Controlling negative and positive photothermal migration of centimeter-sized droplets
Controlling negative and positive photothermal migration of centimeter-sized droplets
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DOI：
10.1103/physreve.88.012403
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发表时间：
2013-07-18
影响因子：
2.4
通讯作者：
Yoshikawa, Kenichi
中科院分区：
文献类型：
--
作者：
Ichikawa, Masatoshi;Takabatake, Fumi;Yoshikawa, Kenichi
报道了在绿色激光局部照射下水溶液上油滴的光致运动。结果表明，在纯水中产生排斥力，而在含有表面活性剂的水溶液中观察到吸引力。驱动力根据热马兰戈尼效应进行讨论。通过考虑激光局部加热下表面张力的空间梯度引起的平流来解释光热效应的切换。数值模型表明，液滴周围表面张力的几何轮廓决定了液滴周围的平流模式，并导致迁移方向的切换。
The photoinduced motion of an oil droplet on an aqueous solution under local irradiation by a green laser is reported. The results showed that a repulsive force is generated on pure water, while an attractive force is observed with an aqueous solution containing a surfactant. The driving force is discussed in terms of a thermal Marangoni effect. The switching on the photothermal effect is interpreted by taking into account the advection caused by the spatial gradient of the surface tension under local heating by a laser. A numerical model revealed that the geometrical profile of the surface tension around the droplet determines the mode of advection around the droplet and causes switching in the direction of migrations.