- Title
- Nanotribology of ionic liquids as lubricant additives for alumina surfaces
- Creator
- Cowie, Stephen; Cooper, Peter K.; Atkin, Rob; Li, Hua
- Relation
- Funding BodyARCGrant NumberDP120102708 http://purl.org/au-research/grants/arc/DP120102708
- Relation
- Journal of Physical Chemistry Part C Vol. 121, Issue 51, p. 28348-28353
- Publisher Link
- http://dx.doi.org/10.1021/acs.jpcc.7b09879
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2017
- Description
- Common lubricants, optimized for steel, perform poorly for alumina surfaces, making ionic liquids (ILs) attractive potential alternatives, either in neat form or as oil additives. Here, atomic force microscopy (AFM) has been used to study the lubricity of two oil-miscible ILs between a silicon AFM tip and an alumina surface. Trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl)phosphinate (P₆,₆,₆,₁₄(ⁱC₈)₂PO₂) and trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate (P₆,₆,₆,₁₄DEHP) were mixed with hexadecane at concentrations from 0 to 100 mol % IL. Both ILs are effective lubricants for alumina, reducing lateral forces to approximately one third of the forces measured in hexadecane. When used as an additive in hexadecane, increasing the IL concentration generally decreased the friction, as the IL adsorbs on alumina and forms a strong boundary layer. P₆,₆,₆,₁₄DEHP mixtures reduce friction more effectively than P₆,₆,₆,₁₄(ⁱC₈)₂PO₂. For both ILs, a 2 mol % mixture of IL and hexadecane reduced friction most effectively, even more than the neat IL.
- Subject
- ionic liquids; atomic force microscopy; lubricants
- Identifier
- http://hdl.handle.net/1959.13/1385540
- Identifier
- uon:32244
- Identifier
- ISSN:1932-7447
- Language
- eng
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