The sorption properties of carbon nanosystems are investigated using appropriate distribution functions. The adsorption capacities of carbon nanofibers for hydrogen are calculated in the singlet approximation under the assumption that adsorbent molecules elastically interact with walls. The optimum interplanar distances determined for carbon nanofibers are as follows: 0.39 ± 0.07 nm for the reduced density n 0 = 0.15 and 0.46 ± 0.04 nm for the reduced density n 0 = 0.3 .

Molecular systems in contact with the bounding surfaces are examined. New apparatus describing adequately quasi-two-dimensional structures whose cross sectional dimensions are comparable with the correlation length is suggested. It is based on the modified method of the Wigner distribution functions and the system of Ornstein-Zernike equations generalized for one-and two-particle distribution functions. Modeling of the physical gas sorption process in carbon nanofibers and nanotubes allows local microstructure, sorption characteristics, effective sizes, and optimal technological filling parameters to be calculated.

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A self-consistent short-range order description in classical and quantum molecular systems is suggested in which the correlation length is comparable with characteristic dimensions of systems, including liquids in thin films and interphase boundaries. The consideration is based on the method of molecular distribution functions.