Journal of Nanomedicine & Nanotechnology

Understanding nanocrystalline nickel: A new approach

2^nd International Conference on Nanotek and Expo

December 3-5, 2012 DoubleTree by Hilton Philadelphia Center City, USA

Gunadhor S. Okram

Accepted Abstracts: J Nanomed Nanotechol

Abstract:

Intense research efforts have been focused on nanophase magnetic materials in recent years due to their paramount fundamental interest and technological importance, especially in magnetic recording, ferrofluid technology, magnetocaloric refrigeration, biomedicine and biotechnology. The nanosize devices perform much better than their bulk counterparts owing to their quantum size and surface effects, particularly when the particle size is below the single magnetic domain. Sound understanding of the fundamental aspects necessitates development of new methods for the synthesis of nanophase magnetic materials to tap their potentials more efficiently and economically. For this, they should be characterized well realizing their nearly molecular nature, wherein the materials are constituted by crystals of nanometer dimensions, interfaces and surface atoms. This leads to their local atomic arrangements different from those of the bulk. As the particle size decreases, the number of interface increases, and the fraction of atoms on the interface sites tends to that of crystal lattice atoms. Therefore, they, in addition to the usual atomic interactions in the crystal lattice, determine the overall properties of the material, modify the atomic structure in the interior of crystallites with the introduction of defects, strain fields, or short-range correlated static or dynamic displacements of atom from their ideal lattice position, and hence change the lattice constant or even their crystallographic phase. Some of these interesting aspects shall be addressed in my talk taking into account of our earlier findings also, advanced by our recent ones, choosing nickel as a typical example.

Biography :

Gunadhor S. Okram did PhD from Indian Institute of Technology, Bombay (1989-95); postdoctoral research at Inter University Accelerator Centre, New Delhi (1995-96), at National Institute of Materials Science, Japan (STA Fellow: 1996-1998), and at National Physical Laboratory, New Delhi (CSIR, SRA: 1999-2001). Presently working as a scientist at UGC-DAE Consortium for Scientific Research, Indore, India, since 2001, he has delivered several seminars at various international audiences and has over 60 peer-reviewed international journal publications in his credit with the same number of papers presented at diverse national and international conferences.