Environmentally responsive microgels have been subjects of great interest in the last two decades due to their versatile application. Such microgels are sometimes termed smart since their properties allow them to react in a specific way to external stimuli. Hence, such smart materials can be made responsive to various parameters, such as temperature and, pH and, light, ionic strength, and magnetic fields. Applications of these systems range from various fields like drug delivery, biosensing, and chemical separation, biomaterials and catalysis. The synthesis and application of polymeric and inorganic nanoparticles in miniemulsion enjoy of increasing popularity in academy and industry. In general, formulation of polymer latexes in the environmentally friendly water without the use of organic solvents is of high importance because of security, health and environmental reasons. The process of miniemulsion allows one the formulation of structured nanoparticles which can be used in material science or for biomedical applications. In the last few years, nanoparticles and their applications dramatically diverted science in the direction of brand new philosophy. The properties of many conventional materials changed when formed from nanoparticles. Nanoparticles have a greater surface area per weight than larger particles which causes them to be more reactive and effective than other molecules. Smart Nanoparticles Technology explains complete aspects of nanoparticles with many application examples showing their advantages and advanced development. This book discusses the inherent properties of nanoparticles and their applications in various fields. It includes a number of well researched studies which will help students and experts interested in the field of nanotechnology.