A long time ago, about 20-25 years ago, when we used to work on materials with small particles even in the range 4-5 nm, particularly in a magnetic or electronic material, we were not aware that we were actually dealing with nano materials. These materials showed very interesting magnetic or electronic properties, which are the main properties of great concern in the field of modern nano materials or nano composites. Recently, during the last ten years or so, there has been a surge of scientific activities on the nano materials, or even on commercial products in the marketplace, that are called nano products. Any material containing particles with size ranging from 1 to 100 nm is called nano material, and in this particle size range, these materials show peculiar properties, which cannot be adequately explained with our present-day knowledge. In comparison, the voltage on the research activities and the consequent enthusiasm are on the rise by the day. In the world of materials, like ceramics, glasses, polymers and metals, there has been a considerable activity in finding and devising newer materials. All these new materials in question have extraordinary properties for the specific applications, and most of these materials have been fabricated by newer techniques of preparation. Moreover, they have been mostly characterized by some novel techniques in order to have an edge on the interpretation of the experimental data to be able to elucidate the observed interesting properties.
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