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A Thermochromic Superhydrophobic Surface. | LitMetric

A Thermochromic Superhydrophobic Surface.

Sci Rep

Smart Materials, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

Published: June 2016

AI Article Synopsis

Article Abstract

Highly enhanced solid-state thermochromism is observed in regioregular poly(3-hexylthiophene), P3HT, when deposited on a superhydrophobic polymer-SiO2 nanocomposite coating. The conformal P3HT coating on the nanocomposite surface does not alter or reduce superhydrophicity while maintaining its reversible enhanced thermochromism. The polymeric matrix of the superhydrophobic surface is comprised of a blend of poly(vinylidene fluoride-co-hexafluoropropylene) copolymer and an acrylic adhesive. Based on detailed X-ray diffraction measurements, this long-lasting, repeatable and hysteresis-free thermochromic effect is attributed to the enhancement of the Bragg peak associated with the d-spacing of interchain directional packing (100) which remains unaltered during several heating-cooling cycles. We propose that the superhydrophobic surface confines π-π interchain stacking in P3HT with uniform d-spacing into its nanostructured texture resulting in better packing and reduction in face-on orientation. The rapid response of the system to sudden temperature changes is also demonstrated by water droplet impact and bounce back on heated surfaces. This effect can be exploited for embedded thin film temperature sensors for metal coatings.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4908389PMC
http://dx.doi.org/10.1038/srep27984DOI Listing

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