Kinetic evolution studies of silver nanoparticles in a bio-based green synthesis process

Prathna, TC and Chandrasekaran, N and Raichur, Ashok M and Mukherjee, Amitava (2011) Kinetic evolution studies of silver nanoparticles in a bio-based green synthesis process. In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 377 (1-3). pp. 212-216.

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Abstract

Silver nanoparticles are being extensively studied due to their widespread applications and unique properties. In the present study, the growth kinetics of silver nanoparticles as synthesized on reduction of silver nitrate solution by aqueous extract of Azadirachta indica leaves was investigated. The formation of silver nanoparticles was preliminarily monitored by measuring the absorption maxima at different time intervals after adding the reducing agent to the silver salt solution (0.5, 1, 1.5, 2, 2.5, 3, 3.5 and 4 h). At different time points characterization studies were conducted using X-ray diffraction studies, FT-IR techniques, zeta potential studies and transmission electron microscopy. The total available silver in the reaction medium was determined at different durations using ICP-OES. The changes in reduction potential in the medium were also monitored using potentiometric analysis. The results confirm a definite change in the medium pertaining to formation of the stable nanoparticles after 2 h, and a significant increase in the agglomeration tendency after 4 h of interaction. The growth kinetic data of the nanoparticles till 3.5 h was found to fit the LSW model confirming diffusion limited growth. (C) 2011 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Publisher:	Elsevier Science B.V
Additional Information:	Copyright of this article belongs to Elsevier Science B.V.
Keywords:	Silver nanoparticles;Bio-based;Growth kinetics;LSW model
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	12 Apr 2011 07:23
Last Modified:	12 Apr 2011 07:23
URI:	http://eprints.iisc.ac.in/id/eprint/36759

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