期刊
MICROMACHINES
卷 6, 期 10, 页码 1445-1458出版社
MDPI
DOI: 10.3390/mi6101429
关键词
microchannel; microplasma; wettability
类别
资金
- EPSRC grant at Sheffield [EP/E01867X/1]
- Engineering and Physical Sciences Research Council [EP/I027858/1, EP/E01867X/1] Funding Source: researchfish
- EPSRC [EP/I027858/1, EP/E01867X/1] Funding Source: UKRI
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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