Nanoporous membranes comprising single walled, double walled, and multiwalled carbon nanotubes embedded in a matrix material were fabricated for fluid mechanics and mass transfer studies on the nanometer scale and commercial applications. Average pore size can be 2 nm to 20 nm, or seven nm or less, or...http://www.google.co.uk/patents/US8038887?utm_source=gb-gplus-sharePatent US8038887 - Membranes for nanometer-scale mass fast transport
