The X-ray diffraction of CCl4 molecules
adsorbed in slit-shaped graphitic micropores was measured at
303
K. The effect of the pore width in the range of 0.75−1.13 nm on
the structure of CCl4 molecular assembly
in the micropores was examined. The electron radial distribution
function (ERDF) analysis was applied to
the diffraction data, and the ERDFs from only adsorbed molecular
assembly were determined. The peak
position of ERDF due to the first-nearest-neighbor coordination agreed
with that of the bulk liquid, but other
peaks shifted from those of the bulk liquid. The
second-nearest-neighbor peak shifted to a smaller side,
indicating the presence of a more dense short range structure of the
molecular assembly in the micropore.
The peak intensities were noticeably weaker than those of the bulk
liquid, and the tendency became significant
with the decrease of the pore width. These behaviors indicate a
serious restriction for the molecular assembly
structure in the narrow micropore. Although the bulk liquid has a
clear regular coordination structure up to
the fourth-nearest-neighbor range, the structure of molecular assembly
in the micropores smears around the
third or fourth neighbors.
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