Exploring pulse-voltage-triggered optically induced electrohydrodynamic instability for femtolitre droplet generation

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Feifei Wang
  • Fei Fei
  • Lianqing Liu
  • Haibo Yu
  • Peng Yu
  • Yuechao Wang
  • Gwo-Bin Lee

Detail(s)

Original languageEnglish
Article number264103
Journal / PublicationApplied Physics Letters
Volume104
Issue number26
Publication statusPublished - 2014

Link(s)

Abstract

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. © 2014 AIP Publishing LLC.

Research Area(s)

Citation Format(s)

Exploring pulse-voltage-triggered optically induced electrohydrodynamic instability for femtolitre droplet generation. / Wang, Feifei; Fei, Fei; Liu, Lianqing et al.
In: Applied Physics Letters, Vol. 104, No. 26, 264103, 2014.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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