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Suppression of droplets freezing on glass surfaces on which antifreeze polypeptides are adhered by a silane coupling agent

Citation

Koshio, K and Arai, K and Waku, T and Wilson, PW and Hagiwara, Y, Suppression of droplets freezing on glass surfaces on which antifreeze polypeptides are adhered by a silane coupling agent, PLoS ONE, 13, (10) Article e0204686. ISSN 1932-6203 (2018) [Refereed Article]


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Copyright Statement

Copyright 2018 Koshio et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1371/journal.pone.0204686

Abstract

The development of ice-phobic, glass-substrate surfaces is important for many reasons such as poor visibility through the ice-covered windshields of vehicles. The present authors have developed new glass surfaces coated with a silane coupling agent and polypeptides whose amino-Acid sequence is identical to a partial sequence of winter flounder antifreeze protein. We have conducted experiments on the freezing of sessile water droplets on the glass surfaces, and measured the droplet temperature, contact angle, contact area and surface roughness. The results show that the supercooling temperature decreased noticeably in the case where a higher concentration solution of polypeptide was used for the coating. The adhesion strength of frozen droplets was lowest in the same case. In addition, we observed many nanoscale humps on the coated surface, which were formed by polypeptide aggregates in the solution. We argue that the combination of the hydrophilic humps and the hydrophobic base surfaces causes water molecules adjacent to the surfaces to have a variety of orientations in that plane, even after the ice layer started to grow. This then induces a misfit of water-molecule spacing in the ice layers and consequent formation of fragile polycrystalline structure. This explains the lower values of ice adhesion strength and supercooling enhancement in the cases of the polypeptide-coated glass plates.

Item Details

Item Type:Refereed Article
Keywords:ice, antifreeze, ice-phobic surface
Research Division:Chemical Sciences
Research Group:Macromolecular and Materials Chemistry
Research Field:Physical Chemistry of Materials
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Technology
UTAS Author:Wilson, PW (Professor Peter Wilson)
ID Code:131920
Year Published:2018
Web of Science® Times Cited:1
Deposited By:Oceans and Cryosphere
Deposited On:2019-04-11
Last Modified:2019-05-01
Downloads:8 View Download Statistics

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