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26 April 1996 Spontaneous motion of polymer gels on water
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We have discovered that cross-linked polymer gels with hydrophobicity swollen in organic solvent undergo spontaneous motion when immersed in water. The mode of motion largely depends on the shape of the gel: a disc-shaped gel exhibits translational motion while a triangular or a square-shaped one exhibits rotation. The velocity and duration of gel motion are strongly associated with its size and chemical structure. The larger the gel, the longer the gel can keep motion. The mechanism of the gel motion on water has been investigated and we have found that the driven force of motion is from the surface spreading of organic solvent on water surface.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Matsumoto, Jianping Gong, and Yoshihito Osada "Spontaneous motion of polymer gels on water", Proc. SPIE 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials, (26 April 1996);

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