21 February 2013 Wetting in color: from photonic fingerprinting of liquids to optical control of liquid percolation
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Abstract
We provide an overview of our recent advances in the manipulation of wetting in inverse-opal photonic crystals. Exploiting photonic crystals with spatially patterned surface chemistry to confine the infiltration of fluids to liquidspecific spatial patterns, we developed a highly selective scheme for colorimetry, where organic liquids are distinguished based on wetting. The high selectivity of wetting, upon-which the sensitivity of the response relies, and the bright iridescent color, which disappears when the pores are filled with liquid, are both a result of the highly symmetric pore structure of our inverse-opal films. The application of horizontally or vertically orientated gradients in the surface chemistry allows a unique response to be tailored to specific liquids. While the generic nature of wetting makes our approach to colorimetry suitable for applications in liquid authentication or identification across a broad range of industries, it also ensures chemical non-specificity. However, we show that chemical specificity can be achieved combinatorially using an array of indicators that each exploits different chemical gradients to cover the same dynamic range of response. Finally, incorporating a photo-responsive polyelectrolyte surface layer into the pores, we are able to dynamically and continuously photo-tune the wetting response, even while the film is immersed in liquid. This in situ optical control of liquid percolation in our photonic-crystal films may also provide an error-free means to tailor indicator response, naturally compensating for batch-to-batch variability in the pore geometry.
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Ian B. Burgess, Bryan A. Nerger, Kevin P. Raymond, Alexis Goulet-Hanssens, Thomas A. Singleton, Mackenzie H. Kinney, Anna V. Shneidman, Natalie Koay, Christopher J. Barrett, Marko Lončar, Joanna Aizenberg, "Wetting in color: from photonic fingerprinting of liquids to optical control of liquid percolation", Proc. SPIE 8632, Photonic and Phononic Properties of Engineered Nanostructures III, 863201 (21 February 2013); doi: 10.1117/12.2013366; https://doi.org/10.1117/12.2013366
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