Capillary bridge formation between hexagonally ordered carbon nanorods

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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