NAMS 2002 Workshop - ICOM 2008

Because these membranes do not contain a filler, the spaces between the
nanotubes must also be available for transport, but apparently the CNTs are
close enough together that the flux through these spaces has similar behavior to
the flux through nanotubes. The flux of liquid n-hexane through these
membranes was approximately 1,500 kg/m 2 -h at 1 bar pressure drop, which is 3
to 4 orders of magnitude higher than the flux of n-hexane through MFI zeolite
membranes, even though these membranes are thicker (750 mm). The
nanotubes were approximately 3 nm in diameter, as determined by TEM and
calculated from N2 desorption isotherms at 77 K. The average space between
nanotubes is appropriately 3 nm with a distribution from 1.4 to 7 nm, as
calculated by the BJH method from N2 desorption isotherms at 77 K.
1.Hinds, B. J.; Chopra, N.; Rantell, T.; Andrews, R.; Gavalas, V.; Bachas, L. G. Science 2004,
303(5654), 62-65. 2.Holt, J. K.; Park, H. G.; Wang, Y. M.; Stadermann, M.; Artyukhin, A. B.;
Grigoropoulos, C. P.; Noy, A.; Bakajin, O. Science 2006, 312(5776), 1034-1037. 3.Kim, S.;
Jinschek, J. R.; Chen, H.; Sholl, D. S.; Marand, E. Nano Lett 2007, 7(9), 2806-2811. 4.Ci, L. J.;
Manikoth, S. M.; Li, X. S.; Vajtai, R.; Ajayan, P. M. Adv Mater 2007, 19(20), 3300-+. 5.Zhu, L. B.;
Xiu, Y. H.; Hess, D. W.; Wong, C. P. Nano Lett 2005, 5(12), 2641-2645.