Controlling microdroplet inner rotation by parallel carrier flow of sesame and silicone oils

Hibiki Yoshimura*, Daiki Tanaka, Masahiro Furuya, Tetsushi Sekiguchi, Shuichi Shoji

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We developed a method for passively controlling microdroplet rotation, including interior rotation, using a parallel flow comprising silicone and sesame oils. This device has a simple 2D structure with a straight channel and T-junctions fabricated from polydimethylsiloxane. A micro-droplet that forms upstream moves into the sesame oil. Then, the largest flow velocity at the interface of the two oil layers applies a rotational force to the microdroplet. A microdroplet in the lower oil rotates clockwise while that in the upper oil rotates anti-clockwise. The rotational direction was controlled by a simple combination of sesame and silicone oils. Droplet interior flow was visualized by tracking microbeads inside the microdroplets. This study will contribute to the efficient creation of chiral molecules for pharmaceutical and materials development by controlling rotational direction and speed.

Original languageEnglish
Article number9
Issue number1
Publication statusPublished - 2022 Jan


  • Microdroplets
  • Parallel flow
  • Passive
  • Rotation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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