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On the Problem of the Relationship between the Contact Angle and Surface Roughness Coefficient: Quartz Wettability with Melted Germanium

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Abstract

Equilibrium contact angles of melted geranium have been measured at fused quartz surfaces. The surfaces were preliminarily grinded, polished, and, in some cases, etched. Then, the roughness coefficients are determined for the relief profile and the surface itself by optical interferometry using a NanoMap 1000 WLI profilometer. The contact angle has been found to vary in a range of 147°–164° depending on the method of surface pretreatment. The measured values of the contact angles agree with the data of other researchers. At the same time, the analysis of the obtained data has led to the conclusion that Wenzel’s equation, which relates the contact angles at smooth and rough surfaces, is not valid for germanium droplets on quartz surface.

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Authors and Affiliations

  1. Tver State University, Tver, 170002, Russia

    V. M. Samsonov, I. A. Kaplunov, A. M. Ivanov, I. V. Talyzin & S. A. Tretyakov

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  1. V. M. Samsonov
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  2. I. A. Kaplunov
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  3. A. M. Ivanov
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  4. I. V. Talyzin
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  5. S. A. Tretyakov
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Correspondence to V. M. Samsonov.

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Original Russian Text © V.M. Samsonov, I.A. Kaplunov, A.M. Ivanov, I.V. Talyzin, S.A. Tretyakov, 2018, published in Kolloidnyi Zhurnal, 2018, Vol. 80, No. 3, pp. 315–323.

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Samsonov, V.M., Kaplunov, I.A., Ivanov, A.M. et al. On the Problem of the Relationship between the Contact Angle and Surface Roughness Coefficient: Quartz Wettability with Melted Germanium. Colloid J 80, 298–305 (2018). https://doi.org/10.1134/S1061933X18030110

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  • DOI: https://doi.org/10.1134/S1061933X18030110

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