Effect of the Contact Line Motion in the Adhesion of Very Soft Sphere

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  • Morishita Yoshihiro
    Department of Applied Physics, The University of Tokyo
  • Morita Hiroshi
    Nanosimulation Research Group, Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Doi Masao
    Department of Applied Physics, The University of Tokyo

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The dynamics of adhesion and detachment between soft poly(dimethylsiloxane) (PDMS) sphere and glass substrate was studied experimentally. The force, contact radius and contact angle were measured when the PDMS sphere is pressed against and pulled off from the glass substrate with various loading speeds. It is shown that (1) the force can be predicted accurately by the extended JKR theory which uses the apparent surface energy wapp, (2) the apparent surface energy wapp depends only on the velocity of the contact line, and does not depend on the loading speed except during the period where the contact angle changes rapidly, and (3) the integral of the apparent surface energy with respect to the contact area in the adhesion-detachment cycle is approximately equal to the work done to the system by the load. These results indicate that the adhesion-detatchment dynamics of the PDMS sphere is essentially governed by the local energy dissipation caused by the motion of the contact line.

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