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Issue 73, 2017
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Marker patterning: a spatially resolved method for tuning the wettability of PDMS

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Abstract

Versatile, inexpensive and easy to use, PDMS has become a very common material, especially in the field of microfluidics. Intrinsically hydrophobic, it can be made hydrophilic by exposure to oxygen plasma. For some applications, wettability patterning of the PDMS surface is needed, in particular for the formation of monodisperse multiple emulsions. In this work we present an easy and spatially resolved way to tune the wettability of PDMS. Patterning is achieved without tedious or complicated surface processing by simply drawing the desired pattern onto the PDMS surface using the permanent ink of a marker as a masking layer. The microfluidic device is then exposed to oxygen plasma prior to bonding and flushed with ethanol when bonded. The parts of PDMS which are protected remained hydrophobic whereas unprotected surfaces are oxidized. The process is demonstrated by forming W/O/W emulsions in a controlled manner.

Graphical abstract: Marker patterning: a spatially resolved method for tuning the wettability of PDMS

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Publication details

The article was received on 19 May 2017, accepted on 25 Sep 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7RA05654K
RSC Adv., 2017,7, 46514-46519
  • Open access: Creative Commons BY license
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    Marker patterning: a spatially resolved method for tuning the wettability of PDMS

    N. Bodin-Thomazo, F. Malloggi and P. Guenoun, RSC Adv., 2017, 7, 46514
    DOI: 10.1039/C7RA05654K

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