油水界面に生じる面内爆発現象を利用した微小物体駆動(機械要素,潤滑,工作,生産管理など)

概要

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An interfacial phenomenon has been investigated, which is caused by putting a droplet of surfactant solution at an oil-water interface. When a droplet of camphor solution is put into an oil-water interface, an "explosion phenomenon" occurs, in which the oil phase is broken with a phase transition within a short time, e.g. less than 1s in a system. The explosion phenomenon is repeated by putting another droplet, due to the sublimation of camphor. By using the explosion phenomenon with camphor solution, an impeller with a diameter of 5mm shows a rotational motion with a rotational speed of 1000 rpm, in which a reaction force of a jet by camphor solution is utilized. The direction and magnitude of the force generated by the explosion phenomena is controllable by giving an asymmetry of wetting property to a solid surface of an object, even if the shape of the surface is symmetric. In order to acquire a directional force with the asymmetry of wetting property, the gap between the wetting-controlled solid surface and an oil-water interface must be in a range, e.g.±0.7mm for the present experimental system.
一般社団法人日本機械学会の論文
2006-12-25