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Gor, Gennady Y. [Author]; Huber, Patrick [Author]; Weißmüller, Jörg [Author] ; Technische Universität Hamburg, Technische Universität Hamburg, Technische Universität Hamburg, Technische Universität Hamburg Institut für Werkstoffphysik und Werkstofftechnologie, Technische Universität Hamburg Institut für Werkstoffphysik und Werkstofftechnologie, Technische Universität Hamburg Institut für Werkstoffphysik und Werkstofftechnologie

Elastocapillarity in nanopores: sorption strain from the actions of surface tension and surface stress

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  • Media type: E-Article
  • Title: Elastocapillarity in nanopores: sorption strain from the actions of surface tension and surface stress
  • Contributor: Gor, Gennady Y. [Author]; Huber, Patrick [Author]; Weißmüller, Jörg [Author]
  • Corporation: Technische Universität Hamburg ; Technische Universität Hamburg, Institut für Werkstoffphysik und Werkstofftechnologie
  • Published: 2018
  • Published in: Physical review materials ; Vol. 2. 2018, 8; Article number 086002; insgesamt 17 Seiten
  • Language: English
  • DOI: 10.1103/PhysRevMaterials.2.086002; 10.15480/882.2086
  • Identifier:
  • Origination:
  • Footnote:
  • Description: Adsorption-induced deformation of porous materials is the generation of strains in a solid due to its interaction with adsorbing fluids. The theoretical description of adsorption-induced deformation often relies on the so-called solvation pressure, the normal component of a pressure tensor in the liquid adsorbed in the pore. Recent measurements of adsorption-induced strains in two dimensions require a description that allows for the deformation to be anisotropic. Here, we present such a description. We refrain from using the solvation pressure concept and instead base the discussion on a phenomenological description of coupled mechanics and adsorption that has well-established links to continuum mechanics. We find that our approach captures all relevant features of anisotropic sorption strain; the approach thus provides a useful alternative to the solvation pressure concept. We derive analytical expressions for the stress-strain relations in a model porous material with an array of parallel channel-like pores of high aspect ratio (length/width). These relations include separate terms from the liquid pressure, from the surface stress at the liquid-solid interface, and from a spreading tension at the solid-liquid-vapor triple line. Surface stress and liquid pressure contribute to the strains along and normal to the pore axis in a qualitatively different manner. The underlying discussion of capillary forces sheds light on the variation of the surface stress during adsorption and capillary condensation.
  • Access State: Open Access