Capillary bridge formation between hexagonally ordered carbon nanorods
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Published:2020-03-21
Issue:4
Volume:26
Page:563-578
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ISSN:0929-5607
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Container-title:Adsorption
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language:en
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Short-container-title:Adsorption
Author:
Ludescher LukasORCID, Braxmeier Stephan, Balzer Christian, Reichenauer Gudrun, Putz Florian, Hüsing Nicola, Gor Gennady Y.ORCID, Paris Oskar
Abstract
AbstractCapillary condensation within the pore space formed by a hexagonal arrangement of carbon nanorods is investigated using a thermodynamic model. Numerical solution of the corresponding non-linear differential equations predicts two characteristic equilibrium phase transitions corresponding to liquid-bridge formation between adjacent rods, and the subsequent filling of the entire pore space with liquid adsorbate at higher relative pressure, respectively. These separate transitions are predicted for a wide range of porosities, as demonstrated for two non-polar fluids, nitrogen and n-pentane, employing experimentally determined reference isotherms to model the fluid–solid interactions. The theoretical predictions are compared to experimental data for nitrogen and n-pentane adsorption in an ordered mesoporous CMK-3 type material, with the necessary structural parameters obtained from small-angle X-ray scattering. Although the experimental adsorption isotherms do not unambiguously show two separate transitions due to a high degree of structural disorder of the mesopore space, their general trends are consistent with the theoretical predictions for both adsorbates.
Funder
Marshallplan-Jubiläumsstiftung Austrian Science Foundation FWF German Science Foundation DFG
Publisher
Springer Science and Business Media LLC
Subject
Surfaces and Interfaces,General Chemical Engineering,General Chemistry
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