Novel synthesis of a porous stainless steel-supported Knudsen membrane with remarkably high permeability

  • Lee D
  • Park S
  • Yu C
 et al. 
  • 5


    Mendeley users who have this article in their library.
  • 20


    Citations of this article.


A stainless steel-supported Knudsen membrane (SKM) with remarkably high permeability was successfully synthesized using only 100 nm-sized colloidal silica sol by means of a dipping-rolling-freezing-fast drying (DRFF) and soaking-rolling-freezing-fast drying (SRFF) method. Hydrogen and nitrogen permeances of the SKM were (6.7-8.2) × 10-6and (1.8-2.3) × 10-6mol m-2s-1Pa-1with a H2/N2permselectivity of 3.5-3.7, which approaches to a theoretical H2/N2selectivity for the Knudsen diffusion mechanism (3.74). In comparison with a typical mesoporous γ-alumina membrane supported on a porous stainless steel or α-alumina substrate, the SKM had 20 and 5.5 times permeance with almost same H2/N2permselectivity, respectively. Generally, mesoporous materials such as γ-alumina and the M41S family with several nm-sized pores are employed to obtain the Knudsen-dominated permeation characteristics. In this case, a decrease in the gas permeance is inevitable due to deposition of a mesoporous skin layer. However, in the case of the SKM, the Knudsen-dominated permselectivity was extraordinarily obtained through modification of porous stainless steel substrates with the colloidal silica particles having relatively large particle size, because a well-densified layer of the 100 nm-sized colloidal silica could be obtained without formation of defects via the freezing procedure. In addition, the large porosity of the 100 nm-sized colloidal silica layer gave rise to the remarkably high gas permeance. © 2007 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Colloidal silica
  • Knudsen membrane
  • Porous stainless steel

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free