Debabrata Singha , Nabajeet Barman and Kalyanasis Sahu *

1. A simple size controllable synthesis of superior optical quality silver nanoparticle in reverse micelles by ascorbic acid reduction DebabrataSingha, Nabajeet Barman and KalyanasisSahu* Department of Chemistry, Indian Institute of Technology Guwahati Abstract (a) Our method where ordinary AOT used (b) Ag-AOT used [2]. Here we have presented our recent effort [1] for making an exceptionally easy, yet extremely efficient catalytic method to fabricate high optical quality silver nanoparticles (AgNPs) via microemulsion route using ascorbic acid as a reducing agent. For the first time, we have shown that reverse micelle (RM) can support a chemical reduction that cannot proceed in aqueous medium at room temperature. • Characterization of nanoparticles Transmission electron microscopy (TEM) Dynamic light scattering (DLS) Uv-visible measurement References Conclusion [1] D. Singha, N. Barman and K. Sahu, Journal of Colloid and Interface Science, 2014, 413, 37-42. [2] C. Petit, P. Lixon and M. P. Pileni, J. Phys. Chem., 1993, 97, 12974-12983. [3] J. N. Solanki and Z. V. P. Murthy, Ind. Eng. Chem. Res.,2011, 50, 12311. The spectral width of the SPR band was found to be much narrower than most of the reported methods via the microemulsion route . The high optical quality was successfully rationalized based on the mild character of the reducing agent and the catalytic action of the nascent AgNCs supported inside the interfacial region of the reverse micelles . A good optical quality is particularly desirable, for studying interaction with other absorbing species (e.g. plasmon-fluorophore interaction) Acknowledgements: This work has been supported by the Indian Institute of Technology Guwahati.