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Enhanced performance in pervaporation of supercritical carbon dioxide treated poly[1-(trimethylsilyl)-1-propyne] membranes

Claes, Stan; Vandezande, Pieter; Mullens, Steven; Van Bael, Marlies K. and Maurer, Frans LU (2011) In Journal of Membrane Science 382(1-2). p.177-185
Abstract
The effect of a supercritical carbon dioxide (scCO(2)) treatment on the free volume of poly[1-(trimethylsilyl)-1-propyne] (PTMSP) and PTMSP-silica nanohybrid membranes was investigated with positron annihilation lifetime spectroscopy (PALS) and correlated with their performance in pervaporation. Treatment of dense unfilled PTMSP and silica filled PTMSP (2.5, 10 and 20 wt.% silica) membranes with scCO(2) at different pressures and temperatures, resulted in a clear increase in the mean free volume size and an enhanced performance in the pervaporative separation of an aqueous ethanol mixture. Specific permeation rate increases up to 76% were observed for the unfilled membranes treated with scCO(2) at 70 degrees C and 24 MPa. The... (More)
The effect of a supercritical carbon dioxide (scCO(2)) treatment on the free volume of poly[1-(trimethylsilyl)-1-propyne] (PTMSP) and PTMSP-silica nanohybrid membranes was investigated with positron annihilation lifetime spectroscopy (PALS) and correlated with their performance in pervaporation. Treatment of dense unfilled PTMSP and silica filled PTMSP (2.5, 10 and 20 wt.% silica) membranes with scCO(2) at different pressures and temperatures, resulted in a clear increase in the mean free volume size and an enhanced performance in the pervaporative separation of an aqueous ethanol mixture. Specific permeation rate increases up to 76% were observed for the unfilled membranes treated with scCO(2) at 70 degrees C and 24 MPa. The scCO(2)-treatment could thus be seen as an effective alternative to PTMSP-silica (50 wt.%) membranes, which cause a 72% increase in specific permeation rate. Moreover, the ethanol concentration in the permeate increases significantly upon treating the membranes with scCO(2). (C) 2011 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Pervaporation, Supercritical carbon dioxide, Poly[1-(trimethylsilyl)-1-propyne], Free volume, PALS
in
Journal of Membrane Science
volume
382
issue
1-2
pages
177 - 185
publisher
Elsevier
external identifiers
  • wos:000295503800018
  • scopus:80052761301
ISSN
0376-7388
DOI
10.1016/j.memsci.2011.08.009
language
English
LU publication?
yes
id
2fa2dd79-8a38-4eb6-9aef-3032a7478fe4 (old id 2212717)
date added to LUP
2011-11-23 13:47:49
date last changed
2017-01-01 05:45:20
@article{2fa2dd79-8a38-4eb6-9aef-3032a7478fe4,
  abstract     = {The effect of a supercritical carbon dioxide (scCO(2)) treatment on the free volume of poly[1-(trimethylsilyl)-1-propyne] (PTMSP) and PTMSP-silica nanohybrid membranes was investigated with positron annihilation lifetime spectroscopy (PALS) and correlated with their performance in pervaporation. Treatment of dense unfilled PTMSP and silica filled PTMSP (2.5, 10 and 20 wt.% silica) membranes with scCO(2) at different pressures and temperatures, resulted in a clear increase in the mean free volume size and an enhanced performance in the pervaporative separation of an aqueous ethanol mixture. Specific permeation rate increases up to 76% were observed for the unfilled membranes treated with scCO(2) at 70 degrees C and 24 MPa. The scCO(2)-treatment could thus be seen as an effective alternative to PTMSP-silica (50 wt.%) membranes, which cause a 72% increase in specific permeation rate. Moreover, the ethanol concentration in the permeate increases significantly upon treating the membranes with scCO(2). (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Claes, Stan and Vandezande, Pieter and Mullens, Steven and Van Bael, Marlies K. and Maurer, Frans},
  issn         = {0376-7388},
  keyword      = {Pervaporation,Supercritical carbon dioxide,Poly[1-(trimethylsilyl)-1-propyne],Free volume,PALS},
  language     = {eng},
  number       = {1-2},
  pages        = {177--185},
  publisher    = {Elsevier},
  series       = {Journal of Membrane Science},
  title        = {Enhanced performance in pervaporation of supercritical carbon dioxide treated poly[1-(trimethylsilyl)-1-propyne] membranes},
  url          = {http://dx.doi.org/10.1016/j.memsci.2011.08.009},
  volume       = {382},
  year         = {2011},
}