Microslips to "avalanches" in confined, molecular layers of ionic liquids

R. M. Espinosa-Marzal; A. Arcifa; A. Rossi; N. D. Spencer

doi:10.1021/jz402451v

Microslips to "avalanches" in confined, molecular layers of ionic liquids

R. M. Espinosa-Marzal, A. Arcifa, A. Rossi, N. D. Spencer

Research output: Contribution to journal › Article › peer-review

Abstract

We have measured forces between mica surfaces across two hydrophobic ionic liquids with a surface forces apparatus. Both surface-adsorbed water and alkyl-chain length on the imidazolium cation influence the structure of the nanoconfined film and the dynamics of film-thickness transitions. Friction shows accumulative microslips as precursors to collective "avalanches" that abruptly reduce friction momentarily. This behavior is interpreted as a consequence of interlayer ion correlations within the 1 to 2 nm thick film; we identify this to be analogous to the friction response of crackling noise systems over a broad range of sizes.

Original language	English (US)
Pages (from-to)	179-184
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	5
Issue number	1
DOIs	https://doi.org/10.1021/jz402451v
State	Published - Jan 2 2014

Keywords

crackling noise systems
friction
ionic liquids
nanoconfined liquids
stick-slip
surface forces apparatus
water

ASJC Scopus subject areas

General Materials Science
Physical and Theoretical Chemistry

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10.1021/jz402451v

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AU - Espinosa-Marzal, R. M.

AU - Arcifa, A.

AU - Rossi, A.

AU - Spencer, N. D.

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N2 - We have measured forces between mica surfaces across two hydrophobic ionic liquids with a surface forces apparatus. Both surface-adsorbed water and alkyl-chain length on the imidazolium cation influence the structure of the nanoconfined film and the dynamics of film-thickness transitions. Friction shows accumulative microslips as precursors to collective "avalanches" that abruptly reduce friction momentarily. This behavior is interpreted as a consequence of interlayer ion correlations within the 1 to 2 nm thick film; we identify this to be analogous to the friction response of crackling noise systems over a broad range of sizes.

AB - We have measured forces between mica surfaces across two hydrophobic ionic liquids with a surface forces apparatus. Both surface-adsorbed water and alkyl-chain length on the imidazolium cation influence the structure of the nanoconfined film and the dynamics of film-thickness transitions. Friction shows accumulative microslips as precursors to collective "avalanches" that abruptly reduce friction momentarily. This behavior is interpreted as a consequence of interlayer ion correlations within the 1 to 2 nm thick film; we identify this to be analogous to the friction response of crackling noise systems over a broad range of sizes.

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KW - stick-slip

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Microslips to "avalanches" in confined, molecular layers of ionic liquids

Abstract

Keywords

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