The effects of surface chemistry of nanofillers on gas separation performance of thin film nanocomposite (TFN) membranes were studied. Ehsan Chehrazi and coworkers developed pristine and three differently surface-modified halloysite nanotubes (HNTs), by non- (SHNT), moderately (ASHNT), or highly CO2-philic (SFHNT) agents. 

Nanomaterials are embedded in the polyamide top layer of thin film nanocomposite (TFN) membranes for CO2/N2 and CO2/CH4 separations. Authors demonstrated that the thickness of the interfacial layer between the filler and polymer matrix is a function of gas pressure applied on the membrane.