This is the final volume of the four volume set of Comprehensive Guide for Mesoporous Materials. Mesoporous materials are found abundant in biological systems and minerals and some of these materials have long been used in various industries. Recent advances in scientific understanding and manipulating in nanoscale caused an increase in the usage of these materials. One of the most important applications of mesoporous membranes are due to the special ability of pores. For example, controls of specific DNA structures and molecules filtration are possible. This volume mainly discusses the application and commercialization of mesoporous materials.