Static Friction of Agar Gels: Formation of Contact Junctions at Frictional Interface

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  • Nitta Takahiro
    Division of Physics, Graduate School of Science, Hokkaido University
  • Kato Hideaki
    Division of Physics, Graduate School of Science, Hokkaido University
  • Haga Hisashi
    Division of Biological Sciences, Graduate School of Science, Hokkaido University
  • Nemoto Koji
    Division of Physics, Graduate School of Science, Hokkaido University
  • Kawabata Kazushige
    Division of Biological Sciences, Graduate School of Science, Hokkaido University

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説明

We measure the static friction Fc of agar gels on glass substrates immersed in water. Fc is independent of the nominal contact area, and increases with the normal load and the duration tw of contact prior to sliding. Using a confocal laser-scanning microscope, many fine dark spots are clearly visible in the optical reflection distribution images on the glass interface in contact with the gel. The total area of the dark spots increases with tw, corresponding qualitatively to that of Fc. These observations indicate that Fc originates from the formation of the contacting spots at the interface, which is not due to asperities of the gel surface alone but related to the drainage of water trapped by the gel polymer network at the frictional interface.

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