Layered liquid-liquid flow in microchannels having selectively modified hydrophilic and hydrophobic walls

Yoshikazu Yamasaki; Masato Goto; Akira Kariyasaki; Shigeharu Morooka; Yoshiko Yamaguchi; Masaya Miyazaki; Hideaki Maeda

Korean Journal of Chemical Engineering, Vol.26, No.6, 1759-1765, November, 2009

DOI10.1007/s11814-009-0265-9 Export Citation

Layered liquid-liquid flow in microchannels having selectively modified hydrophilic and hydrophobic walls

Yoshikazu Yamasaki¹, Masato Goto¹, Akira Kariyasaki¹, Shigeharu Morooka^{1, †}, Yoshiko Yamaguchi², Masaya Miyazaki^{2, 3}, and Hideaki Maeda^{2, 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

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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.

Keywords:Microchannel;Layered Flow;Wettability;Surface Modification;CFD Simulation

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[2] Hessel V, Hardt S, Lowe H, Chemical micro process engineering, fundamentals, modelling and reactors, Wiley-VCH Wiley-VCH, Weinheim, Germany (2003)

[3] Hessel V, Lowe H, Muller A, Kolb C, Chemical micro process engineering, processing and plants, Wiley-VCH, Weinheim, Germany (2004)

[4] Sotowa KI, Miyoshi R, Lee CG, Kang Y, Kusakabe K, Korean J. Chem. Eng., 22(4), 552 (2005)

[5] Kitamura N, Ueno K, Kim HB, Anal. Sic., 24, 701 (2008)

[6] Yoshida JI, FLASH CHEMISTRY, Fast organic synthesis in microsystems, Wiley, Chichester, UK (2008)

[7] Hessel V, Renken A, Shouten JC, Yoshida J (edts.), Micro process engineering, a comprehensive handbook, Wiley-VCH, Weinheim, Germany (2009)

[8] Dessimoz AL, Cavin L, Renken A, Kiwi-Minsker L, Chem. Eng. Sci., 63(16), 4035 (2008)

[9] Yamaguchi Y, Takagi F, Yamashita K, Nakamura H, Maeda H, Sotowa K, Kusakabe K, Yamasaki Y, Morooka S, AIChE J., 50(7), 1530 (2004)

[10] Yamaguchi Y, Honda T, Briones MP, Yamashita K, Miyazaki M, Nakamura H, Maeda H, Chem. Eng. Technol., 30(3), 379 (2007)

[11] Zhao B, Viernes NOL, Moore JS, Beebe DJ, J. Am. Chem. Soc., 124(19), 5284 (2002)

[12] Kim HB, Ueno K, Chiba M, Kogi O, Kitamura N, Anal. Sci., 16, 871 (2000)

[13] Hibara A, Tokeshi M, Uchiyama K, Hisamoto H, Kitamori T, Anal. Sci., 17, 89 (2001)

[14] Hibara A, Nonaka M, Hisamoto H, Uchiyama K, Kikutani Y, Tokeshi and T. Kitamori M, Anal. Chem., 74, 1724 (2002)

[15] Arata A, Hibara A, Kitamori T, Anal. Chem., 79, 3919 (2007)

[16] Kariyasaki A, Yamasaki Y, Kagawa M, Nagashima T, Ousaka A, Morooka S, Heat Transfer Eng., 30, 28 (2009)

[17] Yamasaki Y, Goto M, Kariyasaki A, Morooka S, Kagaku Kogaku Ronbunshu, 34, 175 (2008)