Abstract
This paper analyses the effect of an adsorbed layer of variable curvature during the course of adsorption. To this end the capillary condensation and evaporation verified in pores endowed with elliptical geometry is studied. An adsorption potential within the pore walls is defined and it is numerically derived in accordance with the curvature of the pores and the attraction between the adsorbate and solid molecules. By using the Broekhoff de Boer approach, the condensation and evaporation conditions were calculated in two types of elliptical pores, prolates and oblates. The nitrogen adsorption isotherms, for ink-bottle pores, are presented and discussed. Also, an analysis of the values of the thickness of the condensed layer on the surface of the elliptical pores is carried out. Both the variation of the curvature of the liquid–gas interface and the surface tension result as the most important features that direct the course of the adsorption process.
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Funding was provided by Consejo Nacional de Ciencia y Tecnología (Grant No. 738057).
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Aguilar-Huerta, E., Cordero-Sánchez, S., Rojas-González, F. et al. Effect of the curvature during the course of adsorption in elliptical pores: a study under the framework of the Broekhoff de Boer approximation. Adsorption 26, 553–561 (2020). https://doi.org/10.1007/s10450-020-00235-2
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DOI: https://doi.org/10.1007/s10450-020-00235-2