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Surfactant-Induced Friction Reduction for Hydrogels in the Boundary Lubrication Regime

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Title: Surfactant-Induced Friction Reduction for Hydrogels in the Boundary Lubrication Regime
Authors: Kamada, Kosuke Browse this author
Furukawa, Hidemitsu Browse this author
Kurokawa, Takayuki Browse this author
Tada, Tomohiro Browse this author
Tominaga, Taiki Browse this author
Nakano, Yukihiro Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: 26-Nov-2010
Publisher: IOP Publishing
Journal Title: Journal of Physics: Condensed Matter
Volume: 23
Issue: 28
Publisher DOI: 10.1088/0953-8984/23/28/284107
PMID: 21709329
Abstract: We studied the ability of surfactants to reduce friction by boundary lubrication for a bulk hydrogel sliding on a solid surface in aqueous solution. A piece of negatively charged polyelectrolyte hydrogel was slid across solid surfaces with various levels of hydrophobicity, using a strain-controlled parallel-plate rheometer in water. A dramatic reduction in the sliding friction, especially in the low-velocity region, was detected by the addition of a surfactant to the water medium. This friction reduction was only observed in gel.solid friction but not in solid.solid friction, indicating that the soft and wet nature of the gel surface was crucial for this surfactant-induced friction reduction. This phenomenon reveals that surfactants can remain at the gel-mated interface, thus preventing direct interfacial interaction between the sliding surfaces, and significantly decreases the frictional stress. The reported dramatic reduction in friction highlights the frictional characteristics of soft and wet hydrogel materials.
Rights: Copyright © (2011) IOP Publishing Ltd.
Type: article (author version)
URI: http://hdl.handle.net/2115/44831
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔 剣萍 (Gong Jian Ping)

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