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Dlvo and hydration forces between mica surfaces in Mg2+, Ca2+, Sr2+, and Ba2+ chloride solutions by R.M Pashley; J.N Israelachvili is a Chemistry article available to read on EtoBox.
What is Dlvo and hydration forces between mica surfaces in Mg2+, Ca2+, Sr2+, and Ba2+ chloride solutions about?
The total force between curved sheets of muscovite mica was measured in a range of concentrations of Mg 2÷, Ca 2÷, Sr 1÷, and Ba 2÷ chloride solutions as a function of separation. In each case an increase in concentration caused a reduction in Debye length in close agreement with theory and, in addition, a reduction in double-layer potential consistent with weak adsorption of the divalent cation at the negatively charged mica surface. At concentrations above about 10 -3 Mthe weak double-layer repulsion was completely overcome by van der Waals forces such that the total force was attractive at all distances, corresponding to "coagulation" of the mica surfaces. However, at higher concentrations (91.0 M) the divalent cations become firmly bound to the interacting mica surfaces and then give rise to strong, short-range, repulsive forces which prevent coagulation in a primary minimum. These forces are qualitatively similar to those previously observed for alkali metal ions (Li ÷, Na ÷, K ÷, and Cs ÷ chloride solutions) and appear to be due to the residual hydration shells of the bound cations. The main, qualitative, difference between divalent and monovalent cations is that the former i
Who reads Dlvo and hydration forces between mica surfaces in Mg2+, Ca2+, Sr2+, and Ba2+ chloride solutions?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- R.M Pashley; J.N Israelachvili
- Published
- 1984
- Language
- EN
- Field
- Chemistry (Physical Sciences)