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

Hibiki Yoshimura; Daiki Tanaka; Masahiro Furuya; Tetsushi Sekiguchi; Shuichi Shoji

doi:10.3390/mi13010009

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 journal › Article › peer-review

Abstract

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 language	English
Article number	9
Journal	Micromachines
Volume	13
Issue number	1
DOIs	https://doi.org/10.3390/mi13010009
Publication status	Published - 2022 Jan

Keywords

Microdroplets
Parallel flow
Passive
Rotation

ASJC Scopus subject areas

Control and Systems Engineering
Mechanical Engineering
Electrical and Electronic Engineering

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10.3390/mi13010009

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title = "Controlling microdroplet inner rotation by parallel carrier flow of sesame and silicone oils",

abstract = "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.",

keywords = "Microdroplets, Parallel flow, Passive, Rotation",

author = "Hibiki Yoshimura and Daiki Tanaka and Masahiro Furuya and Tetsushi Sekiguchi and Shuichi Shoji",

note = "Funding Information: Funding: This work was supported by the Japan Ministry of Education, Culture, Sports Science &Technology (MEXT), Grant-in-Aid for Scientific Basic Research (A) No. 20H00336, and the MEXT Nanotechnology Platform Support Project of Waseda University. Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2022",

month = jan,

doi = "10.3390/mi13010009",

language = "English",

volume = "13",

journal = "Micromachines",

issn = "2072-666X",

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AU - Yoshimura, Hibiki

AU - Tanaka, Daiki

AU - Furuya, Masahiro

AU - Sekiguchi, Tetsushi

AU - Shoji, Shuichi

N1 - Funding Information: Funding: This work was supported by the Japan Ministry of Education, Culture, Sports Science &Technology (MEXT), Grant-in-Aid for Scientific Basic Research (A) No. 20H00336, and the MEXT Nanotechnology Platform Support Project of Waseda University. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/1

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N2 - 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.

AB - 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.

KW - Microdroplets

KW - Parallel flow

KW - Passive

KW - Rotation

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

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Keywords

ASJC Scopus subject areas

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