Droplet generating device for droplet-based μtAS using electro-conjugate fluid

Y. Iijima, K. Takemura, K. Edamura

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Droplet-based μTAS, which carries out biochemical inspection and synthesis by handling samples as droplets on a single chip, has been attracting attentions in recent years. Although miniaturization of a chip is progressed, there are some problems in miniaturization of a whole system because of the necessity to connect syringe pumps to the chip. Thus, this study aims to realize a novel droplets generating device for droplet-based μTAS using electro-conjugate fluid (ECF). The ECF is a dielectric liquid generating a powerful flow when subjected to high DC voltage. The ECF flow generation allows us to realize a tiny hydraulic power source. Using the ECF flow, we can develop a droplet generating device for droplet-based μTAS by placing minute electrode pairs in flow channels. The device contains two channels filled with the ECF, which are dispersed and continuous phases meeting at a T-junction. When a sample in the dispersed phase is injected by the ECF flow to the continuous phase at T-junction, droplets are generated by shearing force between the two phases. We conducted droplet generating experiment and confirmed that droplets are successfully generated when the flow rate of the continuous phase is between 90 and 360 mm3 s-1, and the flow rate of the dispersed phase is between 10 and 40 mm3 s-1. We also confirmed that the droplet diameter and the droplet production rate are controllable by tuning the applied voltage to the electrode pairs.

Original languageEnglish
Article number054002
JournalSmart Materials and Structures
Issue number5
Publication statusPublished - 2017 Apr 6


  • droplet generation
  • electro-conjugate fluid
  • electrohydrodynamics
  • functional fluid
  • micro total analysis system

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Signal Processing
  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Electrical and Electronic Engineering
  • Civil and Structural Engineering


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