Unexpected beads alignment in a microfluidic channel

Chia-Hung Tsai, Manh Hao Phan, Koji Mizoue, Makoto Kaneko

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

A surprising phenomenon is observed in a microfluidic channel where suspending microbeads are spontaneously aligned into lines. Microbeads are randomly distributed in the channel at a relatively high velocity (3.27 mm/ms), but start to align into lines at a relatively low velocity (0.05 mm/ms). The alignment has been repeated with and without obstacles in the channel. The phenomenon is interpreted as an unintended acoustic wave being around the experimental environment, and the wave resulted in a standing wave which moves the microbeads towards the nodes of the standing wave. By using a frequency analyzer, it is found that a pulse-width-modulation controller in the system generated high-frequency signals, which is the most possible wave source for the alignment. The experimental results are presented, and characteristics of acoustic wave are analyzed. The phenomenon could contribute to microfluidic applications for achieving acoustic alignment without complex fabrication of interdigital transducers.

Original languageEnglish
Title of host publicationIROS 2016 - 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages5143-5148
Number of pages6
ISBN (Electronic)9781509037629
DOIs
StatePublished - 28 Nov 2016
Event2016 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2016 - Daejeon, Korea, Republic of
Duration: 9 Oct 201614 Oct 2016

Publication series

NameIEEE International Conference on Intelligent Robots and Systems
Volume2016-November
ISSN (Print)2153-0858
ISSN (Electronic)2153-0866

Conference

Conference2016 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2016
CountryKorea, Republic of
CityDaejeon
Period9/10/1614/10/16

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