Effect of Subphase Ca++ Ions on the Viscoelastic Properties of Langmuir Monolayers
摘要：
It is known that the presence of cations likeCa++orPb++in the water subphase alters the pressure-area isotherms for fatty acid monolayers. The corresponding lattice constant changes have been studied using x-ray diffraction. Reflection-absorption spectroscopy has been used to probe the chemical composition of the film. We report on the first measurements of the time evolution of the shear viscosity of arachidic acid monolayers in the presence ofCa++ions in the subphase. We find that the introduction ofCa++ions to the water subphase results in an increase of the film's viscosity by at least three orders of magnitude. This increase occurs in three distinct stages. First, there is a rapid change in the viscosity of up to one order of magnitude. This is followed by two periods, with very different time constants, of a relatively slow increase in the viscosity over the next 10 or more hours. The corresponding time constants for this rise decrease as either the subphasepHorCa++concentration is increased.
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DOI：
10.1063/1.479648
被引量：
年份：
1999
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