Effect of surface chemistry in contrast-modified SAXS of microporous carbons

Krisztina László, Erik Geissler

Research output: Contribution to journalConference article

Abstract

In contrast variation techniques the interaction between the carbon surface and the fluid phase plays a major role. A relative density function p(q) can be constructed from the ratio of the SAXS response with and without the adsorbed fluid to visualize the pore filling. For n-hexane vapor, the dispersion interaction ensures complete filling of the narrow pores, while larger pores are unpopulated. The value of q at which p(q) vanishes for n-hexane coincides with the critical size of this molecule. For water vapor at 50% relative humidity cluster formation and the degree of filling depend on the extent of oxidation. In the highly oxidized sample, a cooperative mechanism enhances the filling even of larger pores. This is an abstract of a paper presented at the 231th ACS National Meeting (Atlanta, GA 3/26-30/2006).

Original languageEnglish
JournalACS National Meeting Book of Abstracts
Volume231
Publication statusPublished - Jun 28 2006
Event231th ACS National Meeting - Atlanta, GA, United States
Duration: Mar 26 2006Mar 30 2006

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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