Nitrogen transport at 77K through the cylindrical pores in 0.01μm track-etched membranes occurs by a combination of Knudsen diffusion and capillary flow. This transport can be quantitatively predicted without adjustable parameters from a modified form of the theory of Abeles et al. (1991). This implies that some anomalies previously observed for transport with capillary condensation are geometrical artifacts of the heterogeneous pores which were used.
Bibliographical noteFunding Information:
This work was partially supported by the National Science Foundation (CTS 96-27361) and by the Department of Defense (DAA H04-95-1-0094).
- Capillary condensation
- Microporous membranes