Abstract
Abstract The dynamics of the process of formation of cholesterol films on a solid substrate prepared by the spontaneous self-assembly technique has been investigated. An expression for the coverage in a multilayer system was derived. Application of the equation to cholesterol multilayer film formation kinetics shows that the approach to equilibrium of the self-assembly process obeys first-order rate law. An observed adsorption free energy change of −21.7 ± 0.1 kJ mol−1 was obtained for cholesterol on quartz slide and a mean lifetime of cholesterol on the slide surface during deposition of 78 ± 3 ks at 298.16 K. A mean lifetime for stearic acid adsorbed from hexadecane onto native aluminium oxide surface (data from elsewhere) was found to be 12.4 ± 0.3 ks. The results suggest dynamic processes which strongly depend on the formation constant of the amphiphile for coordination to the substrate.
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