23606-32-8Relevant academic research and scientific papers
Concave trisoctahedral Ag3PO4 microcrystals with high-index facets and enhanced photocatalytic properties
Jiao, Zhengbo,Zhang, Yan,Yu, Hongchao,Lu, Gongxuan,Ye, Jinhua,Bi, Yingpu
, p. 636 - 638 (2013)
Herein, we demonstrate for the first time the fabrication of concave trisoctahedral Ag3PO4 microcrystals enclosed by {221} and {332} facets based on the heteroepitaxial growth procedure, which exhibit much higher photocatalytic activ
Preparation and microwave shielding property of silver-coated carbonyl iron powder
Cao, Xiao Guo,Ren, Hao,Zhang, Hai Yan
, p. 133 - 137 (2015)
Electroless silver coating of carbonyl iron powder is demonstrated in the present investigation. The carbonyl iron powders are characterized by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction analysis
Small-sized silver nanoparticles for studies of biological effects
Sosenkova,Egorova
, p. 264 - 273 (2011)
The influence of the hydration extent, AOT and silver ion concentration on average particle size and size distribution in micellar solution of silver nanoparticles obtained by biochemical synthesis was investigated. Formation and stability of nanoparticles were controlled by measurements of optical absorption spectra. Particle sizes were determined by transmission electron microscopy. Combinations of varied parameters have been found, making it possible to prepare three micellar solutions of spherical silver nanoparticles with a different average size in the range 4.6-10.5 nm and narrow size distribution (the standard deviation does not exceed 2.5 nm). For the water dispersions prepared from such solutions by the specially developed procedure, possible applications for studies of size effects in the biological action of nanoparticles are also discussed.
Synthesis of Ag nanoparticles on oxide and carbon supports from Ag diammine precursor
Kyriakidou, Eleni A.,Alexeev, Oleg S.,Wong, Andrew P.,Papadimitriou, Christina,Amiridis, Michael D.,Regalbuto, John R.
, p. 749 - 756 (2016/12/09)
To determine whether the method of “strong electrostatic adsorption” (SEA) can be extended to the preparation of uniform and highly dispersed supported Ag catalysts, the adsorption of silver diammine, Ag(NH3)2+, also known as Tollen's reagent, has been examined over five supports (i.e., SiO2, γ-Al2O3, ZrO2, Nb2O5, and carbon) with different surface areas and PZCs. The speciation of Ag in solution was followed by UV–vis spectroscopy, Ag uptake as a function of the solution pH was determined by atomic absorption, and Ag particle size was determined by powder XRD and STEM. At the Ag concentrations, pH, and surface loadings employed, silver diammine complexes convert into soluble Ag(H2O)2+ aquo complexes below pH 11 and hydrolyze to insoluble Ag2O above pH 11. The deposition of either Ag species over carbon at any pH appears to be reactive and results in large particles. The silver aquo complexes appear to adsorb via ion exchange near the PZC of alumina, zirconia, and niobia but not silica, while the silver diammine complexes appear to adsorb electrostatically at high pH over all the oxides tested - niobia, silica, zirconia, and alumina in the order of ascending PZC. Niobia, which has the lowest PZC, adsorbs the highest surface density of Ag via both mechanisms. The particles obtained via electrostatic adsorption of Ag(NH3)2+ at high pH are somewhat smaller than those formed from Ag(H2O)2+ ions at the lower pH values. In the absence of ammonia in solution at high pH, deposition of Ag aquo complexes occurs via surface precipitation and gives large particles. In sum, SEA of silver ammine is demonstrated to be a simple, reproducible way to synthesize small particles on all supports but carbon.
