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Journal of Sensors
Volume 2013, Article ID 436492, 6 pages
Research Article

Integrated Channel Selector for Directing Fluid Flow Using Thermoreversible Gelation Controlled by a Digital Mirror Device

1Reserch Center for Allergy and Immunology, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
2Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Ohkubo, Tokyo 169-8555, Japan
3Laboratory of Bioanalytical Chemistry, Tokyo University, 7-3-1 Hongo, Tokyo 113-0033, Japan

Received 6 October 2012; Revised 11 February 2013; Accepted 19 February 2013

Academic Editor: Takahiro Arakawa

Copyright © 2013 Yoshitaka Shirasaki et al. 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.


An integrated channel selector system employing thermoreversible gelation of a polymer was developed. Here, we show a system with arrayed microchannels having nine crossing points. Infrared laser irradiation was used to form gel areas at several crossing points in arranging a flow path from the inlet to one of the nine outlets passing through certain junctions and channels. The multipoint irradiation by the infrared laser was realized using a personal-computer-controlled digital mirror device. The system was demonstrated to be able to direct flow to all nine outlets. Finally, we achieved to produce flexible paths for flowing particles including side trips.