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Volume 149,number 2 CHEMICAL PHYSICS LETTERS 12August 1988 A MECHANISM FOR THE HYDRATION FORCE DEMONSTRATED IN A MODEL SYSTEM
 

Summary: Volume 149,number 2 CHEMICAL PHYSICS LETTERS 12August 1988
A MECHANISM FOR THE HYDRATION FORCE DEMONSTRATED IN A MODEL SYSTEM
Phil ATTARD
Department of Applied Mathematics, Research School of Physical Sciences, Australian National University,
Canberra, ACT 2601, Australia
and
Murray T. BATCHELOR
tnstiruur-Lorentz voor Theoretische Natuurkunde, Postbus 9506, 2300 RA Lqyden, The Netherlands
Received 2 May 1988; in final form 30 June 1988
The repulsive hydration force measured between polar surfaces originates from the strongly oriented boundary molecules in
hydrogen-bonded liquids. The repulsion is due to the entropy lost (or enthalpy gained) as the surfaces approach, there being fewer
configurations which are able to satisfy the boundary conditions without breaking the bond network of the fluid phase. The
mechanism is illustrated by a six-vertex model for square ice which includes defects. Approximations for the bulk free energy, the
net pressure and an estimate of a surface free energy aregiven.The calculated repulsions are exponentially decaying and of about
the correct magnitude.
1. Introduction
An intriguing phenomenon, the hydration force,
has been subjected to much experimental and the-
oretical research in recent years. These strongly re-
pulsive forces have been measured between lipid

  

Source: Attard, Phil - School of Chemistry, University of Sydney

 

Collections: Chemistry