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

Kazuya Koshio; Kazuhide Arai; Tomonori Waku; Peter W. Wilson; Yoshimichi Hagiwara

doi:10.1371/journal.pone.0204686

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

Journal article

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

Kazuya Koshio, Kazuhide Arai, Tomonori Waku, Peter W. Wilson and Yoshimichi Hagiwara

PloS one, Vol.13(10), e0204686

05/10/2018

DOI: https://doi.org/10.1371/journal.pone.0204686

PMCID: PMC6173376

PMID: 30289883

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Abstract

Multidisciplinary Sciences

Science & Technology

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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.

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Title: Suppression of droplets freezing on glass surfaces on which antifreeze polypeptides are adhered by a silane coupling agent
Creators: Kazuya Koshio - Kyoto Institute of Technology
Kazuhide Arai - Kyoto Institute of Technology
Tomonori Waku - Kyoto Institute of Technology
Peter W. Wilson - University of Tasmania
Yoshimichi Hagiwara - Kyoto Institute of Technology
Publication Details: PloS one, Vol.13(10), e0204686
Publisher: Public Library Science
Number of pages: 15
Grant note: 15H02220 / Japan Society for the Promotion of Science; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
Identifiers: 991013099081602368
Academic Unit: School of Environment, Science and Engineering
Language: English
Resource Type: Journal article

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

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