Abstract
The in situ small-angle X-ray scattering (SAXS) of water and CCl4 adsorbed on pitch-based activated carbon fibers (ACF) were measured at 303 K. We extended the Debye-Bueche theory to the 3-phase mixed system (solid phase: carbon, adsorbed phase, and vacant space) to obtain the average dimension of each phase (ls, la, and lv). The la of water in wider pore system (pore width: ω=1.13nm) increases with the fractional filling φ. On the other hand, la in smaller pore system (ω=0.75nm) does not change with φ. These results show the difference in the cluster growing process with the pore width. It seems that the difference in the size and shape of water clusters in the adsorption and desorption processes should lead to the adsorption hysteresis. The developed analysis method may give the direct information on molecular assemblies in micropores.
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