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- W2021087526 abstract "The preparation and chemical reactivity of Ag@SiO2 particles have been investigated using UV−vis spectroscopy, laser Doppler electrophoresis, and electron microscopy. The factors governing the deposition of silica onto silane-primed silver particles have been investigated and the deposition conditions (pH and reagent concentrations) optimized. It is demonstrated that the thin silica shells deposited from aqueous/ethanolic sodium silicate solutions are porous. Silver cores dissolve in alkaline cyanide solutions, with the rate depending on the shell thickness. Ag2S@SiO2 can be prepared following exposure to sulfide ion, while silica-coated alloys of silver and gold can be prepared by reaction of Ag@SiO2 with AuCl4-. The kinetics of these core reactions with solution reagents is governed by their rate of diffusion through the shell. A diffusion coefficient of 10-12 cm2 s-1 is estimated for cyanide ion diffusing through non-heat-treated silica shells." @default.
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- W2021087526 date "1998-06-10" @default.
- W2021087526 modified "2023-10-16" @default.
- W2021087526 title "Controlled Method for Silica Coating of Silver Colloids. Influence of Coating on the Rate of Chemical Reactions" @default.
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- W2021087526 doi "https://doi.org/10.1021/la980047m" @default.
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