Nanotechnology is the design and engineering of materials that are sized in the dimension of 1 to 100 nanometers. This book on nanotechnology deals with the principles and practices that are followed in nanotechnology. Different approaches, evaluations, methodologies and advanced studies on nanotechnology have been included in this book. The contents presented herein discuss the various approaches and techniques that are followed in nanoengineering and the technological innovations related to it. This book consists of contributions made by international experts. As this field is emerging at a rapid pace, the contents of this book will help the readers understand the modern concepts and applications of the subject.