Carbon molecular sieve Knudsen diffusion

Gibon J and Soffer A. Knudsen diffusion in microporous carbon membranes with molecular sieving character. J. Membr. Sci. 2002 209 339-352. 

CMS manhranes are composed of microporous carbon (as libers, on tubes or flat sheets) prepared from carbonization of polymeric precursors under controlled conditions. Precursors that are mostly used are cellulose or Pis. Depending on the manbrane pore size and the process conditions, separation may take place according to (1) molecular sieving < 5 A), (2) selective surface flow (5 A < < 12 A), (3) Knudsen diffusion... 

Figure 5.5 Schematic models for (a) parallel transport and (b) resistance in series transport [27], Reprinted from Journal of Membrane Science, 209, j. Gilron and /4. Soffer, Knudsen diffusion in microporous carbon membranes with molecular sieving character, 339-352, Copyright (2002), with permission from Elsevier...

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