Permporometry characterization of microporous ceramic membranes

Citation
T. Tsuru et al., Permporometry characterization of microporous ceramic membranes, J MEMBR SCI, 186(2), 2001, pp. 257-265
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry,"Chemical Engineering
Journal title
JOURNAL OF MEMBRANE SCIENCE
ISSN journal
0376-7388 → ACNP
Volume
186
Issue
2
Year of publication
2001
Pages
257 - 265
Database
ISI
SICI code
0376-7388(20010530)186:2<257:PCOMCM>2.0.ZU;2-F
Abstract
An evaluation of nano-order pore size of membranes was carried out using pe rmporometry, the basic principle of which is based on capillary condensatio n of vapor and the blocking effect of permeation of a non-condensable gas. A computer-controlled apparatus was constructed, where liquid was injected by a syringe pump and nitrogen was used as a carrier, and was applied to th e evaluation of the pore size of ceramic membranes prepared from a silica-z irconia composite. The pore size distribution, based on the Kelvin equation (Kelvin diameter), was evaluated over a range of 0.5-30 nm, using water as a condensable vapor. Vapors used in the present study were water, methanol , ethanol, isopropanol, carbon tetrachloride, and hexane. For the case of r elatively large pore sizes (larger than 1 nm, based on water vapor), pore s ize distribution obtained by water vapor agreed very well with those by car bon tetrachloride and hexane. However, pore sizes measured using alcohols w ere found to be smaller than those determined by water vapor. For the case of pore sizes smaller than 1 nm, the adsorption layer before capillary cond ensation appears to play an important role. (C) 2001 Elsevier Science B.V. All rights reserved.