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Proceedings Paper

Laser direct writing 3D structures for microfluidic channels: flow meter and mixer
Author(s): Chih-Lang Lin; Yi-Jui Liu; Zheng-Da Lin; Bo-Long Wu; Yi-Hsiung Lee; Chow-Shing Shin; Patrice L. Baldeck
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Paper Abstract

The 3D laser direct-writing technology is aimed at the modeling of arbitrary three-dimensional (3D) complex microstructures by scanning a laser-focusing point along predetermined trajectories. Through the perspective technique, the details of designed 3D structures can be properly fabricated in a microchannel. This study introduces a direct reading flow meter and a 3D passive mixer fabricated by laser direct writing for microfluidic applications. The flow meter consists of two rod-shaped springs, a pillar, an anchor, and a wedge-shaped indicator, installed inside a microfluidic channel. The indicator is deflected by the flowing fluid while restrained by the spring to establish an equilibrium indication according to the flow rate. The measurement is readily carried out by optical microscopy observation. The 3D passive Archimedes-screw-shaped mixer is designed to disturb the laminar flow 3D direction for enhancing the mixing efficiency. The simulation results indicate that the screw provides 3D disturbance of streamlines in the microchannel. The mixing demonstration for fluids flowing in the micrchannel approximately agrees with the simulation result. Thanks to the advantage of the laser direct writing technology, this study performs the ingenious applications of 3D structures for microchannels.

Paper Details

Date Published: 5 March 2015
PDF: 9 pages
Proc. SPIE 9320, Microfluidics, BioMEMS, and Medical Microsystems XIII, 93200H (5 March 2015); doi: 10.1117/12.2079547
Show Author Affiliations
Chih-Lang Lin, Central Taiwan Univ. of Science and Technology (Taiwan)
Yi-Jui Liu, Feng Chia Univ. (Taiwan)
Zheng-Da Lin, Feng Chia Univ. (Taiwan)
Bo-Long Wu, Feng Chia Univ. (Taiwan)
Yi-Hsiung Lee, Feng Chia Univ. (Taiwan)
Chow-Shing Shin, National Taiwan Univ. (Taiwan)
Patrice L. Baldeck, Univ. Grenoble 1, CNRS (France)

Published in SPIE Proceedings Vol. 9320:
Microfluidics, BioMEMS, and Medical Microsystems XIII
Bonnie L. Gray; Holger Becker, Editor(s)

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