JETP Letters

, Volume 108, Issue 2, pp 102–105 | Cite as

On the Diffuse Structure of the Toluene–Water Interface

  • A. M. TikhonovEmail author
Condensed Matter


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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© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  1. 1.Kapitza Institute for Physical ProblemsRussian Academy of SciencesMoscowRussia
  2. 2.Institute of Solid State PhysicsRussian Academy of SciencesChernogolovka, Moscow regionRussia

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