KAUST Grant NumberKUS-C1-018-02
MetadataShow full item record
AbstractSilica (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.
CitationKim D, Archer LA (2011) Nanoscale Organic−Inorganic Hybrid Lubricants. Langmuir 27: 3083–3094. Available: http://dx.doi.org/10.1021/la104937t.
SponsorsThis 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.
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
- Superhydrophobic and oleophobic surface from fluoropolymer-SiO2 hybrid nanocomposites.
- Authors: Wang L, Liang J, He L
- Issue date: 2014 Dec 1
- Structure and properties of polybenzimidazole/silica nanocomposite electrolyte membrane: influence of organic/inorganic interface.
- Authors: Singha S, Jana T
- Issue date: 2014 Dec 10
- Poly(alkyl methacrylate) Brush-Grafted Silica Nanoparticles as Oil Lubricant Additives: Effects of Alkyl Pendant Groups on Oil Dispersibility, Stability, and Lubrication Property.
- Authors: Seymour BT, Wright RAE, Parrott AC, Gao H, Martini A, Qu J, Dai S, Zhao B
- Issue date: 2017 Jul 26
- Graphene-ionic liquid based hybrid nanomaterials as novel lubricant for low friction and wear.
- Authors: Khare V, Pham MQ, Kumari N, Yoon HS, Kim CS, Park JI, Ahn SH
- Issue date: 2013 May 22
- Oil-Soluble Polymer Brush Grafted Nanoparticles as Effective Lubricant Additives for Friction and Wear Reduction.
- Authors: Wright RA, Wang K, Qu J, Zhao B
- Issue date: 2016 Jul 18