| Literature DB >> 26276199 |
R M Espinosa-Marzal1, A Arcifa1, A Rossi1,2, N D Spencer1.
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.Entities:
Keywords: crackling noise systems; friction; ionic liquids; nanoconfined liquids; stick−slip; surface forces apparatus; water
Year: 2013 PMID: 26276199 DOI: 10.1021/jz402451v
Source DB: PubMed Journal: J Phys Chem Lett ISSN: 1948-7185 Impact factor: 6.475