This book deals with the synthesis and characterization of a new class of materials - organic nanoparticles. Written by experts in the field, it a details advanced techniques for the chemical synthesis of functional organic nanoparticles and proposes new methods for the characterization and manipulation for single nanoparticles. Theoretical and experimental studies of the physical and chemical properties of organic particles, semiconductor particles and liquid droplets are reported. The text gives not only scientific details but also general and historical background, applications, and future perspectives. Technical terms and concepts are carefully defined and developed. It is intended for researchers, materials scientists, and advanced students.