title: Topography printing to locally control wettability.
abstract: This paper reports a new patterning method, which utilizes NaOH to facilitate the irreversible binding between the PDMS stamp and substrates and subsequent cohesive mechanical failure to transfer the PDMS patterns. Our method shows high substrate tolerance and can be used to "print" various PDMS geometries on a wide range of surfaces, including Si100, glass, gold, polymers, and patterned SU8 photoresist. Using this technique, we are able to locally change the wettability of substrate surfaces by printing well-defined PDMS architectures on the patterned SU8 photoresist. It is possible to generate differential wetting and dewetting properties in microchannels and in the PDMS printed area, respectively.
authors.affiliation: Melville Laboratory for Polymer Synthesis, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
authors.forename: Zijian
authors.initials: Z
authors.lastname: Zheng
authors.forename: Omar
authors.initials: O
authors.lastname: Azzaroni
authors.forename: Feng
authors.initials: F
authors.lastname: Zhou
authors.forename: Wilhelm T S
authors.initials: WT
authors.lastname: Huck
mesh_terms: D000327:Adsorption; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D008422:Materials Testing; D008853:Microscopy; D010777:Photochemistry; D012828:Silicones / Q000737:chemistry; D013499:Surface Properties; D017155:Wettability
chemical_list: D020099:Coated Materials, Biocompatible; D004129:Dimethylpolysiloxanes; D012828:Silicones