Adsorption hysteresis for a slit-like pore model |
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| Authors: | V V Kutarov Yu I Tarasevich E V Aksenenko and Z G Ivanova |
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| Institution: | (1) Scientific-Research Institute of Physics, I. I. Mechnikov Odesa National University, Vul. Pastera, 27, Odesa, 65082, Ukraine;(2) Institut f?r Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universit?t, Duesbergweg 10-14, 55099 Mainz, Germany;(3) A. V. Dumanskii Institute of Colloid Chemistry and Chemistry of Water, National Academy of Sciences of Ukraine, Bul’var Akademika Vernadskogo, 42, Kyiv, 03680, Ukraine |
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| Abstract: | The Frenkel-Halsey-Hill equation is used to describe the adsorption branch of a hysteresis loop upon polylayer adsorption
with an H3 loop according to IUPAC nomenclature. The equation for the desorption branch of a hysteresis loop is derived from
a combined solution to the equation for the Gibbs potential change, given the adsorbent swelling and pore connectivity function,
and the Laplace equation taken for the conditions of infinitely elongated meniscus. This equation is shown to connect the
adsorbate relative pressure in a bulk phase for the desorption branch of a hysteresis loop with the key parameters of the
adsorption system. The equation obtained was verified by a water adsorption isotherm on natural mineral schungite. |
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