Abstract
The nature of water films adsorbed on mica surface in humid environment was studied in this paper. Thickness and water insolubility of the films were investigated by surface force apparatus (SFA) and a stable island-like structure was found when the insoluble part of the films meet La3+ ion. Compared with non-SFA type (e.g. scanning tunneling micro-scope and atomic force microscopy) experiments, SFA has unique advantages in measuring the physical properties of the films. Formation conditions, morphology, composition, water-solubility of the structure were discussed with the help of SFA. It is found that the structure demonstrates different patterns in lower pH values. A prediction model of the structure was proposed to explain these results.
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