The scientific and technological issues of nanostructured particles and materials are currently attracting considerable attention. The reason for this is that nanostructured particles and materials, and the physical or chemical combination of substances at the nanometer or subnanometer scale, can lead to innovative materials with improved or even unexpected properties. Applications which could have a great impact can be anticipated in fields like catalysis, technical ceramics, membrane technology, optoelectronics and solid-state ionics with emphasis on systems for clean energy conversion and storage. However, progress in these fields will largely depend on the pace of advance of the fundamental research on nanostructured particles and materials in solid-state chemistry, solid-state physics and materials science. This book presents current research in the study of TiO2 nanoparticles by flame CVD method.