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The primary results of investigations of the surface tension (ST) of indium for the last six decades are considered in this review, and original data on the temperature dependence of the ST of indium obtained by authors using the sessile large drop and maximal drop pressure methods are given. Primary attention is paid to analyzing the possible methodological drawbacks of experimental studies, in which surface tension values of pure indium and some other metals, significantly exceeding the ST data, determined by traditional classic meth ods, are obtained. In the authors' opinion, the cleaning of the studied metal surfaces by heavy ion bombard ments of inert gases, which is used in similar works, cannot guarantee obtaining true surface tension values.

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The paper presents the measured data on interfacial tension of bentonite suspensions and strength of a cement stone in water solutions of Frem Giper S-TB superplasticizer. The interfacial tension of water-surfactant-bentonite suspension is experimentally measured at various concentrations of a bentonite solid phase. The dependence of interfacial tension on the concentration of a solid phase is quite complex. In particular, the minimum is observed on interfacial tension isotherms at 3 wt.% of bentonite. Isoplastic cement mixes are obtained from the above suspensions. The cement stone samples are made of these mixes. The strength test of these samples showed a considerable increase of the compression strength. At the same time, 3 wt.% of bentonite demonstrated the maximum increase in strength.

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