吸附率

Abstract(#br)The paper describes a reliable technique to prepare PDMS membrane used to determine the permeability to CO 2 and He. SEM controls morphology of surface membrane and SEM/FIB measures the membrane thickness. The data show that permeability becomes thickness dependent below some tens of micrometers. The Islam׳s model, based on the non-equilibrium sorption–desorption process at the interface, fits quite well with the experimental data. The comparison shows that flux models based on interface reaction could apply to describe quantitatively the thickness-dependence of the permeability.

This paper describes a procedure to measure the permeability P , diffusivity D, and rate of adsorption k\u003csub\u003e1\u003c/sub\u003e , thus determining the solubility S and rate of desorption k\u003csub\u003e2\u003c/sub\u003e of He, N\u003csub\u003e2\u003c/sub\u003e, O\u003csub\u003e2\u003c/sub\u003e, CH\u003csub\u003e4\u003c/sub\u003e, and CO\u003csub\u003e2\u003c/sub\u003e on a polydimethylsiloxane (PDMS) membrane. The described procedure is able to determine experimentally all the physical quantities that characterize the gas transport process through a thin rubber polymer membrane.