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An, R., Zhou, G., Zhu, Y., Zhu, W., Huang, L. & Shah, F. U. (2018). Friction of Ionic Liquid–Glycol Ether Mixtures at Titanium Interfaces: Negative Load Dependence. Advanced Materials Interfaces, 5(14), Article ID 1800266.
Open this publication in new window or tab >>Friction of Ionic Liquid–Glycol Ether Mixtures at Titanium Interfaces: Negative Load Dependence
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2018 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 5, no 14, article id 1800266Article in journal (Refereed) Published
Abstract [en]

Structural reorientation of alkyl chains in the phosphonium cation of orthoborate ionic liquid mixed with glycol ether occurs with increasing normal load of the AFM tip. The flat reoriented structure, similar to the ‘blooming lotus leaf’, produces a new sliding interface that is responsible for the observed lower friction at higher loads. This work is reported by Rong An, Liangliang Huang, Faiz Ullah Shah and co‐workers in article number 1800263.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018
National Category
Chemical Sciences Physical Chemistry
Research subject
Chemistry of Interfaces; Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-70453 (URN)10.1002/admi.201870066 (DOI)
Available from: 2018-08-16 Created: 2018-08-16 Last updated: 2018-08-16Bibliographically approved
An, R., Zhou, G., Zhu, Y., Zhu, W., Huang, L. & Shah, F. U. (2018). Friction of Ionic Liquid–Glycol Ether Mixtures at Titanium Interfaces: Negative Load Dependence. Advanced Materials Interfaces, 5(14), Article ID 1800263.
Open this publication in new window or tab >>Friction of Ionic Liquid–Glycol Ether Mixtures at Titanium Interfaces: Negative Load Dependence
Show others...
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
National Category
Chemical Sciences Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-68631 (URN)10.1002/admi.201800263 (DOI)000439739000010 ()2-s2.0-85046361446 (Scopus ID)
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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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6582-5159

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