The authors demonstrate an optical manipulation mechanism of gas bubbles for microfluidic applications. Air bubbles in a silicone oil medium are manipulated via thermocapillary forces generated by the absorption of a laser in an amorphous silicon thin film. In contrast to previous demonstrations of optically controlled thermally driven bubble movement, transparent liquids can be used, as the thermal gradient is formed from laser absorption in the amorphous silicon substrate, and not in the liquid. A variety of bubbles with volumes ranging from 19 pl to 23 nl was transported at measured velocities of up to 1.5 mm/s.
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机译:作者展示了用于微流体应用的气泡的光学操纵机制。通过在非晶硅薄膜中吸收激光产生的热毛细作用力来控制硅油介质中的气泡。与光学控制的热驱动气泡运动的先前演示相反,可以使用透明液体,因为热梯度是由非晶硅基板中而不是液体中的激光吸收形成的。以高达1.5 mm / s的测得速度运输了体积范围从19 pl至23 nl的各种气泡。
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