This book provides an overall view of the basic nature, material properties, production methods, and applications of superfine particles. It is intended to be a reference book for postgraduate students, professional engineers, and researchers in the area of materials science, and an instructional book for undergraduate students. From the fundamentals of superfine particles, through to the details of current applications in electronic, magnetic, optical, catalyst and sensor materials, it presents a timely and complete explanation of superfine particle technology.