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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 lowvelocity region, was detected by the addition of a surfactant to the water medium. This frictiondoi:10.1088/0953-8984/23/28/284107 pmid:21709329 fatcat:qqazgmytvvd3jkrhiqazasdkpq