On the Multi-Layered Adsorption of Alcanols in the Vicinity of Liquid–Vapor Transition at the Saturated Hydrocarbon–Water Interface

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Structure of adsorption layer of long-chain monoatomic alcohols: 1-dodecanol and 1-tetracosanol at the interfaces n-hexane – water and n-hexadecane – water in the vicinity of “liquid – vapor” thermotropic phase transition is investigated by the method of X-ray reflectometry at synchrotron source. Model-independent structural data obtained on the adsorption layers under investigation deviate considerably from the structural parameters which have been proposed previously within a model-based representation and discussed in previous publications on said systems. It is shown that in the low-temperature mesophase the adsorption film consists of a Gibbs monolayer, a transitional liquid region with thickness of two to three monolayers ~50 Å and an extended (wide up to 200 Å) layer of micelles. Presence of a plane of the closest approach of micellar layer to the adsorption film at the interface is established. Transition to the high-temperature mesophase is followed by liquefying and partial evaporation of alcanol film along with observed depletion of micellar layer down to its complete disappearance.

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作者简介

A. Tikhonov

P.L. Kapitza Institute for Physical Problems, RAS

编辑信件的主要联系方式.
Email: tikhonov@kapitza.ras.ru
俄罗斯联邦, Moscow

Yu. Volkov

Kurchatov Institute

Email: volkov.y@crys.ras.ru
俄罗斯联邦, Moscow

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2. Fig. 1. Angular dependences of the reflection coefficient R from dodecanol at the n-hexane-water interface, normalised to the Fresnel function RF, in the low-temperature (T = 8.0°C, circles; T = 20.0°C, squares) and high-temperature (T = 55.1°C, triangles) phases. The lines indicate the calculated reflection curves

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3. Fig. 2. Angular dependences of the reflection coefficient R from tetracosanol at the n-hexadecane-water interface, normalised to the Fresnel function RF, in the low-temperature (T = 50.8°C, circles), transition (T = 53.0°C, squares) and high-temperature (T = 81.9°C, triangles) phases. Lines indicate calculated reflection curves

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4. Fig. 3. Reconstructed electron concentration profiles ρ(z) for the n-hexane-water interface, normalised to the electron concentration in water at normal conditions ρw = 0.333 e/Å3, in the low-temperature (T = 8.0°C, solid line; T = 20.0°C, dashed line) and high-temperature (T = 55.1°C, dashed line) phases

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5. Fig. 4. Reconstructed electron concentration profiles ρ(z) for the n-hexadecane-water interface, normalised to the electron concentration in water at normal conditions ρw = 0.333 e/Å3, in the low-temperature (T = 50.8°C, solid line), transition (T = 53.0°C, dashed line) and high-temperature (T = 81.9°C, dotted line) phases

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