Data di Pubblicazione:
2023
Citazione:
Electric-field frictional effects in confined zwitterionic molecules / M.M. Gianetti, R. Guerra, A. Vanossi, M. Urbakh, N. Manini. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 25:28(2023 Jul 28), pp. 19037-19045. [10.1039/d3cp00914a]
Abstract:
We theoretically explore the effect of a transverse electric field on the frictional response of a bi-layer of packed zwitterionic molecules. The dipole-moment reorientation promoted by the electric field can lead to either stick-slip or smooth sliding dynamics, with average shear stress values varying over a wide range. A structure-property relation is revealed by investigating the array of molecules and their mutual orientation and interlocking. Moreover, the thermal friction enhancement previously observed in these molecules is shown to be suppressed by the electric field, recovering the expected thermolubricity at large-enough fields. The same holds for other basic tribological quantities, such as the external load, which can influence friction in opposite ways depending on the strength of the applied electric field. Our findings open a route for the reversible control of friction forces via electric polarization of the sliding surface.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
friction; zwitterionic molecules; electric field
Elenco autori:
M.M. Gianetti, R. Guerra, A. Vanossi, M. Urbakh, N. Manini
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