Exploring pulse-voltage-triggered optically induced electrohydrodynamic instability for femtolitre droplet generation
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| 第一作者： |
Wang FF(王飞飞);Fei, Fei;Liu LQ(刘连庆);Yu HB(于海波);Yu P(于鹏);Wang YC(王越超);Lee, Gwo-Bin;Li WR(李文荣) |
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| 发表年度： |
2014 |
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26 |
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104 |
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| 摘要： |
We present a multipoint "virtual dispenser" to draw femtolitre droplets from a dielectric fluidic thin film using pulse-voltage-triggered optically induced electrohydrodynamic instability (PVT-OEHI). The "virtual dispenser" generates instability nucleation sites by controlling the optically induced lateral electrical stress and thermocapillary flow inside an optoelectronics chip. A time scale analysis shows that the electrohydrodynamic (EHD) instability phenomenon is present; however, its external manifestation is suppressed by OEHI. We observed two droplet dispensing mechanisms which correspond to different EHD states: Taylor cone formation and optically induced EHD jet. The EHD states transition could be realized by adjusting the pulse voltage parameters to alter the morphology of dispensed micron-scale polymer droplets, which could then be formed into organized arrays of microlenses with controllable diameter and curvature based on surface tension effect. |
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APPLIED PHYSICS LETTERS |
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