Microtribology of aqueous carbon nanotube dispersions

Handle URI:
http://hdl.handle.net/10754/561879
Title:
Microtribology of aqueous carbon nanotube dispersions
Authors:
Kristiansen, Kai De Lange; Zeng, Hongbo; Wang, Peng ( 0000-0003-0856-0865 ) ; Israelachvili, Jacob N.
Abstract:
The tribological behavior of carbon nanotubes (CNTs) in aqueous humic acid (HA) solutions was studied using a surface forces apparatus (SFA) and shows promising lubricant additive properties. Adding CNTs to the solution changes the friction forces between two mica surfaces from "adhesion controlled" to "load controlled" friction. The coefficient of friction with either single-walled (SW) or multi-walled (MW) CNT dispersions is in the range 0.30-0.55 and is independent of the load and sliding velocity. More importantly, lateral sliding promotes a redistribution or accumulation, rather than squeezing out, of nanotubes between the surfaces. This accumulation reduced the adhesion between the surfaces (which generally causes wear/damage of the surfaces), and no wear or damage was observed during continuous shearing experiments that lasted several hours even under high loads (pressures â∼10 MPa). The frictional properties can be understood in terms of the Cobblestone Model where the friction force is related to the fraction of the adhesion energy dissipated during impacts of the nanoparticles. We also develop a simple generic model based on the van der Waals interactions between particles and surfaces to determine the relation between the dimensions of nanoparticles and their tribological properties when used as additives in oil- or water-based lubricants. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Environmental Nanotechnology Lab
Publisher:
Wiley-Blackwell
Journal:
Advanced Functional Materials
Issue Date:
23-Sep-2011
DOI:
10.1002/adfm.201101478
Type:
Article
ISSN:
1616301X
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorKristiansen, Kai De Langeen
dc.contributor.authorZeng, Hongboen
dc.contributor.authorWang, Pengen
dc.contributor.authorIsraelachvili, Jacob N.en
dc.date.accessioned2015-08-03T09:33:09Zen
dc.date.available2015-08-03T09:33:09Zen
dc.date.issued2011-09-23en
dc.identifier.issn1616301Xen
dc.identifier.doi10.1002/adfm.201101478en
dc.identifier.urihttp://hdl.handle.net/10754/561879en
dc.description.abstractThe tribological behavior of carbon nanotubes (CNTs) in aqueous humic acid (HA) solutions was studied using a surface forces apparatus (SFA) and shows promising lubricant additive properties. Adding CNTs to the solution changes the friction forces between two mica surfaces from "adhesion controlled" to "load controlled" friction. The coefficient of friction with either single-walled (SW) or multi-walled (MW) CNT dispersions is in the range 0.30-0.55 and is independent of the load and sliding velocity. More importantly, lateral sliding promotes a redistribution or accumulation, rather than squeezing out, of nanotubes between the surfaces. This accumulation reduced the adhesion between the surfaces (which generally causes wear/damage of the surfaces), and no wear or damage was observed during continuous shearing experiments that lasted several hours even under high loads (pressures â∼10 MPa). The frictional properties can be understood in terms of the Cobblestone Model where the friction force is related to the fraction of the adhesion energy dissipated during impacts of the nanoparticles. We also develop a simple generic model based on the van der Waals interactions between particles and surfaces to determine the relation between the dimensions of nanoparticles and their tribological properties when used as additives in oil- or water-based lubricants. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en
dc.publisherWiley-Blackwellen
dc.subjectaqueous lubricanten
dc.subjectcarbon nanotubesen
dc.subjectmicrotribologyen
dc.titleMicrotribology of aqueous carbon nanotube dispersionsen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentEnvironmental Nanotechnology Laben
dc.identifier.journalAdvanced Functional Materialsen
dc.contributor.institutionDepartment of Chemical Engineering, University of California, Santa Barbara, CA 93106, United Statesen
dc.contributor.institutionDepartment of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canadaen
dc.contributor.institutionBren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United Statesen
dc.contributor.institutionDepartment of Chemical Engineering and Materials Department, University of California, Santa Barbara, CA 93106, United Statesen
kaust.authorWang, Pengen
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