle chains with large loss. Using this feature, we further optimized the design structure and changed one side of the silver nano-chain to nano-wire. Change the lattice constant and duty cycle of the silver nanochain on the other side. We have found that in most cases, this type of structure has better transmission characteristics than a structure containing two silver nanochains and a structure containing two silver nanowires. Our design structure can greatly reduce the transmission loss of the traditional Mach-Zehnder interferometer. Moreover, the fault tolerance rate is high in the preparation process of the structure. It has huge potential application value in practical application.

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Furko, M., M. Lakatos-Varsányi, and Csaba Balázsi. "Comparative Corrosion Study on Silver Coated Metallic Implants." Materials Science Forum 812 (February 2015): 327–32. http://dx.doi.org/10.4028/www.scientific.net/msf.812.327.

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Nanostructured silver layer was deposited by pulse current technique onto three different implant materials-TiAl6V4, CoCrMo alloy and stainless steel–that are commonly used in orthopedic surgery. The electrochemical behavior of the coatings in isotonic salt solution was investigated by potentiodynamic polarization measurements over a period of several weeks. The corrosion properties of silver coated different implant materials were compared. Degradation of silver coatings have been traced and confirmed by different methods such as scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) measurements.

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14

Sulaeman, Uyi, Suhendar Suhendar, Hartiwi Diastuti, Roy Andreas, and Shu Yin. "Design of Defect and Metallic Silver in Silver Phosphate Photocatalyst Using the Hydroxyapatite and Glucose." Indonesian Journal of Chemistry 20, no. 6 (July 17, 2020): 1441. http://dx.doi.org/10.22146/ijc.48647.

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The defect and metallic silver (Ag) in silver phosphate (Ag3PO4) photocatalyst were successfully generated using hydroxyapatite (HA) and glucose. Two steps of synthesis were done in these experiments. Firstly, the Ag/HA powder was prepared by reacting AgNO3 and HA, followed by the addition of a glucose solution. Secondly, the suspension of Ag/HA was reacted with AgNO3 aqueous solution. The yellow product of Ag/Ag3PO4 photocatalyst was produced. The products were characterized using X-Ray Diffraction (XRD), Diffuse Reflectance Spectroscopy (DRS), Scanning Electron Microscope (SEM), Brunauer–Emmett–Teller (BET) and X-ray Photoelectron Spectroscopy (XPS). The decreased ratio of O/Ag and metallic Ag formation observed by the XPS was detected as the possible defect and Ag-doping in the photocatalyst. The enhanced photocatalytic activity might be caused by the oxygen vacancy and metallic Ag in Ag3PO4 that enables the separation of photo-generated electrons and holes.

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15

Olteanu, Radu Lucian, Cristina Mihaela Nicolescu, Marius Bumbac, Ioana Daniela Dulama, Rodica Mariana Ion, and Ioana Raluca Suica Bunghez. "Study on Critical Micelle Concentration Influence in Green Synthesis of Silver Nanoparticles Assisted by Sapindus mukorossi Aqueous Extract." Revista de Chimie 69, no. 6 (July 15, 2018): 1339–45. http://dx.doi.org/10.37358/rc.18.6.6321.

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Silver nanoparticles synthesis mediated by plant extracts involves the colloidal stability of generated metallic particles in solutions. Formation of micelles in solutions influences the nanoparticle synthesis process and consequently, the surface plasmonic response (SPR) of the formed silver nanoparticles. Critical micelle concentration (CMC) of Sapindus mukorossi aqueous extract has been determined with ultraviolet-visible spectroscopy, two methods were used: dye micellization method, and correlation of silver nanoparticles SPR with the variation of surfactant concentration. Results obtained for CMC determination by the two methods were highly reproducible and in good correlation indicating that micelles formed by saponins present in the Sapindus mukorossi aqueous extract are useful as effective structure-driving agents to synthesize colloidal metallic nanoparticles, offering them proper growth conditions. Silver nanoparticles synthesis mixtures were studied, with Sapindus mukorossi aqueous extract and silver nitrates as precursors, in acidic and basic media, at room temperature to establish correlations between saponins structure modifications and surface plasmonic response of metallic nanoparticles. Light absorption spectrometric techniques (ultraviolet-visible and infrared), X-ray diffraction and scanning electron microscopy were used to characterize the synthesis process.

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Freeman, Amihay, Yael Dror, Carmit Ophir Porat, Noa Hadar, and Yossi Shacham Diamand. "Silver-Coated Biologically Active Protein Hybrids: Antimicrobial Applications." Applied Mechanics and Materials 749 (April 2015): 453–56. http://dx.doi.org/10.4028/www.scientific.net/amm.749.453.

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Novel hybrids, comprised of a biologically active protein molecule core, coated with a thin outer layer of porous metallic silver, were developed in our lab. By the conjugation of silver reducing polymer to the surface of soluble, molecular, biologically active protein molecules and subsequent addition of silver salt, electroless silver deposition, culminating in thin porous metallic coating, was directed to the surface of the protein molecules. The silver-protein hybrids thus obtained, presenting novel nanoparticles several nanometers in size, retained their solubility and biological activity.The silver coating combined with the retained biological activity of its protein core, paved the way to a series of biomedical applications of these hybrids including "wiring" of the active site of oxido-reductase enzyme to electrodes, imaging of the presence of targeted ligands displayed on cancer cell surface and antimicrobial enzymatically attenuated release of silver ions.In this presentation we shall overview the technology of protein-silver hybrid's fabrication and analytical applications of silver-glucose oxidase and silver-Avidin hybrids, followed by feasibility demonstration of using silver-glucose oxidase hybrid as novel antibacterial and antifungal agent.

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Bogdanov, An A., S. V. Shmakov, N. A. Verlov, V. V. Klimenko, N. A. Knyazev, I. N. Terterov, and A. A. Bogdanov. "Investigation of the cytotoxicity of silver nitrate and silver-cysteine nanocomplexes." Journal of Physics: Conference Series 2086, no. 1 (December 1, 2021): 012108. http://dx.doi.org/10.1088/1742-6596/2086/1/012108.

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Abstract Currently, a large number of studies are devoted to the investigation of the antitumor activity of silver nanoparticles and compounds, one of which is silver nitrate. However, silver nitrate has systemic and local toxic effects. In this work, a method was proposed for the synthesis of non-metallic complexes that do not contain toxic nitrate ions, and the cytotoxicity of silver nitrate and silver-amino acid nanocomplexes was investigated.

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Akter, S., MB Hossain, S. Akter, T. Hasan, and AU Mahmud. "Comparative Efficacy of Silver Metallic Plastic Mulch, Botanicals and Insecticides in Controlling Tomato Yellow Leaf Curl Disease." SAARC Journal of Agriculture 18, no. 2 (January 4, 2021): 77–86. http://dx.doi.org/10.3329/sja.v18i2.51110.

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Tomato Yellow Leaf Curl caused by Tomato Yellow Leaf Curl Virus (TYLCV) is one of the most important diseases of tomato causing heavy losses in yield and quality of fruits. Damage caused through phloem feeding and transmission of TYLCV by the insect vectors whitefly (Bemisiatabaci). In this study the competence of silver metallic plastic mulch, botanicals and insecticides were assessed to manage the Tomato Yellow Leaf Curl Virus (TYLCV) by controlling the insect vectors. In total 7 treatments including control were considered viz. T1=Imidacloprid, T2= ACmix, T3= Subicron, T4= Neemax, T5= Multineem, T6 = Silver metallic plastic mulch and T7= Control. All the treatments showed significant influence on different assayed parameters in the test crop tomato. The lowest disease incidence, disease severity and whitefly association was found in T6 treatment (silver metallic plastic mulch) that was 2.87%, 1.72% and 2.0% at 60 days after transplanting (DAT) respectively. While the highest disease incidence, disease severity and whitefly association were found in T7 treatment (control treatment) that was 14.71%, 46.22% and 18, respectively, at 60 DAT. From the relationship study between disease incidence and disease severity with whitefly association, it was revealed that disease incidence and severity of TYLCV was increased with increasing of whitefly population and vice-versa. Among the treatments, growth parameters, yield and yield attributers were also found better in T6treatment (silver metallic plastic mulch). Silver metallic plastic mulch is the best option to manage the TYLCV by controlling the insect vectors, whitefly instead of insecticides. SAARC J. Agri., 18(2): 77-86 (2020)

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Tian, Zhong, Han Yan, Qing Peng, Lin Jay Guo, Shengjun Zhou, Can Ding, Peng Li, and Qi Luo. "Atomistic Insights into Aluminum Doping Effect on Surface Roughness of Deposited Ultra-Thin Silver Films." Nanomaterials 11, no. 1 (January 10, 2021): 158. http://dx.doi.org/10.3390/nano11010158.

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Ultra-thin and continuous metallic silver films are attracting growing interest due to the applications in flexible transparent conducting electrodes. The surface morphology and structure of silver film are very important for its electrical resistivity and optical loss. Therefore, roughness control is essential for the production of ultra-thin metallic electrode film. We have investigated the effect of aluminum doping on the improvement of surface morphology of ultra-thin silver films using molecular dynamics simulations. Al-doped silver films showed smaller surface roughness than pure silver films at various substrate temperatures. When the temperature of the substrate was 600 K, the roughness of Al-doped silver film first decreased, and then increased with the increase of the incident velocity of silver atoms. Silver atoms were more likely to agglomerate on the surface of the substrate after adding aluminum atoms, as aluminum dopants promoted the immobilization of silver atoms on SiO2 substrate due to the anchoring effect. The smoother surface could be attributable to the reduced mean free path of silver due to the cage effect by the aluminum dopant.

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Tian, Zhong, Han Yan, Qing Peng, Lin Jay Guo, Shengjun Zhou, Can Ding, Peng Li, and Qi Luo. "Atomistic Insights into Aluminum Doping Effect on Surface Roughness of Deposited Ultra-Thin Silver Films." Nanomaterials 11, no. 1 (January 10, 2021): 158. http://dx.doi.org/10.3390/nano11010158.

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Ultra-thin and continuous metallic silver films are attracting growing interest due to the applications in flexible transparent conducting electrodes. The surface morphology and structure of silver film are very important for its electrical resistivity and optical loss. Therefore, roughness control is essential for the production of ultra-thin metallic electrode film. We have investigated the effect of aluminum doping on the improvement of surface morphology of ultra-thin silver films using molecular dynamics simulations. Al-doped silver films showed smaller surface roughness than pure silver films at various substrate temperatures. When the temperature of the substrate was 600 K, the roughness of Al-doped silver film first decreased, and then increased with the increase of the incident velocity of silver atoms. Silver atoms were more likely to agglomerate on the surface of the substrate after adding aluminum atoms, as aluminum dopants promoted the immobilization of silver atoms on SiO2 substrate due to the anchoring effect. The smoother surface could be attributable to the reduced mean free path of silver due to the cage effect by the aluminum dopant.

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Carvalho, Marta C. N. A., Carlos A. Perez, Renata A. Simão, Fabio B. Passos, and Martin Schmal. "The promoting effect of cesium on structure and morphology of silver catalysts." Anais da Academia Brasileira de Ciências 76, no. 1 (March 2004): 19–27. http://dx.doi.org/10.1590/s0001-37652004000100003.

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Silver supported catalysts on alpha-alumina were prepared and characterized by Brunauer-Emmet-Teller equations, scanning electronic microscopy, X-ray diffraction and atomic force microscopy techniques. Results show that these are powerful techniques for the determination of texture, morphology and surface properties. It has been shown that the addition of Cs in the Ag/Al2O3 catalyst increased the dispersion of silver with the formation of small silver particles over a thin silver film already formed over the alumina support. It is important to stress that atomic force microscopy measurements are significant to observe the film and the dispersion of Ag and, on the contrary, X-ray photoelectronic spectroscopy did not, however, it allows to the conclusion that undistinguishable silver, either as metallic or oxidation state, are present at the surface. X-ray diffraction results confirm predominantly metallic silver.

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Dariel, M. P., U. Admon, D. S. Lashmore, M. Ratzker, A. Giuseppetti, and F. C. Eichmiller. "A silver-tin alternative to dental amalgams." Journal of Materials Research 10, no. 3 (March 1995): 505–11. http://dx.doi.org/10.1557/jmr.1995.0505.

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This paper describes a novel technology for a mercury-free metallic direct filling material, a substitute to dental amalgams. The consolidation relies both on cold-welding that takes place under moderate pressure between suitably surface-treated silver particles and on silver-tin intermetallic compound formation at ambient temperature. A dilute acid is used for removing the silver surface oxide layers, thereby promoting the cold-welding process. The condensability, namely the ability of a loose powder to undergo consolidation within a short time duration, at body temperature and under moderate pressure has been investigated for a variety of mixtures of silver, tin, and prealloyed silver-coated intermetallic powders. The resulting metallic composite material displays transverse rupture strength values higher than those of amalgams and somewhat lower values of compressive strength and Knoop hardness.

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Usman, Zeinab H. Mohamed, Shaji Ahmed, and Bruno Jaselskis. "Determination of Micro Amounts of Metallic Silver in Silver Salt Matrices." Analytical Letters 33, no. 12 (January 2000): 2545–51. http://dx.doi.org/10.1080/00032710008543208.

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Fagerquist, Clifton K., Dilip K. Sensharma, Temer S. Ahmadi, and M. A. El-Sayed. "Adhesion of silver iodide molecules to gaseous metallic silver cluster cations." Journal of Physical Chemistry 97, no. 25 (June 1993): 6598–601. http://dx.doi.org/10.1021/j100127a007.

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Moudir, Naïma, Nadji Moulaï-Mostefa, and Yacine Boukennous. "Silver micro- and nano-particles obtained using different glycols as reducing agents and measurement of their conductivity." Chemical Industry and Chemical Engineering Quarterly 22, no. 2 (2016): 227–34. http://dx.doi.org/10.2298/ciceq150106036m.

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Synthesis of silver micro- and nano-particles for the preparation of conductive pastes for the metallization of solar cells was realized by chemical reduction in the presence and absence of poly(vinyl-pyrrolidone) (PVP). Silver nitrate was used as a precursor in the presence of three polyols (ethylene glycol, di-ethylene glycol and propylene glycol) tested at experimental temperatures near their boiling points. Six samples were obtained by this protocol. Three silver powders obtained without the use of PVP have a metallic luster appearance; however, the samples produced using an excess of PVP are in the form of stable colloidal dispersions of silver nano-particles. Structural characterizations of samples using a scanning electron microscope and X-ray diffractometer show a good crystallinity and spherical morphology. From DSC and TGA analyses, it was noticed that all the nano-silvers present in the colloidal suspension have the same thermal behavior.

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Viñals, J., E. Juan, A. Roca, M. Cruells, and J. Casado. "Leaching of metallic silver with aqueous ozone." Hydrometallurgy 76, no. 3-4 (March 2005): 225–32. http://dx.doi.org/10.1016/j.hydromet.2004.11.001.

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Zhang, Yu Heng, Yin An Fang, and Duan Zheng Yao. "Properties of Different Nano-Metallic Particles in Optical Trapping." Materials Science Forum 663-665 (November 2010): 425–28. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.425.

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Metal nanoparticles are well-known to exhibit a strong interaction with light, which have very important applications and one of them, recent years, is optical trapping of the metallic nanoparticles. Based on the principle of the optical trapping for metallic nanoparticles, in this paper, the gradient forces and the scattering forces in the optical trapping for gold-, silver- and copper-nanoparticles have been analyzed and calculated numerically. Typical power spectra for gold-, silver- and copper-nanoparticles have been obtained. It is shown from the calculation results that under what condition these metallic nanoparticles can be trapped, and the stability of the potential well for these metallic nanoparticles has been analyzed in order to know whether the well was deep enough for overcoming the gravity and Brownian motion.

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Liposits, Z., T. Görcs, and K. Trombitás. "Ultrastructural analysis of central serotoninergic neurons immunolabeled by silver-gold-intensified diaminobenzidine chromogen. Completion of immunocytochemistry with X-ray microanalysis." Journal of Histochemistry & Cytochemistry 33, no. 6 (June 1985): 604–10. http://dx.doi.org/10.1177/33.6.3889144.

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Serotonin immunoreactive structures of the rat central nervous system (CNS) were detected by the recently developed silver-intensified peroxidase-antiperoxidase complex (SI-PAP) method at both the light and electron microscopic levels. The silver postintensification of the diaminobenzidine (DAB) chromogen increased the sensitivity of the original PAP method, resulting in a very Golgi-like appearance of serotonin-immunopositive neuronal elements. The metallic silver and gold deposited onto DAB-labeled organelles, filling out the whole immunoreactive neuron, assures the easy tracing of thin neuronal processes far from the cell body. At the ultrastructural level, metallic grains were seen over immunolabeled structures only, proving the specificity of the silver method. In neurons of the dorsal raphe nucleus, free ribosomes, endoplasmic reticulum, and granules (80-100 nm in diameter) were labeled. Immunoreactive, e.g., serotoninergic, dendrites were seen to receive afferent terminals. The increased electron density of the intensified immunolabel facilitates the ultrastructural recognition of even weakly labeled profiles, while its metallic components (Ag and Au) provide a base for X-ray analysis of the immunolabeled biological specimen.

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Fouad, Osama A., Fatma Morsy, Samya El-Sherbiny, and Diaa Abd Elshafy. "Metal Nanoparticles Based Inkjet Ink for Advanced Circuit Board Application." Journal of Nanotechnology in Diagnosis and Treatment 5 (February 27, 2017): 1–10. http://dx.doi.org/10.12974/2311-8792.2017.05.1.

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This study investigates the synthesis of mono metallic (copper and silver) and bi-metallic (copper/silver core/shell) conductive nanopigments for inkjet printing. Polyethylene glycol (PEG) was used as a main reducing agent followed by polyvinylpyrrolidone (PVP) as a capping and dispersing agent. From the XRD, TEM, and SEM analyses, the synthesized mono and bi metallic particles were con?rmed to be in a nano scale with particle size 7, 8.5 and 15.5 nm for copper, silver and copper/silver core/shell, respectively. The prepared nanopigments were included in inkjet ink formulation and printed on flexible polyethylene terephthalate (PET) films. The printed ink films were sintered at various temperatures (110, 150, 200). The results revealed that the resistivity of these particles was reduced by sintering and the resistivity of Cu, Ag and Cu/Ag patterns sintered in air at 200 ºC for 30 min were 3.1, 2.99 and 4.14 µ?-cm, respectively. The obtained results were in a good agreement with the published ones and insured the promising using of our products in metal-based inkjet printed circuit boards (PCB).

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Semenova, Anna A., Vladimir K. Ivanov, Alexander E. Baranchikov, Sergey V. Savilov, and Eugene A. Goodilin. "Hierarchic nanostructuring by self–reduction of silver (I) oxide complexes." Functional Materials Letters 09, no. 01 (February 2016): 1650014. http://dx.doi.org/10.1142/s1793604716500144.

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Silver nanoparticles superficially decorated with hierarchically smaller nanoparticles are obtained for the first time in the course of aging of silver globules in aerated aqueous ammonia. The process is caused at the beginning by gentle etching of metallic silver across extended defects and smoothing of their edges with oxygen dissolved in aqueous ammonia due to silver (I) stabilization within a soluble ammonia complex for a 1–2 day incubation period, then the complex accumulates as an intermediate product and gradually decays into nanosilver because of the ligand loss for the remaining 4–5 days. The as-formed metallic silver deposits onto larger silver particles heterogeneously decorating their surface; this broadens the initial plasmonic peak and causes a weak red shift because of nanostructuring. The latter makes a substantial contribution to the overall optical properties of the nanoparticles of a complex morphology and has to be considered as an important factor affecting optical characteristics of nanoparticle ensembles and their possible plasmonic applications.

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Arjmand, Mohammad, Aref Abbasi Moud, Yan Li, and Uttandaraman Sundararaj. "Outstanding electromagnetic interference shielding of silver nanowires: comparison with carbon nanotubes." RSC Advances 5, no. 70 (2015): 56590–98. http://dx.doi.org/10.1039/c5ra08118a.

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Synthesized silver nanowire/polystyrene nanocomposites showed superior electrical properties to commercial carbon nanotube/polystyrene nanocomposites at high filler loadings. This was ascribed to the higher metallic nature of silver nanowires.

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Vasilescu, Vlad Gabriel, Elisabeta Vasilescu, Augustin Semenescu, Bogdan Florea, Ileana Mariana Mates, and Oana Roxana Chivu. "Contributions Regarding the Influence of the Antibacterial Chemical Deposits on the Surface of the Oral Implant of the Ti10Zr Bio-alloy on Its Behaviour During Use." Revista de Chimie 68, no. 2 (March 15, 2017): 238–42. http://dx.doi.org/10.37358/rc.17.2.5427.

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The antioxidant and disinfectant properties of silver have been known for a long time, but explaining its antibacterial mechanism was only possible through the modern methods of investigation and analysis, such as radioactive isotopes and the electron microscopy. The effective forms of silver that determine the microbial inhibition are the silver salts, and the optimal antimicrobial effect is obtained by releasing continuously a moderate amount of silver ions. On the other hand, many studies show that the size and shape of the silver nanoparticles play a key role in their antibacterial activity. The paper presents some results of the research regarding the chemical deposition of the metallic silver with antibacterial role on the oral implant of the Ti10Zr bio-alloy. The research was conducted in the Chemistry Laboratory of the Sciences and Environment Faculty from the Lower Danube University of Galati. To establish the optimum chemical deposition conditions of the metallic silver we used several experimental regimes in different conditions of experimentation. The paper presents the experimental results obtained when introducing the implants to be covered in the Tollens�s reagent following the influence of the hold time in the solution on the character of the deposition, on the dispersion, on the deposition uniformity and on particle size deposited. To cover chemically with metallic Ag we used solutions prepared with chemically pure reagents and bidistilled water under experimental regimes of chemical deposition. Electron microscopy analyses with electron scanning (SEM) and the EDX elemental analysis revealed the presence of the silver on the surface of implants, the degree of dispersion and the morphology of silver particles deposited according to the experimental regimes.

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Li, Xia, Dong Lin Zhao, and Zeng Min Shen. "Microstructure and Formation Mechanism of Carbon Nanotubes Filled with Metallic Silver Nanowires." Advanced Materials Research 11-12 (February 2006): 587–90. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.587.

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The filling of multi-walled carbon nanotubes with metallic silver nanowires via wet chemistry method was investigated. The carbon nanotubes were filled with long continuous silver nanowires. The carbon nanotubes were almost opened and cut after being treated with concentrated nitric acid. Silver nitrate solution filled carbon nanotubes by capillarity. Carbon nanotubes were filled with silver nanowires after calcinations by hydrogen. The diameters of silver nanowires were in the range of 20-40 nm, and lengths of 100 nm - 10 μm. We studied the micromorphology of the silver nanowires filled in carbon nanotubes by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Based on the experimental results, a formation mechanism of the Ag nanowire-filled carbon nanotubes was proposed.

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Rentería-Tapia, V. M., and J. García-Macedo. "Influence of Oxygen on the Optical Properties of Silver Nanoparticles." Journal of Nanoscience and Nanotechnology 8, no. 12 (December 1, 2008): 6545–50. http://dx.doi.org/10.1166/jnn.2008.18423.

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Silver nanoparticles in sol–gel silica films were obtained by annealing in hydrogen atmosphere and subsequently in oxygen atmosphere. Their properties were measured by UV-vis spectroscopy, transmission electron microscopy (TEM), high-resolution transmission electronic microscopy (HRTEM) and X-ray diffraction analysis. Samples prepared in a reducing atmosphere exhibited a surface plasmon resonance (SPR) located at 399 nm. Silver nanoparticles in an oxidizing atmosphere exhibited a red shift and damping of the SPR. These optical properties were explained due to the oxidation on the surface of silver nanoparticles to silver oxide yield in an oxygen atmosphere. Silver core–silver oxide shell nanostructures were observed by HRTEM. The average size of the metallic nanoparticles obtained by TEM was used for modeling the UV-vis spectra by using the Gans theory. Good fits to the spectra under an oxidizing atmosphere were obtained considering variable refractive indexes coming from the silver oxide shells surrounding to the nanoparticles. Therefore, the interaction between oxygen and the metallic surface of the nanoparticles, sensitively alters their optical properties.

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Ben-Knaz Wakshlak, Racheli, Rami Pedahzur, Barak Menagen, and David Avnir. "An antibacterial copper composite more bioactive than metallic silver." Journal of Materials Chemistry B 4, no. 24 (2016): 4322–29. http://dx.doi.org/10.1039/c6tb00719h.

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Entrapment of chlorhexidine within antibacterial copper leads to the formation of a metal composite, whose bactericidal activity exceeds that of silver and that of its individual components. Since the cost of copper is by far lower than that of silver, high volume applications become more accessible.

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36

Onggar, Toty, Tong Cheng, Hieke Hund, Rolf-Dieter Hund, and Chokri Cherif. "Metallization of inert polyethylene terephthalate textile materials: Wet-chemical silvering with natural and synthetic polyamine, part I." Textile Research Journal 81, no. 19 (September 26, 2011): 2017–32. http://dx.doi.org/10.1177/0040517511413323.

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The wet-chemical functionalization and modification of the inert textile fiber surface of polyethylene terephthalate (PET) was metalized by using natural and synthetic polyamine with new coating procedures. The developed wet-chemical procedures in this research are based on the use of short- and long-chain amines, which consist of at least two amine groups, and which are well-suited to form a silver diamine complex. The silvered PET was coated by cationic silver. After the chemical reduction, the cationic silver turns into metallic particles on the surface of PET. The surface morphology, that is, homogeneity of the layer, cracking, casing, and the fiber surface with metallic silver particles was determined by a scanning electron microscope (SEM). The particle size, as well as the layer thickness, was calculated by the SIS program. The adhesion characterization of the applied silver layers on the PET was tested by a washing fastness check.

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Monje, Anayansi Estrada, and J. Roberto Herrera Reséndiz. "Synthesis of Urethane Base Composite Materials with Metallic Nanoparticles." MRS Proceedings 1547 (2013): 141–47. http://dx.doi.org/10.1557/opl.2013.854.

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ABSTRACTThe antimicrobial properties of polymer materials are used in a verity of applications. Silver nanoparticles are commonly applied to polyurethane foams to obtain antifungal properties. For this study a series of nanocomposites (PU–Ag) from a urethane-type polymer (PU) were reinforced with various amounts of silver nanoparticles having an average size of 20 nm. The surface morphology and antifungal capacity of the nanocomposites were evaluated. As a result, a different surface morphology from PU was found in PU–Ag nanocomposites. The latter nanocomposite showed enhanced thermal and mechanical properties, when compared with the PU without silver nanoaprticles. The nanocomposite also exhibited good antifungal properties that can be used in a variety of applications.

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Tom, Thomas, Eloi Ros, Nicolau López-Pintó, José Miguel Asensi, Jordi Andreu, Joan Bertomeu, Joaquim Puigdollers, and Cristobal Voz. "Influence of Co-Sputtered Ag:Al Ultra-Thin Layers in Transparent V2O5/Ag:Al/AZO Hole-Selective Electrodes for Silicon Solar Cells." Materials 13, no. 21 (October 31, 2020): 4905. http://dx.doi.org/10.3390/ma13214905.

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As optoelectronic devices continue to improve, control over film thickness has become crucial, especially in applications that require ultra-thin films. A variety of undesired effects may arise depending on the specific growth mechanism of each material, for instance a percolation threshold thickness is present in Volmer-Webber growth of materials such as silver. In this paper, we explore the introduction of aluminum in silver films as a mechanism to grow ultrathin metallic films of high transparency and low sheet resistance, suitable for many optoelectronic applications. Furthermore, we implemented such ultra-thin metallic films in Dielectric/Metal/Dielectric (DMD) structures based on Aluminum-doped Zinc Oxide (AZO) as the dielectric with an ultra-thin silver aluminum (Ag:Al) metallic interlayer. The multilayer structures were deposited by magnetron sputtering, which offers an industrial advantage and superior reliability over thermally evaporated DMDs. Finally, we tested the optimized DMD structures as a front contact for n-type silicon solar cells by introducing a hole-selective vanadium pentoxide (V2O5) dielectric layer.

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Pal, Sudipto, and Goutam De. "Reversible transformations of silver oxide and metallic silver nanoparticles inside SiO2 films." Materials Research Bulletin 44, no. 2 (February 2009): 355–59. http://dx.doi.org/10.1016/j.materresbull.2008.05.011.

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Neouze, Marie-Alexandra, and Marco Litschauer. "Entrapment of an Ionic Liquid in a Metallic Silver Matrix through Precipitation." Australian Journal of Chemistry 61, no. 5 (2008): 329. http://dx.doi.org/10.1071/ch08090.

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Entrapment of an ionic liquid within metallic silver by means of physical caging is described. Thermal analysis of this new silver-based composite material allows estimation of the 1-butyl-3-methylimidazolium nitrate entrapment efficiency at 98%.

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Dadvand, Nazila, Mina Dadvand, and Georges Kipouros. "Reversed Pulse Plating of Silver-Cobalt for Connector Applications." International Symposium on Microelectronics 2018, no. 1 (October 1, 2018): 000403–8. http://dx.doi.org/10.4071/2380-4505-2018.1.000403.

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Abstract The manuscript describes the use of anti-galling silver-cobalt alloy as a novel metallic contact finish for connector applications. The purpose of this work was to develop a cost-effective and cyanide-free and self-lubricated silver-cobalt alloy deposited using reversed pulse electrodeposition process for silver-based contact finishes in electrical contacts applications. The manuscript describes a novel silver-cobalt alloy deposited through reversed pulse-electroplating process that provides exceptionally low friction coefficient (similar to hard gold) and outstanding wear resistance compared to standard silver and any commercially available electroplated silver alloys such as silver-tin, silver palladium, silver antimony, silver-bismuth, silver-tellurium, and silver-tungsten.

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Abdelghany, A. M., A. H. Oraby, Awatif A. Hindi, Doaa M. El-Nagar, and Fathia S. Alhakami. "Green synthesis of mixed metallic nanoparticles using room temperature self-assembly." JOURNAL OF ADVANCES IN PHYSICS 13, no. 2 (March 16, 2017): 4671–77. http://dx.doi.org/10.24297/jap.v13i2.5942.

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Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

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GRASEL, F. dos S., B. FLORES, G. MEDEIROS, E. A. LAUSCHNER, A. F. SOUZA, and C. G. BARROS. "STUDY OF THE SUSTAINABILITY IN THE OBTAINMENT OF SILVER NITRATE FROM ANALYTICAL WASTE." Periódico Tchê Química 16, no. 31 (January 20, 2019): 126–32. http://dx.doi.org/10.52571/ptq.v16.n31.2019.132_periodico31_pgs_126_132.pdf.

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Silver is a noble and relatively rare metal found naturally in the earth's crust. This metal is widely used in the manufacture of various products from different segments, among them jewelry, coins, electronics, analytical reagents and the manufacture of sensitive films for photography and radiography. The large generation of waste and the concern about the contamination by inappropriate disposal of dangerous products has been one of the reasons for the study of the reuse of silver and other analytical residues. In this project, we sought to obtain silver nitrate from analytical waste generated in the laboratories. Five different synthetic routes were used to obtain the metallic silver, being the reduction by formaldehyde, glucose, fructose, food grade sugar and metallic zinc. The obtained silver nitrate was analyzed to calculate the yield and degree of purity, where it obtained results superior to 96% of purity, being possible to recycle wastes containing silver, besides reagents expired. The project presented being sustainable and cheap for application in educational institutions, reducing the volume of waste generated and promoting environmental awareness.

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Tateishi, Yuko, Hisahiro Einaga, and Yasutake Teraoka. "Preparation and Characterization of Golden-Colored Pigments Based on Silver Coated with Metal Oxides." Advanced Materials Research 47-50 (June 2008): 1462–65. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.1462.

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The present study aimed at the development of new artificial golden-colored pigments which are thermally stable up to 900 oC and can be used for coloring ceramics wares. Silver was used as a base material with bright metallic luster. Silver with the larger lamellar structure was indispensable to maintain the metallic luster, and it was successfully obtained by the heat-treatment of as-obtained silver powder at 200-400 oC in air and subsequently dry ball-milling at 300 rpm for 1 h. The surface of the lamellar-structured silver was coated with small particles of hydroxides, oxyhydroxides and oxides of Fe, Co, Ni, Ce and Pr. Appearance of golden color depended on the combination of metal species and heat-treatment temperature, and CeO2-coated silver gave golden color after calcination at 800 and 900 oC. The golden color of CeO2-coated silver could be controlled by the loading amount and particle size of CeO2 for color tone and relative area of naked surface of Ag for luster.

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Bhavesh, S., Abirami Arthanari, and S. Rajeshkumar. "Anticariogenic activity of Rose Jasmine formulation mediated silver nanoparticles." Journal of Complementary Medicine Research 13, no. 5 (2023): 137. http://dx.doi.org/10.5455/jcmr.2023.14.01.26.

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Introduction: Rose (rosa canina) is one of the flowers that are much in demand by the community because besides being an ornamental flower it can also be used as a cosmetic base material. Metallic silver (Ag) is a resilient transition element that has been utilised for a long time in jewellery, coinage, and silverware due to its scarcity (ranking 67th in abundance among the elements) and alluring white metallic brilliance. Aim: To study the anticariogenic activity of Rose Jasmine formulation mediated silver nanoparticles. Materials and methods: Muller hinton agar were utilised to identify the zone of inhibition at different concentrations of the prepared extract mediated with silver nanoparticles. Results: It showed that the prepared extract had an average of zone of inhibition at 100ul of the prepared extract. Conclusion: The prepared extract mediated silver nanoparticles had good anticariogenic activity at 100ul concentration.

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Alt, Volker, Christian Heiss, and Markus Rupp. "Treatment of a Recurrent Periprosthetic Joint Infection with an Intramedullary Knee Arthrodesis System with Low-Amount Metallic Silver Coating." Journal of Bone and Joint Infection 4, no. 3 (April 20, 2019): 111–14. http://dx.doi.org/10.7150/jbji.34484.

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Abstract. We present a case of a recurrent periprosthetic knee infection treated with an intramedullary arthrodesis system coated with low amounts of metallic silver. After a follow-up of 26 months, the patient remained infection free and no silver-related complications were detected. Silver serum concentrations remained below the detection limit of 2 ppb.

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Rajput, Chetansing. "Golden Ratio, Silver Ratio and other Metallic Means ; Geometric Substantiation of all Metallic Ratios." JOURNAL OF ADVANCES IN MATHEMATICS 20 (May 23, 2021): 174–87. http://dx.doi.org/10.24297/jam.v20i.9034.

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This paper introduces the concept of special right angled triangles those epitomize the different Metallic Ratios. These right triangles not only have the precise Metallic Means embedded in all their geometric features, but they also provide the most accurate geometric substantiation of all Metallic Means. These special right triangles manifest the corresponding Metallic Ratios more holistically than the regular pentagon, octagon or tridecagon, etc

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Yan, Jia, An Jie Wang, and Dong Pyo Kim. "Preparation of Silver Metallic Sponge from Macroporous Carbon Template." Materials Science Forum 510-511 (March 2006): 770–73. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.770.

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Silver-containing porous frameworks have been extensively used in catalysis, electrochemistry, for heat dissipation and biofiltration. In this study, porous silver sponge was prepared by using a sacrificial macroporous carbon template. Aqueous AgNO3 was infiltrated into the carbon template and reduced to Ag by borohydride reduction reaction, followed by burning of the sacrificial template in air at 500~650°C. The products were characterized by SEM, XRD, and N2 adsorption-desorption isotherms. The Ag sponge exhibited a BET surface area of 12 m2/g.

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Hu, Zhan-Shuo, Fei-Yi Hung, Shoou-Jinn Chang, Wei-Kang Hsieh, and Kuan-Jen Chen. "Align Ag Nanorods via Oxidation Reduction Growth Using RF-Sputtering." Journal of Nanomaterials 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/345086.

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Silver nanorod arrays grew on the individual metallic silver particles after the thermal decomposition of the silver oxides. The formation of silver oxide came from the input of oxygen during sputtering. The subsequent growth of the Ag nanorods started from the single silver grain that originated from the decomposition caused by thermal reduction. This method for oxidation reduction growth used no catalysts and improved the interface effect for the lattice match. Photoluminescence of Ag nanorods was detected at 2.17 eV.

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Ziąbka, Magdalena, Katarzyna Matysiak, Katarzyna Walczak, Marcin Gajek, and Katarzyna Cholewa-Kowalska. "Modification of TiAlV Alloys with Hybrid Layers Containing Metallic Nanoparticles Obtained by the Sol–Gel Method: Surface and Structural Properties." International Journal of Molecular Sciences 23, no. 4 (February 18, 2022): 2283. http://dx.doi.org/10.3390/ijms23042283.

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The aim of the work was to obtain hybrid coatings containing silver, copper, and zinc nanoparticles on the TiAlV medical alloy via a sol–gel process. The developed layers were designed to bring about a bactericidal and fungicidal effect, as well as for protection against surgical scratches during the implantation of implants used in veterinary medicine. In this work, the authors focused on evaluating the microstructure (SEM + EDS); the structure (XRD, FTIR); and the surface properties, such as wettability, free surface energy, and roughness of layers with various concentrations of metallic nanoparticles (2 and 5 mol %). Our results confirmed that the sol–gel method enables the easy manufacturing of hybrid layers endowed with different porosity values as well as various shapes and sizes of metallic nanoparticles. A higher concentration of nanoparticles was observed on the surface containing 5 mol % of metallic salts. The highest degree of homogeneity was obtained for the layers containing silver nanoparticles. In addition, the silver nanoparticles were round and had the smallest dimensions, even below 20 nm. The FTIR and XRD structural studies confirmed the presence of an organosilicon matrix containing all three types of the metallic particles. We conclude that the higher concentration of nanoparticles influenced the alloy surface parameters.

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Journal articles on the topic 'Metallic silver'

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