Quantachrome Instruments has introduced a new method for the characterization of micro- and mesoporous materials, including catalysts, separation membranes, sensors and other zeolite-based systems. The method is based on Nonlocal Density Functional Theory (NLDFT) and is designed for pore size characterization of zeolitic materials (including MCM-41) with cylindrical pores using high-resolution low-pressure argon adsorption isotherms at 87.3 K. In contrast to the widely used classical macroscopic theories and models, the new method is microscopic in the sense that it describes the sorption and phase behavior of Ar in a narrow pore on a molecular level. This leads to a much more accurate pore size analysis for materials consisting of narrow micro- and mesopores in a diameter range from 0.5 up to ca. 20 nm.
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