JFET_V6_N3_A3 K. Vijay Kumar M. Ashok J.V. Satish Kumar Reddy Journal on Future Engineering and Technology 2230 – 7184 6 3 18 24 Nano Clusters, Nano Fabrications, top-down Approach, Bottom-up Approach, Self-Assembly, and Nucleation Theory The fundamental mechanics relations governing the geometry of nanoclusters are reviewed and illustrations are presented. The Nanofabrication processes namely, 'top-down i.e., it all begins from a bulk piece of material, which is then gradually or step-by-step removed to form objects in the nanometer-size regime and 'bottom-up' i.e., it all begins from atoms and molecules that get rearranged and assembled to larger nanostructures. It is the new paradigm for synthesis in the nanotechnology world as the 'bottom-up' approach allows a creation of different types of nano clusters. The Forces and Interactions of Self-Assembly and their relevant bonds affecting the bottom up fabrication have been discussed. Finally classical nucleation theory for clusters formation has been reported. February - April 2011 Copyright © 2011 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1409