Nanotechnology is now very well known as one of the most important key technologies in science and industry. In the field of material science and engineering nanoparticles should be unit materials as well as atoms and molecules to build ceramics devices catalysts and machines and the nanoparticle technology is thus attracting. This novel technology includes various methodologies for nanoparticles: preparation surface-modification via chemical and/or physical treatments immobilization and arrangement on supports or substrates to achieve high performance for luminescence properties in light emitting devices and high efficiency for catalytic and photocatalytic reactions in chemical synthesis chemical decomposition and artificial photosynthesis etc. It should be needless to say that the preparation of nanoparticles having precisely controlled particle size size distribution chemical composition and surface properties is essentially important to realize true nanoparticle technology . This book written by Dr. Dibyendu Ganguli and Dr. Munia Ganguli deals with the preparation methodologies for inorganic nanoparticles using macro- and microemulsions as microreactor . There are several differences between these two emulsions in addition to water droplet size: thermodynamic stability and fusion-redispersion dynamics of the droplets. The properties of the nanoparticles prepared in these emulsion systems are seriously influenced and controlled by the selection of dynamic and static conditions.