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Micromachines 2015, 6(5), 622-633; doi:10.3390/mi6050622

Formation of Polymeric Hollow Microcapsules and Microlenses Using Gas-in-Organic-in-Water Droplets

1
Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
2
Department of Biomedical Devices and Instrumentation, Tokyo Medical and Dental University, 2-3-10, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
3
School of Mechanical Engineering, Pusan National University, Busan 609-735, Korea
4
Institute for Nanoscience and Nanotechnology, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Andrew deMello and Xavier Casadevall i Solvas
Received: 24 April 2015 / Revised: 18 May 2015 / Accepted: 19 May 2015 / Published: 21 May 2015
(This article belongs to the Special Issue Droplet Microfluidics: Techniques and Technologies)
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Abstract

This paper presents methods for the formation of hollow microcapsules and microlenses using multiphase microdroplets. Microdroplets, which consist of a gas core and an organic phase shell, were generated at a single junction on a silicon device without surface treatment of the fluidic channels. Droplet, core and shell dimensions were controlled by varying the flow rates of each phase. When the organic solvent was released from the organic phase shell, the environmental conditions changed the shape of the solidified polymer shell to either a hollow capsule or a microlens. A uniform solvent release process produced polymeric capsules with nanoliter gas core volumes and a membrane thickness of approximately 3 μm. Alternatively physical rearrangement of the core and shell allowed for the formation of polymeric microlenses. On-demand formation of the polymer lenses in wells and through-holes polydimethylsiloxane (PDMS) structures was achieved. Optical properties of the lenses were controlled by changing the dimension of these structures. View Full-Text
Keywords: multiphase microdroplet; hollow microcapsule; microlens multiphase microdroplet; hollow microcapsule; microlens
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

Yoon, D.H.; Hasegawa, K.; Kaneko, Y.; Arakawa, T.; Go, J.S.; Sekiguchi, T.; Shoji, S. Formation of Polymeric Hollow Microcapsules and Microlenses Using Gas-in-Organic-in-Water Droplets. Micromachines 2015, 6, 622-633.

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