Fast Mass Transport Through Carbon Nanotube Membranes

The May 19, 2006 issue of Science included a paper by Holt et al.1 on “Fast Mass Transport Through Sub-2-Nanometer Carbon Nanotubes”. The paper was also featured on the cover, showing methane molecules translating inside a carbon nanotube (CNT). The authors explained how they prepared 2–6-μm thin membranes consisting of double-walled carbon nanotubes (DWNTs) all aligned perpendicular to the apparent membrane surface. These tubes are open at both...