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On the Diffuse Structure of the Toluene–Water Interface

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Abstract

The electric density profile along the normal to the phase interface between aromatic hydrocarbon toluene and water has been studied by X-ray reflectometry using synchrotron radiation. According to the experimental data, the width of the interface under normal conditions is (3.9 ± 0.1) Å. This value is much larger than a theoretical value of (5.7 ± 0.2) Å predicted by the theory of capillary waves with an interphase tension of (36.0 ± 0.1) mN/m. The observed broadening of the interface is attributed to its own diffuse near-surface structure with a width no less than Å, which is about the value previously discussed for (high-molecular-weight saturated hydrocarbon–water) and (1,2-dichloroethane–water) interfaces.

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Correspondence to A. M. Tikhonov.

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Original Russian Text © A.M. Tikhonov, 2018, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2018, Vol. 108, No. 2, pp. 93–96.

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Tikhonov, A.M. On the Diffuse Structure of the Toluene–Water Interface. Jetp Lett. 108, 102–105 (2018). https://doi.org/10.1134/S0021364018140126

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