Reversible interconversion of silver cations and silver metal particles in Ag-Y zeolite

1992 ◽  
pp. 339 ◽  
Author(s):  
Toshihide Baba ◽  
Noboru Akinaka ◽  
Mamoru Nomura ◽  
Yoshio Ono
Keyword(s):  
Metal Particles ◽  
Y Zeolite ◽  
Silver Metal ◽  
Silver Cations

Various Applications of Silver Nano-Particles by Ultrasonic Eco-Fabrication

2005 ◽  
Vol 486-487 ◽  
pp. 530-533 ◽  
Author(s):  
Yamato Hayashi ◽  
Hirotsugu Takizawa ◽  
Yoshitaka Saijo ◽  
Tohru Sekino ◽  
Katsuaki Suganuma ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Noble Metal ◽  
Room Temperature ◽  
Silver Oxide ◽  
Nano Particles ◽  
Metal Particles ◽  
Noble Metal Oxides ◽  
Alcohol System ◽  
Silver Metal ◽  
Suitable Process

Applications of silver nano-sized metal particles were investigated for a new, ecologically friendly and economical liquid-solid (silver oxide-alcohol) system. Silver metal oxides as starting materials have merits in metal particles fabrication because these materials are decomposed only by heating in air. That is, noble metal oxide does not use thestrong reduction atmosphere. This reduction is ecologically clean because many noble metal oxides are not toxic, and because O2 is evolved during decomposition. We reduced silver metal oxides by ultrasound and fabricated silver nano metal nanoparticles at room temperature, and various applications were investigated. By choosing a suitable process and conditions, it is reasonable to expect that ultrasonic eco-fabrications can be extended to obtain various silver nano-particles containing materials.

scholarly journals Synthesis of Silver Nanoparticles (NPAg) using Andaliman (Zanthoxylum acanthopodium DC.) Fruit Water Extract and Its Application in Indigosol Blue Photodegradation

2019 ◽  
Vol 22 (5) ◽  
pp. 200-205 ◽  
Author(s):  
Gusti Ayu Dewi Lestari ◽  
Iryanti Eka Suprihatin ◽  
James Sibarani
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Irradiation Time ◽  
Synthesis Method ◽  
Water Extract ◽  
Metal Particles ◽  
Blue Dye ◽  
Particle Size Analyzer ◽  
Optimum Ph ◽  
Silver Metal

Silver nanoparticles (NPAg) are silver metal particles that are less than 100 nm in size. NPAg has several advantages, one of which is as a catalyst in the process of photodegradation. NPAg was obtained by reducing AgNO3 using andaliman fruit water extract (Zanthoxylum acanthopodium DC.). This synthesis method is very effective because it is fast, non-toxic and environmentally friendly technology. This research aims to synthesize optimum NPAg and its application in the photodegradation process of Indigosol Blue in the form of volume, irradiation time, and optimum pH. NPAg synthesis was observed using a UV-VIS spectrophotometer while its size was observed using PSA (Particle Size Analyzer). The results showed the best NPAg synthesized using 1x10-3 M AgNO3 at 60°C with average NPAg size of 9.04 nm. NPAg which is formed is stable for ± 35 days. The optimum condition for the photodegradation process was achieved by using 2 mL NPAg 4 hour irradiation at pH 3. From the results of this study it can be concluded that NPAg can to reduce the concentration of Indigosol Blue dye by up to 94.75%.

Dielectric Properties of Nanocomposites of Silver in a Glass-ceramic Containing the Lithium Niobate Phase

2000 ◽  
Vol 15 (6) ◽  
pp. 1324-1330 ◽  
Author(s):  
A. Dan ◽  
D. Chakravorty
Keyword(s):  
Experimental Data ◽  
Dielectric Constant ◽  
Glass Ceramics ◽  
Metal Particles ◽  
Present Specimen ◽  
Charge Model ◽  
Two Component ◽  
Polarization Mechanism ◽  
Space Charge Model ◽  
Silver Metal

Glass-ceramics containing the LiNbO3 phase were used to grow nanometer-sized silver metal particles with median diameters in the range 10.5–17.3 nm. These nanocomposites showed large values of dielectric constant of the order of 103–104. Bergman's space charge model of a two-component composite gave results that differed from the experimental data. The polarization mechanism was concluded to be electronic in origin. An interrupted metallic strand model developed earlier by Rice and Bernasconi was used to explain the results obtained in the present specimen system.

Orientation Dependence of Photochemical Reduction Reactions on SrTiO3 Surfaces

2002 ◽  
Vol 751 ◽  
Author(s):  
Jennifer L. Giocondi ◽  
Gregory S. Rohrer
Keyword(s):  
Photochemical Activity ◽  
Orientation Dependence ◽  
Reaction Site ◽  
Electron Backscattered Diffraction ◽  
Photochemical Reduction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Individual Grains ◽  
Silver Metal ◽  
Silver Cations

ABSTRACTPolished and annealed surfaces of randomly oriented crystallites were used to study the orientation dependence of the photochemical activity of SrTiO3 surfaces. Silver cations reduced from an aqueous solution produce solid silver metal at the reaction site. The amounts of silver produced by a fixed exposure were used as a relative measure of each grain's activity. The surface structure of the grains was observed using atomic force microscopy and the surface orientation of each grain was determined by electron backscattered diffraction. Surfaces annealed in air for 6h at 1200° C were bound by some combination of the following three planes: {110}, {111}, and a complex facet inclined approximately 24° from {100}. By correlating the orientations of individual grains to the amount of deposited silver, we conclude that surfaces with the complex {100} facet are the most active.

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

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