Hydrophilic surface modification of PDMS microchannel for O/W and W/O/W emulsions
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Date
2015
Publication Type
Journal Article
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yes
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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.
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published
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Journal / series
Volume
6 (10)
Pages / Article No.
1445 - 1458
Publisher
MDPI
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Methods
Software
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Subject
microchannel; Microplasma; wettability