期刊
RSC ADVANCES
卷 12, 期 1, 页码 413-419出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra08026a
关键词
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资金
- Welch Foundation [F-2002-20190330]
- National Science Foundation Faculty Early Career Development Program [2042304]
- Taiho Kogyo Tribology Research Foundation [20A03]
- 2018 Ralph E. Powe Junior Faculty Enhancement Award - Oak Ridge Associated Universities (ORAU)
- Walker Department of Mechanical Engineering
- Texas Materials Institute at the University of Texas at Austin
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [2042304] Funding Source: National Science Foundation
This study investigated the structural morphology of [P-6,P-6,P-6,P-14][DEHP] IL under different pressures using AFM experiments, revealing the formation of a lubricious, solid-like interfacial layer at higher pressures, with growth rate increasing with pressure and temperature. The structural variation was proposed to be derived from the well-ordered layering of polar groups of ions separated by apolar tails. These findings provide new insights into the pressure-dependent lubrication mechanisms of ILs.
In this work, we perform atomic force microscopy (AFM) experiments to evaluate in situ the dependence of the structural morphology of trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate ([P-6,P-6,P-6,P-14][DEHP]) ionic liquid (IL) on applied pressure. The experimental results obtained upon sliding a diamond-like-carbon-coated silicon AFM tip on mechanically polished steel at an applied pressure up to 5.5 +/- 0.3 GPa indicate a structural transition of confined [P-6,P-6,P-6,P-14][DEHP] molecules. This pressure-induced morphological change of [P-6,P-6,P-6,P-14][DEHP] IL leads to the generation of a lubricious, solid-like interfacial layer, whose growth rate increases with applied pressure and temperature. The structural variation of [P-6,P-6,P-6,P-14][DEHP] IL is proposed to derive from the well-ordered layering of the polar groups of ions separated by the apolar tails. These results not only shed new light on the structural organization of phosphonium-based ILs under elevated pressure, but also provide novel insights into the normal pressure-dependent lubrication mechanisms of ILs in general.
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