Nanoporous Materials: Science And EngineeringPorous materials are of scientific and technological importance because of the presence of voids of controllable dimensions at the atomic, molecular, and nanometer scales, enabling them to discriminate and interact with molecules and clusters. Interestingly the big deal about this class of materials is about the nothingness within the pore space. International Union of Pure and Applied Chemistry (IUPAC) classifies porous materials into three