Handle URI:
http://hdl.handle.net/10754/598951
Title:
Nanoscale Organic−Inorganic Hybrid Lubricants
Authors:
Kim, Daniel; Archer, Lynden A.
Abstract:
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.
Publisher:
American Chemical Society (ACS)
Journal:
Langmuir
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
15-Mar-2011
DOI:
10.1021/la104937t
PubMed ID:
21280594
Type:
Article
ISSN:
0743-7463; 1520-5827
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.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorKim, Danielen
dc.contributor.authorArcher, Lynden A.en
dc.date.accessioned2016-02-25T13:44:20Zen
dc.date.available2016-02-25T13:44:20Zen
dc.date.issued2011-03-15en
dc.identifier.citationKim D, Archer LA (2011) Nanoscale Organic−Inorganic Hybrid Lubricants. Langmuir 27: 3083–3094. Available: http://dx.doi.org/10.1021/la104937t.en
dc.identifier.issn0743-7463en
dc.identifier.issn1520-5827en
dc.identifier.pmid21280594en
dc.identifier.doi10.1021/la104937ten
dc.identifier.urihttp://hdl.handle.net/10754/598951en
dc.description.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.en
dc.description.sponsorshipThis 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.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleNanoscale Organic−Inorganic Hybrid Lubricantsen
dc.typeArticleen
dc.identifier.journalLangmuiren
dc.contributor.institutionCornell University, Ithaca, United Statesen
kaust.grant.numberKUS-C1-018-02en
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