DOI: 10.5176/2251-1857_M318
Authors: Jignasa Solanki and Z. V. P. Murthy
Abstract:
The present work is focused on synthesis of monodisperse and sub nano silver nanoparticles (SNPs). SNPs are extremely valuable in many applications; like catalytic, antimicrobial, heat transfer applications of industrial importance, etc. However, for successful application, synthesis with control over size and size distribution is necessary. This is possible with microemulsion method by optimization of synthesis operating parameters. The experimental study on SNPs synthesis is carried out inside nano-size water pools of water-in-oil (w/o) microemulsion prepared with di-octyl sodium sulphosuccinate (AOT) surfactant. The SNPs are essentially synthesized by chemical reduction of silver nitrate and reducing agent (NaBH4). Though the stirring speed makes important variation in final product size, size distribution and shape; to the knowledge of the authors, till date no work is reported on evaluating its effect on SNPs synthesis. The effect of control parameters; like stirring speed, water-to-surfactant mole ratio is investigated. The optimum water stirring speed is used for further experimental work and optimum water-to-surfactant mole ratio; is obtained. The particle size and distribution are analyzed by dynamic light scattering (DLS), and Ultraviolet-visible (UV-Vis) spectroscopy. The effect of type of reducing agent on the size and size distribution of SNPs is also studied and found to be most effective parameter for controlled size nanoparticles synthesis.
Keywords:
Nanosilver; Nanoparticles; Microemulsion synthesis; DLS. I
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