Nanotechnology is the study of the controlling of matter on an atomic and molecular scale and is also very diverse, ranging from extensions of conventional device physics to completely new approaches based upon molecular self-assembly. This book gathers and presents data on nanotechnology, including basic introduction on nanoimprint lithography, the technology and materials, and how to use them for achieving an optimum result for research or industrial applications; strategies to obtain well-dispersed, with improved mechanical properties nanocomposites; information about the growing field of nanomaterials formed by green nanotechnology for bioapplication in medical science to minimize the potential human health and environmental risk; the polymer filling process in nanoimprint lithography performed by molecular dynamics simulation; the optical properties and sizes of gold nanoparticles and its practical applications; and the study of the rheological properties of ferrofluid particles and how it compares with some existing models.