Capillary bridge formation between hexagonally ordered carbon nanorods

Document Type

Article

Publication Date

5-1-2020

Abstract

Capillary 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.

Identifier

85082855133 (Scopus)

Publication Title

Adsorption

External Full Text Location

https://doi.org/10.1007/s10450-020-00215-6

e-ISSN

15728757

ISSN

09295607

First Page

563

Last Page

578

Issue

4

Volume

26

Grant

1605-N20

Fund Ref

Austrian Science Fund

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