MOLECULAR ASSEMBLY STRUCTURE OF CCL4 IN GRAPHITIC NANOSPACES

The X-ray diffraction of CCl4 molecules adsorbed in slit-shaped graphi tic 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 funct ion (ERDF) analysis was applied to the diffraction data, and the ERDFs from only adsorbed molecular assembly were determined. The peak posit ion of ERDF due to the first-nearest-neighbor coordination agreed with that of the bulk liquid, but other peaks shifted from those of the bu lk 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 noticea bly weaker than those of the bulk liquid, and the tendency became sign ificant with the decrease of the pore width. These behaviors indicate a serious restriction for the molecular assembly structure in the narr ow micropore. Although the bulk liquid has a clear regular coordinatio n structure up to the fourth-nearest-neighbor range, the structure of molecular assembly in the micropores smears around the third or fourth neighbors.