Densely packed vertically aligned carbon nanotube-polymer composite membrane fabrication and characterization for selective filtration of liquids
Electron Science Research Institute
In this paper, the permeance of membranes based on the use of high-density Vertically-Aligned Carbon Nanotubes (VACNTs) in conjunction with Polydimethylsiloxane (PDMS), as filler material, are investigated for polar and non-polar liquids. Reactive ion etching is used to enhance the hydrodynamic flow properties of the VACNT membranes. Experimental results show that RIE treatment introduces hydroxyl ions (-OH) on the surface of the VACNT membranes, thus enhancing their gatekeeping activity and hydrophilicity simultaneously, and leading to an increase in flow rate for polar and non-polar liquids. The measured permeance improvement factors for water, ethanol, IPA, hexane and gasoline are 100%, 37.2%, 11.8%, 20.9% and 3.8%, respectively, with respect to Oxygen-plasma-treated VACNT membranes.