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Issue 45, 2019
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Wettability patterning in microfluidic devices using thermally-enhanced hydrophobic recovery of PDMS

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Abstract

Spatial control of wettability is key to many applications of microfluidic devices, ranging from double emulsion generation to localized cell adhesion. A number of techniques, often based on masking, have been developed to produce spatially-resolved wettability patterns at the surface of poly(dimethylsiloxane) (PDMS) elastomers. A major impediment they face is the natural hydrophobic recovery of PDMS: hydrophilized PDMS surfaces tend to return to hydrophobicity with time, mainly because of diffusion of low molecular weight silicone species to the surface. Instead of trying to avoid this phenomenon, we propose in this work to take advantage of hydrophobic recovery to modulate spatially the surface wettability of PDMS. Because temperature speeds up the rate of hydrophobic recovery, we show that space-resolved hydrophobic patterns can be produced by locally heating a plasma-hydrophilized PDMS surface with microresistors. Importantly, local wettability is quantified in microchannels using a fluorescent probe. This “thermo-patterning” technique provides a simple route to in situ wettability patterning in closed PDMS chips, without requiring further surface chemistry.

Graphical abstract: Wettability patterning in microfluidic devices using thermally-enhanced hydrophobic recovery of PDMS

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Publication details

The article was received on 04 Sep 2019, accepted on 21 Oct 2019 and first published on 22 Oct 2019


Article type: Paper
DOI: 10.1039/C9SM01792E
Soft Matter, 2019,15, 9253-9260

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    Wettability patterning in microfluidic devices using thermally-enhanced hydrophobic recovery of PDMS

    M. Pascual, M. Kerdraon, Q. Rezard, M. Jullien and L. Champougny, Soft Matter, 2019, 15, 9253
    DOI: 10.1039/C9SM01792E

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