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Electrotunable Lubricity with Ionic Liquid Nanoscale Films

One of the main challenges in tribology is finding the way for an in situ control of friction without changing the lubricant. One of the ways for such control is via the application of electric fields. In this respect a promising new class of lubricants is ionic liquids, which are solvent-free elect...

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Autores principales: Fajardo, O. Y., Bresme, F., Kornyshev, A. A., Urbakh, M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4287750/
https://www.ncbi.nlm.nih.gov/pubmed/25572127
http://dx.doi.org/10.1038/srep07698
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author Fajardo, O. Y.
Bresme, F.
Kornyshev, A. A.
Urbakh, M.
author_facet Fajardo, O. Y.
Bresme, F.
Kornyshev, A. A.
Urbakh, M.
author_sort Fajardo, O. Y.
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description One of the main challenges in tribology is finding the way for an in situ control of friction without changing the lubricant. One of the ways for such control is via the application of electric fields. In this respect a promising new class of lubricants is ionic liquids, which are solvent-free electrolytes, and their properties should be most strongly affected by applied voltage. Based on a minimal physical model, our study elucidates the connection between the voltage effect on the structure of the ionic liquid layers and their lubricating properties. It reveals two mechanisms of variation of the friction force with the surface charge density, consistent with recent AFM measurements, namely via the (i) charge effect on normal and in-plane ordering in the film and (ii) swapping between anion and cation layers at the surfaces. We formulate conditions that would warrant low friction coefficients and prevent wear by resisting “squeezing-out” of the liquid under compression. These results give a background for controllable variation of friction.
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spelling pubmed-42877502015-02-23 Electrotunable Lubricity with Ionic Liquid Nanoscale Films Fajardo, O. Y. Bresme, F. Kornyshev, A. A. Urbakh, M. Sci Rep Article One of the main challenges in tribology is finding the way for an in situ control of friction without changing the lubricant. One of the ways for such control is via the application of electric fields. In this respect a promising new class of lubricants is ionic liquids, which are solvent-free electrolytes, and their properties should be most strongly affected by applied voltage. Based on a minimal physical model, our study elucidates the connection between the voltage effect on the structure of the ionic liquid layers and their lubricating properties. It reveals two mechanisms of variation of the friction force with the surface charge density, consistent with recent AFM measurements, namely via the (i) charge effect on normal and in-plane ordering in the film and (ii) swapping between anion and cation layers at the surfaces. We formulate conditions that would warrant low friction coefficients and prevent wear by resisting “squeezing-out” of the liquid under compression. These results give a background for controllable variation of friction. Nature Publishing Group 2015-01-09 /pmc/articles/PMC4287750/ /pubmed/25572127 http://dx.doi.org/10.1038/srep07698 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Fajardo, O. Y.
Bresme, F.
Kornyshev, A. A.
Urbakh, M.
Electrotunable Lubricity with Ionic Liquid Nanoscale Films
title Electrotunable Lubricity with Ionic Liquid Nanoscale Films
title_full Electrotunable Lubricity with Ionic Liquid Nanoscale Films
title_fullStr Electrotunable Lubricity with Ionic Liquid Nanoscale Films
title_full_unstemmed Electrotunable Lubricity with Ionic Liquid Nanoscale Films
title_short Electrotunable Lubricity with Ionic Liquid Nanoscale Films
title_sort electrotunable lubricity with ionic liquid nanoscale films
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4287750/
https://www.ncbi.nlm.nih.gov/pubmed/25572127
http://dx.doi.org/10.1038/srep07698
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