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Received March 26, 2009
Accepted April 28, 2009
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Layered liquid-liquid flow in microchannels having selectively modified hydrophilic and hydrophobic walls
Yoshikazu Yamasaki1
Masato Goto1
Akira Kariyasaki1
Shigeharu Morooka1†
Yoshiko Yamaguchi2
Masaya Miyazaki2 3
Hideaki Maeda2 3
1Department of Chemical Engineering, Fukuoka University, Fukuoka 814-0180, Japan 2Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tosu 841-0052, Japan 3Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
smorooka@fukuoka-u.ac.jp
Korean Journal of Chemical Engineering, November 2009, 26(6), 1759-1765(7), 10.1007/s11814-009-0265-9
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Abstract
When two immiscible liquids make contact in a microchannel, the flow pattern is affected by the affinity between channel walls and liquids. In this study, microchannels (200 μm in width and 200 μm in depth) having a Tshaped bifurcation point were fabricated on PMMA plates. The inner walls of the microchannels were modified in a zone-selective manner to be either hydrophilic or hydrophobic, based on verification accomplished via a laser interference fringe technique. The microchannel was placed horizontally, and water and octane were introduced into the upper-side channel (hydrophilic) and into the lower-side channel (hydrophobic), respectively. The experimental results showed that water and octane formed a stable layered flow, and the two liquids were virtually completely separated at the T-shaped section, even when static pressure was intentionally applied to the outlets. CFD simulation, using FLUENT 6.3 software, was performed to explain the role of zone-selective modification of microchannel walls.
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