Abstract
We evaluate the charge distribution on the surface of
a model cluster of layered silicate and the binding forces
between the model cluster surface and water molecules
with semi-empirical molecular orbital calculation code (MOPAC).
It is found that the negative charge is not localized
on the oxygen atoms of the model cluster surface.
We calculate the binding forces acting on the water molecules
in model cluster-water system and compare them with the binding forces
of solid and liquid phases of water.
We qualitatively discuss the binding force acting on the water xmolecule
directly sorbed on the model cluster surface
and the binding force acting on the water molecule which is not sorbed
on the model cluster surface.