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Colloid and Polymer Science

, Volume 278, Issue 5, pp 475–480 | Cite as

Changes in density and surface tension of water in silica pores

  • T. Takei
  • K. Mukasa
  • M. Kofuji
  • M. Fuji
  • T. Watanabe
  • M. Chikazawa
  • T. Kanazawa
SHORT COMMUNICATION

Abstract

 The density and surface tension of water in small pores of silicas have been investigated. These physical properties of water in the pores were calculated from a comparison of pore volumes and pore radii which were estimated from adsorption and desorption isotherms of nitrogen and water. Below a pore radius of about 5 nm both the density and the surface tension of water in the pores were smaller than those of the bulk liquid and decreased with a decrease in pore size. The density of water in the pores decreased with an increase in the concentration of surface hydroxyl groups. Similarly the surface tension of water in the pores is influenced by the surface hydroxyl groups. Anomalous changes in the density and surface tension of the water in the pores are attributed to the interaction of water molecules with surface hydroxyl groups and hydrogen-bond formation among water molecules.

Key words Adsorption Silica Pore Water The Kelvin equation 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • T. Takei
    • 1
  • K. Mukasa
    • 1
  • M. Kofuji
    • 1
  • M. Fuji
    • 1
  • T. Watanabe
    • 1
  • M. Chikazawa
    • 1
  • T. Kanazawa
    • 1
  1. 1.Division of Applied Chemistry Graduate School of Engineering Tokyo Metropolitan University 1-1, Minami-ohsawa, Hachioji Tokyo 192-0397, Japan e-mail: takei-takashi@c.metro-u.ac.jp Tel.: +81-426-772850 Fax: +81-426-772821JP

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