A simple route for manufacturing highly dispersed silver nanoparticles

Abstract

Highly dispersed uniform silver nanoparticles were prepared by reducing silver diamine ions [Ag(NH3)2]+ with D-glucose in the presence of a stabilizing agent. Along with the nature of the dispersing agent, the pH and the temperature of the reaction had the most pronounced effect on the reduction rate, the nucleation of the metallic phase, and ultimately the size and dispersion of the resulting particles. Through suitable manipulations of these parameters, it was possible to prepare uniform Ag nanoparticles ranging in size from 30 to 120 nm. A rapid and complete reduction of the silver species was possible only at elevated pH and temperatures above 50 °C. The reduction of silver diamine ions in these conditions caused the complete cleavage of the C–C bond, resulting in the release of 12 electrons per molecule of D-glucose. It was also found that the addition of ammonia to an already acidified silver nitrate solution leads to the formation of a much more stable and safe-to-handle diamine complex.

Metallic silver nanoparticle: a therapeutic agent in combination with antifungal drug against human fungal pathogen

“…At alkaline condition, large numbers of nanoparticles with smaller diameters were formed since large numbers of functional groups were available for silver binding. This result confirmed the important role played by pH in controlling the shape and size of Ag nanoparticle synthesis, as reported in [42] with similar pH effect.…”

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“…The investigation reveals that the pH played an important role in controlling the size of the silver nanoparticles. A similar pH effect was reported at elevated pH in addition to the complete and rapid reduction of the silver nanoparticles 39 .…”

Phytosynthesis of Silver and Gold Nanoparticles Using the Hot Water Extract of Mixed Woodchip Powder and Their Antibacterial Efficacy

“…Earlier reports indicated that the pH of a reaction mixture greatly influenced the biosynthesis of NPs as well as their stability. According to Andreescu et al [25], an increase in the pH resulted in an increase in the absolute value of the negative zeta potential, which led to the formation of highly stable NPs. This phenomenon could be attributed to electrostatic repulsions at high pH or the high absolute value of the negative zeta potential [26].…”