Abstract
The cluster structures of supercritical CH 4 confined in slit-shaped carbon micropores was investigated using in situ small-angle X-ray scattering (SAXS) and the cluster analysis for grand canonical Monte Carlo (GCMC) simulation. The pore size distribution of micropores was determined from the fitting of the GCMC-simulated adsorption isotherm to the experimental one for high-pressure CH 4 ; the pore size distributions of two kinds of activated carbon fibers (ACFs) were very narrow, and their average widths are 0.6 and 1.1 nm. The density fluctuation changes with fractional filling from in situ SAXS and GCMC simulation evidenced explicitly the formation of clusters of high concentration in the micropores. CH 4 molecules in smaller pores of 0.6 nm form highly concentrated clusters even in low fractional filling. Fewer clusters are formed in the case of wider pores of 1.1 nm.
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