The 2nd volume on applications with discuss the various aspects of state-of-the-art, new challenges and opportunities for gas and vapor separation of polymer membranes, membranes for wastewater treatment, polymer electrolyte membranes and methanol fuel cells, polymer membranes for water desalination, optical, electrochemical and anion/polyanion sensors, polymeric pervaporation membranes, organic-organic separation, biopolymer electrolytes for energy devices, carbon nanoparticles for pervaporation polymeric membranes, and mixed matrix membranes for nanofiltration application.