Permeation mechanism for a thermo-sensitive composite membrane composed of porous glass and n-isoprof1yilacf1ylamide

Tomoya Tsuji, Mikio Konno, Shozaburo Sato

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


A previously proposed method for preparing a composite membrane of hydrogels and porous inorganic substances was used for the synthesis of a thermo-sensitive membrane with switching ability. The membrane was made of porous glass and N-isopropylacrylamide gel, which has a volume-phase transition of the thermo-shrinking type. Permeation experiments demonstrated that the composite membrane functioned as an ultrafiltration membrane, the cut-off molecular weight and solution permeation rate of which dramatically changed on volume-phase transition. To make clear the permeation mechanism of the membrane, additional experiments were carried out in which the diffusion rates of 3H-labeled water through the membrane were measured at various temperatures. From the experimental results the pore radii in the gel could be estimated. It is shown that the rejection characteristics of the membrane are predictable from the pore radii estimated.

Original languageEnglish
Pages (from-to)447-452
Number of pages6
Issue number4
Publication statusPublished - 1990


  • Composite Membrane
  • Hydrogel
  • Membrane Separation
  • Switching Ability
  • Ultrafiltra-
  • Volume-Phase Transition
  • tion

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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