EFFECT OF CHAIN LENGTH OF OXYETHYLENE GROUP ON PARTICLE SIZE AND ABSORPTION SPECTRA OF SILVER NANOPARTICLES PREPARED IN NON-IONIC WATER-IN-OIL MICRO EMULSIONS |
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| Authors: | Rahul P Bagwe Bijaya K Mishra Kartic C Khilar |
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| Institution: | 1. Department of Chemical Engineering , Indian Institute of Technology , Bombay, Mumbai, 400 076, India;2. ICI, India, Research and Technology Centre , Thane Belapur Road, Thane, India |
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| Abstract: | The formation of silver nanoparticles by the method of reduction of silver ions by sodium borohydride in non-ionic water-in-oil microemulsion was investigated as a function of structure of the surfactant. Three types of non-ionic surfactants were selected differing in the chain length of the oxyethylene groups for example: NP-5, NP-9 and NP-11. The silver nanoparticles were characterized by UV-Visible Absorption Spectroscopy and Transmission Electron Microscopy. TEM. The results of this study showed that the panicle size is relatively smaller incase of NP-9 while for NP-5 and NP-11 the sizes are comparable. This obsevation is explained on the basis of structure of the droplets and the influence of Intermicellar exchange on nucleation and growth of particles. |
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