title: Combinatorial wetting in colour: an optofluidic nose.
abstract: We present a colourimetric litmus test for simple differentiation of organic liquids based on wetting, which achieves chemical specificity without a significant sacrifice in portability or ease-of-use. Chemical specificity is derived from the combination of colourimetric wetting patterns produced by liquids in an array of inverse opal films, each having a graded wettability, but using different surface groups to define that gradient.
authors: University of Waterloo, Waterloo, ON, Canada.
authors: Kevin P
authors: KP
authors: Raymond
authors: Ian B
authors: IB
authors: Burgess
authors: Mackenzie H
authors: MH
authors: Kinney
authors: Marko
authors: M
authors: Lončar
authors: Joanna
authors: J
authors: Aizenberg
mesh_terms: D003116:Color; D003124:Colorimetry; D000431:Ethanol / Q000737:chemistry; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods; D055095:Optics and Photonics / Q000295:instrumentation*; D025341:Principal Component Analysis; D017155:Wettability; D014992:Xylenes / Q000737:chemistry
chemical_list: D014992:Xylenes; D000431:Ethanol; C026114:2-xylene