Type
ArticleAuthors
Kim, DanielArcher, Lynden A.

KAUST Grant Number
KUS-C1-018-02Date
2011-03-15Permanent link to this record
http://hdl.handle.net/10754/598951
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Silica (SiO2) nanoparticles densely grafted with amphiphilic organic chains are used to create a family of organic-inorganic hybrid lubricants. Short sulfonate-functionalized alkylaryl chains covalently tethered to the particles form a dense corona brush that stabilizes them against aggregation. When these hybrid particles are dispersed in poly-α-olefin (PAO) oligomers, they form homogeneous nanocomposite fluids at both low and high particle loadings. By varying the volume fraction of the SiO2 nanostructures in the PAO nanocomposites, we show that exceptionally stable hybrid lubricants can be created and that their mechanical properties can be tuned to span the spectrum from simple liquids to complex gels. We further show that these hybrid lubricants simultaneously exhibit lower interfacial friction coefficients, enhanced wear and mechanical properties, and superior thermal stability in comparison with either PAO or its nanocomposites created at low nanoparticle loadings. Profilometry and energy dispersive X-ray spectroscopic analysis of the wear track show that the enhanced wear characteristics in PAO-SiO2 composite lubricants originate from two sources: localization of the SiO2 particles into the wear track and extension of the elastohydrodynamic lubrication regime to Sommerfeld numbers more than an order of magnitude larger than for PAO. © 2011 American Chemical Society.Citation
Kim D, Archer LA (2011) Nanoscale Organic−Inorganic Hybrid Lubricants. Langmuir 27: 3083–3094. Available: http://dx.doi.org/10.1021/la104937t.Sponsors
This work was supported by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST), and by SUMMIT Lubricants, Inc. (ID071210). The authors are grateful to Chevron-Phillips for Synfluid PAO and to Oil-Chem Technologies for supplying the material XSA-1416.Publisher
American Chemical Society (ACS)Journal
LangmuirPubMed ID
21280594ae974a485f413a2113503eed53cd6c53
10.1021/la104937t
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