Temperature dependence of CO2 concentration gradient within polymer films as determined by reactive templating

Xinxin Li, Bryan D. Vogt

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The swelling of thin polymer films by supercritical carbon dioxide has been shown to exhibit an anomalous maximum in the sorption isotherms. This swelling maximum occurs when the activity of the fluid phase approaches unity and the extent of the swelling increases as the critical temperature is approached. Using an in situ selective reactive templating approach based upon silica condensation within hydrophilic domains of an amphiphilic polymer film, the CO2 distribution within the polymer film is elucidated from the pore sizes generated by hydrophobic domains upon removal of the amphiphile. The origin of the maximum in the swelling of the thin films is demonstrated to be concentration gradients that extend from both interfaces of the film; as the temperature approaches the critical temperature, the local swelling at both interfaces increases progressively. However, the pressure range over which gradients in CO2 concentration occurs decreases as the critical temperature for CO2 is approached.

Original languageEnglish (US)
Pages (from-to)256-263
Number of pages8
JournalJournal of Supercritical Fluids
Volume51
Issue number2
DOIs
StatePublished - Dec 1 2009

Fingerprint

Polymer films
swelling
Swelling
gradients
temperature dependence
polymers
critical temperature
Temperature
Thin films
Amphiphiles
Carbon Dioxide
Silicon Dioxide
sorption
Pore size
Isotherms
Sorption
carbon dioxide
unity
Condensation
Carbon dioxide

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

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Temperature dependence of CO2 concentration gradient within polymer films as determined by reactive templating. / Li, Xinxin; Vogt, Bryan D.

In: Journal of Supercritical Fluids, Vol. 51, No. 2, 01.12.2009, p. 256-263.

Research output: Contribution to journalArticle

TY - JOUR

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