Structural-induced lubricity of liquid crystal nanomaterials of cholesterol at metal friction

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Abstract

Experimentally, it was found that with the change in temperature there is a structural-induced increase in the lubricating capacity of liquid-crystal nanomaterials induced by transformations in the cholesteric mesophase. It is shown that in this temperature range, the minimum values of the friction coefficient practically coincide with the peak values of the dynamic viscosity, which together indicates in favor of the ordered state of the cholesterol liquid-crystal structures at these temperatures. As a result, it can be assumed that in this temperature range, spirally twisted layers of liquid-crystal cholesterol molecules with high antifriction action are formed in the friction zone. It is noted that the thickness of the friction-implemented cholesteric liquid-crystal films is sensitive to temperature changes in the contact area, changing the color and energy loss.

About the authors

V. I. Kolesnikov

Rostov State Transport University

Author for correspondence.
Email: rek@rgups.ru

Academician of the Russian Academy of Sciences

Russian Federation, 2, Rostovskogo Strelkovogo Polka Narodnogo Opolcheniya sq., Rostov-on-Don, 344038

S. F. Ermakov

Francisk Skorina Gomel State University

Email: rek@rgups.ru
Belarus, 104, Sovetskaya str., Gomel, 246019

E. B. Shershnev

Francisk Skorina Gomel State University

Email: rek@rgups.ru
Belarus, 104, Sovetskaya str., Gomel, 246019

A. P. Sychev

Federal State Budget Institution of Science "Federal Research Center The Southern Scientific Centre of the Russian Academy of Sciences"

Email: rek@rgups.ru
Russian Federation, 41, Chekhova street, Rostov-on-Don, 344006

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