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Friction of Ionic Liquid–Glycol Ether Mixtures at Titanium Interfaces: Negative Load Dependence
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing.ORCID iD: 0000-0001-6582-5159
School of Chemical Biological and Materials Engineering, University of Oklahoma.
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University.
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University.
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2018 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 5, no 14, article id 1800263Article in journal (Refereed) Published
Abstract [en]

The atomic force microscopy experiments and nonequilibrium molecular dynamics (NEMD) simulations demonstrate a negative friction–load dependence to ionic liquid–glycol ether mixtures, that is, the friction decreases as the normal load increases. NEMD simulations reveal a structural reorientation of the studied ionic liquid (IL): as the normal load increases, the cation alkyl chains of ILs change the orientation to preferentially parallel to the tip scanning path. The flat‐oriented IL structures, similar to the “blooming lotus leaf,” produce a new sliding interface and reduce the friction. A further molecular dynamics simulation is carried out by adopting slit‐pore models to mimic the tip approaching process to confirm the dynamics of ILs. A faster diffusion of ILs in the smaller slit pore is observed. The faster diffusion of ILs in the more confined slit pore facilitates the structural reorientation of ILs. The resulted new sliding surface is responsible for the observed smaller friction at higher loads, also known as the negative friction–load dependence. These findings provide a fundamental explanation to the role of ILs in interfacial lubrications. They help to understand liquid flow properties under confinement, with implications for the development of better nanofluidic devices.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018. Vol. 5, no 14, article id 1800263
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Chemical Sciences Physical Chemistry
Research subject
Chemistry of Interfaces
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URN: urn:nbn:se:ltu:diva-68631DOI: 10.1002/admi.201800263ISI: 000439739000010Scopus ID: 2-s2.0-85046361446OAI: oai:DiVA.org:ltu-68631DiVA, id: diva2:1203861
Note

Validerad;2018;Nivå 2;2018-07-24 (inah)

Available from: 2018-05-04 Created: 2018-05-04 Last updated: 2018-08-21Bibliographically approved

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An, RongShah, Faiz Ullah

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