Confined state of alcohol in carbon micropores as revealed by in situ X-ray diffraction

T. Ohkubo, T. Iiyama, T. Suzuki, K. Kaneko

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The X-ray diffraction (XRD) of ethanol and methanol molecules confined in carbon micropores was measured at 303 K. The effect of the pore width in the range of 0.7-1.1 nm on the molecular assembly structure of ethanol and methanol in the micropores was examined. The XRD patterns were analyzed by use of the electron radial distribution function (ERDF) analysis. The density of alcohol molecular assemblies in micropores was determined by using ethanol or methanol adsorption at 303 K and nitrogen adsorption at 77 K. The density of alcohol molecular assemblies in pores of 1.1 nm was close to the solid density of alcohol, whereas that in micropores of 0.7 nm was almost equal to the bulk liquid density. However the amplitudes of the ERDFs of alcohol in both micropores were much greater than that of bulk liquid, indicating that the serious confinement in micropores gives rise to their solid-like ordering even at 303 K.

Original languageEnglish
Pages (from-to)411-419
Number of pages9
JournalStudies in Surface Science and Catalysis
Publication statusPublished - Jan 1 2000
Externally publishedYes


ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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