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Nanoscale Lubrication of Ionic Surfaces Controlled via a Strong Electric Field

Frictional forces arise whenever objects around us are set in motion. Controlling them in a rational manner means gaining leverage over mechanical energy losses and wear. This paper presents a way of manipulating nanoscale friction by means of in situ lubrication and interfacial electrochemistry. Wa...

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Autores principales: Strelcov, Evgheni, Kumar, Rajeev, Bocharova, Vera, Sumpter, Bobby G., Tselev, Alexander, Kalinin, Sergei V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4306914/
https://www.ncbi.nlm.nih.gov/pubmed/25623295
http://dx.doi.org/10.1038/srep08049
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author Strelcov, Evgheni
Kumar, Rajeev
Bocharova, Vera
Sumpter, Bobby G.
Tselev, Alexander
Kalinin, Sergei V.
author_facet Strelcov, Evgheni
Kumar, Rajeev
Bocharova, Vera
Sumpter, Bobby G.
Tselev, Alexander
Kalinin, Sergei V.
author_sort Strelcov, Evgheni
collection PubMed
description Frictional forces arise whenever objects around us are set in motion. Controlling them in a rational manner means gaining leverage over mechanical energy losses and wear. This paper presents a way of manipulating nanoscale friction by means of in situ lubrication and interfacial electrochemistry. Water lubricant is directionally condensed from the vapor phase at a moving metal-ionic crystal interface by a strong confined electric field, thereby allowing friction to be tuned up or down via an applied bias. The electric potential polarity and ionic solid solubility are shown to strongly influence friction between the atomic force microscope (AFM) tip and salt surface. An increase in friction is associated with the AFM tip digging into the surface, whereas reducing friction does not influence its topography. No current flows during friction variation, which excludes Joule heating and associated electrical energy losses. The demonstrated novel effect can be of significant technological importance for controlling friction in nano- and micro-electromechanical systems.
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spelling pubmed-43069142015-02-06 Nanoscale Lubrication of Ionic Surfaces Controlled via a Strong Electric Field Strelcov, Evgheni Kumar, Rajeev Bocharova, Vera Sumpter, Bobby G. Tselev, Alexander Kalinin, Sergei V. Sci Rep Article Frictional forces arise whenever objects around us are set in motion. Controlling them in a rational manner means gaining leverage over mechanical energy losses and wear. This paper presents a way of manipulating nanoscale friction by means of in situ lubrication and interfacial electrochemistry. Water lubricant is directionally condensed from the vapor phase at a moving metal-ionic crystal interface by a strong confined electric field, thereby allowing friction to be tuned up or down via an applied bias. The electric potential polarity and ionic solid solubility are shown to strongly influence friction between the atomic force microscope (AFM) tip and salt surface. An increase in friction is associated with the AFM tip digging into the surface, whereas reducing friction does not influence its topography. No current flows during friction variation, which excludes Joule heating and associated electrical energy losses. The demonstrated novel effect can be of significant technological importance for controlling friction in nano- and micro-electromechanical systems. Nature Publishing Group 2015-01-27 /pmc/articles/PMC4306914/ /pubmed/25623295 http://dx.doi.org/10.1038/srep08049 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-sa/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 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-nc-sa/4.0/
spellingShingle Article
Strelcov, Evgheni
Kumar, Rajeev
Bocharova, Vera
Sumpter, Bobby G.
Tselev, Alexander
Kalinin, Sergei V.
Nanoscale Lubrication of Ionic Surfaces Controlled via a Strong Electric Field
title Nanoscale Lubrication of Ionic Surfaces Controlled via a Strong Electric Field
title_full Nanoscale Lubrication of Ionic Surfaces Controlled via a Strong Electric Field
title_fullStr Nanoscale Lubrication of Ionic Surfaces Controlled via a Strong Electric Field
title_full_unstemmed Nanoscale Lubrication of Ionic Surfaces Controlled via a Strong Electric Field
title_short Nanoscale Lubrication of Ionic Surfaces Controlled via a Strong Electric Field
title_sort nanoscale lubrication of ionic surfaces controlled via a strong electric field
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4306914/
https://www.ncbi.nlm.nih.gov/pubmed/25623295
http://dx.doi.org/10.1038/srep08049
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