Capillary rise of water in hydrophilic nanopores

Simon Gruener, Tommy Hofmann, Dirk Wallacher, Andriy V. Kityk, and Patrick Huber
Phys. Rev. E 79, 067301 – Published 22 June 2009

Abstract

We report on the capillary rise of water in three-dimensional networks of hydrophilic silica pores with 3.5 nm and 5 nm mean radii, respectively (porous Vycor monoliths). We find classical square root of time Lucas-Washburn laws for the imbibition dynamics over the entire capillary rise times of up to 16 h investigated. Provided we assume two preadsorbed strongly bound layers of water molecules resting at the silica walls, which corresponds to a negative velocity slip length of 0.5nm for water flow in silica nanopores, we can describe the filling process by a retained fluidity and capillarity of water in the pore center. This anticipated partitioning in two dynamic components reflects the structural-thermodynamic partitioning in strongly silica bound water layers and capillary condensed water in the pore center which is documented by sorption isotherm measurements.

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  • Received 25 November 2008

DOI:https://doi.org/10.1103/PhysRevE.79.067301

©2009 American Physical Society

Authors & Affiliations

Simon Gruener1,*, Tommy Hofmann1, Dirk Wallacher2, Andriy V. Kityk3, and Patrick Huber1,†

  • 1Faculty of Physics and Mechatronics Engineering, Saarland University, D-66041 Saarbrücken, Germany
  • 2Helmholtz Center for Materials and Energy, Glienicker Str. 100, D-14109 Berlin, Germany
  • 3Institute for Computer Science, Czestochowa University of Technology, Aleja Armii Krajowej 17, PL-42220 Czestochowa, Poland

  • *s.gruener@mx.uni-saarland.de
  • p.huber@physik.uni-saarland.de

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Issue

Vol. 79, Iss. 6 — June 2009

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