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Coatings 2015, 5(4), 724-736; doi:10.3390/coatings5040724

Reversible Switching of Icing Properties on Pyroelectric Polyvenylidene Fluoride Thin Film Coatings

Institute of Materials Science, Technische Universität Dresden, Helmholtzstr. 7, Dresden 01069, Germany
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Academic Editor: D. K. Sarkar
Received: 28 August 2015 / Revised: 18 September 2015 / Accepted: 14 October 2015 / Published: 20 October 2015
(This article belongs to the Special Issue Anti-Icing Coatings and Surfaces)
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Abstract

In this work a new approach for ice repellent coatings is presented. It was shown that the coatings cause a decrease or increase in the freezing temperature of water depending on the alignment of an external electric field. For this coating the commonly used pyroelectric polymer polyvenylidene fluoride was deposited as a thin film on glass. The samples were dip-coated and subsequently thermally-treated at 140 °C for 1 h. All samples were found to cause a reduction of the icing temperature of water on their surface in comparison to uncoated glass. On several samples an external electric field was applied during this thermal treatment. The field application was found to cause a remarkable reduction of the icing temperature where a maximum lowering of the freezing temperature of 3 K compared to uncoated glass could be achieved. The actual achieved reduction of the icing temperature was observed to depend on the polarity of the field applied during the thermal treatment. Furthermore, a repetition of the thermal treatment under oppositely directed electric fields led to a switchable freezing behavior of water according to the direction of the applied field. With an increasing number of cycles of switching of the icing property a slight training effect towards lower freezing temperatures was observed. View Full-Text
Keywords: anti-icing; coatings; defrost; electric field; freezing; ice adhesion; icephobic surfaces; pyroelectric; super-hydrophobicity; roughness anti-icing; coatings; defrost; electric field; freezing; ice adhesion; icephobic surfaces; pyroelectric; super-hydrophobicity; roughness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Spitzner, D.; Bergmann, U.; Apelt, S.; Boucher, R.A.; Wiesmann, H.-P. Reversible Switching of Icing Properties on Pyroelectric Polyvenylidene Fluoride Thin Film Coatings. Coatings 2015, 5, 724-736.

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