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Micromachines 2015, 6(10), 1526-1533; doi:10.3390/mi6101436

Observation and Manipulation of a Capillary Jet in a Centrifuge-Based Droplet Shooting Device

1
Institute of Industrial Science, the University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
2
Takeuchi Biohybrid Innovation Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology (JST), Komaba Open Laboratory (KOL) Room M202, 4-6-1, Komaba, Meguro-ku, Tokyo 153–8904, Japan
3
Department of Computational Intelligence and Systems Science, Tokyo Institute of Technology, 4259-G3-53 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan
Present address: Department of Mechanical Engineering, California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA.
Present address: Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama, Kanagawa, 223-8522, Japan.
*
Author to whom correspondence should be addressed.
Academic Editor: Marc Madou
Received: 1 September 2015 / Accepted: 3 October 2015 / Published: 10 October 2015
(This article belongs to the Special Issue Centrifugal (Compact-Disc) Microfluidics for Extreme POC)
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Abstract

We report observation and manipulation of a capillary jet under ultra-high centrifugal gravity in a proposed capillary-based fluidic device for the synthesis of microparticles in a centrifugal tube called Centrifuge-Based Droplet Shooting Device (CDSD). Using a high-speed camera, we directly observed the dripping to jetting transition of a viscous capillary jet of water and Sodium alginate solution generated from a glass capillary-orifice of a diameter of O (100) m under centrifugal gravity ranging from 190 to 450 g. A non-dimensional analysis shows that the mechanism of the dripping-jetting transition in the CDSD may follow that previously reported for a dripping faucet under standard gravity. We also fabricated calcium alginate microparticles by gelating droplets of sodium alginate solution obtained in the break-up of the capillary jet in the jetting regime and demonstrated fabrication of microbeads-on-a-string structures. We confirmed that the jetting regime of the capillary jet could be used to fabricate smaller particles than that of the dripping regime. The results show that the CDSD would be a more useful device to fabricate various polymeric structures and understand the physics of fluid jets under ultra-high gravity. View Full-Text
Keywords: microfluidics; centrifuge; high-speed visualization; polymeric particles microfluidics; centrifuge; high-speed visualization; polymeric particles
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Maeda, K.; Onoe, H.; Takinoue, M.; Takeuchi, S. Observation and Manipulation of a Capillary Jet in a Centrifuge-Based Droplet Shooting Device. Micromachines 2015, 6, 1526-1533.

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