Showing papers by "Nikhil R. Jana published in 1997"
TL;DR: In this paper, it was shown that borohydride adsorbs on the surface of the silver particle and decreases the reduction potential of the particle so that it reacts rapidly with oxygen.
Abstract: Nanosize silver particles are formed in aqueous surfactant systems and have been found to be very reactive toward oxygen in the presence of borohydride. Purging of air (O2) or simple shaking leads to complete dissolution of silver particles, which is further regenerated on standing. Thus an oscillation between a yellow silver plasmon band and colorless solution is observed on periodic shaking. This oscillation continues as long as excess borohydride is present. Investigation shows that borohydride, which is a strong nucleophile, adsorbs on the surface of the silver particle and decreases the reduction potential of the silver particle so that it reacts rapidly with oxygen. Surfactant plays an extra role over particle stabilization. It removes the oxidized silver from the particle surface to the bulk and also retards the rate of reduction of AgI to Ag0.
261 citations
TL;DR: Gold can be dissolved at room temperature (25 °C) in aqueous I 2 I − or I 2 SCN − system and these systems have also been used to dissolve silver and copper without the need of any acid or severe chemical condition whatsoever as mentioned in this paper.
37 citations
TL;DR: In this article, the surface quenching effect has been shown to be surface induced which has been authenticated by the reversible formation and destruction of the particle surface, and the quench effect was described.
17 citations
TL;DR: Gold can be dissolved at room temperature (25 °C) in aqueous I 2 I − or I 2 SCN − system and these systems have also been used to dissolve silver and copper without the need of any acid or severe chemical condition whatsoever.
Abstract: Gold can be dissolved at room temperature (25 °C) in aqueous I 2 I − or I 2 SCN − system and these systems have also been used to dissolve silver and copper without the need of any acid or severe chemical condition whatsoever.
2 citations
Journal Article•
2 citations