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Open AccessArticle

Hydrophilic Surface Modification of PDMS Microchannel for O/W and W/O/W Emulsions

1
School of Mathematics and Statistics, Hicks Building, University of Sheffield, Sheffield S3 7RH, UK
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Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan
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Department of Physics, COMSATS Institute of Information Technology, Islamabad 45650, Pakistan
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Department of Chemistry and Applied Biosciences, Institute of Chemical and Bioengineering, ETH Zurich, Ramistrasse 101, 8092 Zurich, Switzerland
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Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, UK
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Fan-Gang Tseng
Micromachines 2015, 6(10), 1445-1458; https://doi.org/10.3390/mi6101429
Received: 21 August 2015 / Revised: 11 September 2015 / Accepted: 16 September 2015 / Published: 29 September 2015
(This article belongs to the Special Issue Droplet Microfluidics: Techniques and Technologies)
A surface modification method for bonded polydimethylsiloxane (PDMS) microchannels is presented herein. Polymerization of acrylic acid was performed on the surface of a microchannel using an inline atmospheric pressure dielectric barrier microplasma technique. The surface treatment changes the wettability of the microchannel from hydrophobic to hydrophilic. This is a challenging task due to the fast hydrophobic recovery of the PDMS surface after modification. This modification allows the formation of highly monodisperse oil-in-water (O/W) droplets. The generation of water-in-oil-in-water (W/O/W) double emulsions was successfully achieved by connecting in series a hydrophobic microchip with a modified hydrophilic microchip. An original channel blocking technique to pattern the surface wettability of a specific section of a microchip using a viscous liquid comprising a mixture of honey and glycerol, is also presented for generating W/O/W emulsions on a single chip. View Full-Text
Keywords: microchannel; microplasma; wettability microchannel; microplasma; wettability
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Bashir, S.; Bashir, M.; Solvas, X.C.; Rees, J.M.; Zimmerman, W.B. Hydrophilic Surface Modification of PDMS Microchannel for O/W and W/O/W Emulsions. Micromachines 2015, 6, 1445-1458.

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