Capillary bridge formation between hexagonally ordered carbon nanorods

Lukas Ludescher, Stephan Braxmeier, Christian Balzer, Gudrun Reichenauer, Florian Putz, Nicola Hüsing, Gennady Y. Gor, Oskar Paris

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)563-578
Number of pages16
JournalAdsorption
Volume26
Issue number4
DOIs
StatePublished - May 1 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Surfaces and Interfaces

Keywords

  • Adsorption isotherm
  • CMK-3
  • Capillary bridges
  • Ordered mesoporous carbon

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