Microfluidic control on nanoplasmonic thin films using Marangoni effect
Microfluidic control on nanoplasmonic thin films using Marangoni effect
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DOI：
10.1117/1.jnp.10.033006
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发表时间：
2016-07-01
影响因子：
1.5
通讯作者：
Suzuki, Motofumi
中科院分区：
文献类型：
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作者：
Namura, Kyoko;Nakajima, Kaoru;Suzuki, Motofumi
利用热等离子体马兰戈尼效应证明了在充满水的薄微流控室中流动方向的快速切换。金岛薄膜用作热等离子体加热器，连续波激光聚焦在其上产生微泡并在其周围形成马兰戈尼流。观察到的流动方向随激光功率的变化而显著变化。当激光功率被方波调制时，流动方向会随着功率的变化而瞬间切换，从而形成聚苯乙烯微球的离散图案。当激光功率调制频率高达40 Hz时，观察到流动方向切换，表明流动方向切换的时间常数至少在几毫秒量级。这种快速的流动方向转换归因于金纳米颗粒的热等离子体效应和气泡表面的马兰戈尼效应的快速响应。(C) 2016年中国光学仪器工程师学会（SPIE）
The rapid switching of flow direction in a thin microfluidic chamber filled with water is demonstrated using the thermoplasmonic Marangoni effect. A gold island film is used as a thermoplasmonic heater on which a continuous-wave laser is focused to generate a microbubble and develop Marangoni flows around it. The direction of the observed flow significantly changes depending on the laser power. When the laser power is square-wave modulated, the flow direction instantaneously switches in response to the power, creating a discrete pattern of polystyrene microspheres. Flow direction-switching is observed for laser power modulation frequencies of up to 40 Hz, which indicates that the time constant of the flow direction switching is on the order of at least several milliseconds. This rapid flow direction switching is attributed to the fast response of both the thermoplasmonic effect of the gold nanoparticles and the Marangoni effect on the bubble surface. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)