Observation and Manipulation of a Capillary Jet in a Centrifuge-Based Droplet Shooting Device
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.
Additional Information
© 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). 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) We thank Yukiko T. Matsunaga for support in the experimental measurements. This work was partially supported by a Grant-in-Aid for Challenging Exploratory Research (Project No. 24651159) and a Grant-in-Aid for Scientific Research (S) (Project No. 22220001) from the Japan Society for the Promotion of Science (JSPS), Japan. Author Contributions: K.M developed the concept of the paper. K.M and H.O designed the experimental setup. K.M collected and analyzed the experimental data. K.M wrote the manuscript with inputs from H.O, M.T and S.T. S.T supervised the overall coordination. All authors contributed to the manuscript and the interpretation of the data. The authors declare no conflict of interest.Attached Files
Published - micromachines-06-01436-v2.pdf
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Additional details
- Eprint ID
- 92522
- Resolver ID
- CaltechAUTHORS:20190130-121936480
- 24651159
- Japan Society for the Promotion of Science (JSPS)
- 22220001
- Japan Society for the Promotion of Science (JSPS)
- Created
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2019-01-31Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field