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Directional photo-transportation on micro solid particles in a solution: A novel application of visible laser

Recently, We noticed that microscopic particles of graphite move randomly in a solution containing ethanol. The motion of the graphite particles exhibits the characteristics as an active Brownian motion being different from the fluctuation under thermal equilibrium. We have tried to cause directional motion of the graphite particles by using laser. Here, we report our successful observation on the generation of directional flow with the irradiation of laser (wave length 532 nm). We will argue the mechanism of the occurrence of the vectorial motion in terms of the effect of local heating on the graphite particles.