Hydrophilic Surface Modification of PDMS Microchannel for O-W and W-O-W EmulsionsReport as inadecuate




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1

School of Mathematics and Statistics, Hicks Building, University of Sheffield, Sheffield S3 7RH, UK

2

Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan

3

Department of Physics, COMSATS Institute of Information Technology, Islamabad 45650, Pakistan

4

Department of Chemistry and Applied Biosciences, Institute of Chemical and Bioengineering, ETH Zurich, Ramistrasse 101, 8092 Zurich, Switzerland

5

Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, UK



These authors contributed equally to this work.





*

Author to whom correspondence should be addressed.



Academic Editor: Fan-Gang Tseng

Abstract 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





Author: Shazia Bashir 1,2,†,* , Muhammad Bashir 3,†, Xavier Casadevall i Solvas 4, Julia M. Rees 1 and William B. Zimmerman 5

Source: http://mdpi.com/



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