Janus regulation of ice growth by hyperbranched polyglycerols generating dynamic hydrogen bonding

Sang Yup Lee, Minseong Kim, Tae Kyung Won, Seung Hyuk Back, Youngjoo Hong, Byeong-Su Kim () and Dong June Ahn ()
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Sang Yup Lee: Korea University
Minseong Kim: Yonsei University
Tae Kyung Won: Korea University
Seung Hyuk Back: Korea University
Youngjoo Hong: Yonsei University
Byeong-Su Kim: Yonsei University
Dong June Ahn: Korea University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract In this study, a new phenomenon describing the Janus effect on ice growth by hyperbranched polyglycerols, which can align the surrounding water molecules, has been identified. Even with an identical polyglycerol, we not only induced to inhibit ice growth and recrystallization, but also to promote the growth rate of ice that is more than twice that of pure water. By investigating the polymer architecture and population, we found that the stark difference in the generation of quasi-structured H2O molecules at the ice/water interface played a crucial role in the outcome of these opposite effects. Inhibition activity was induced when polymers at nearly fixed loci formed steady hydrogen bonding with the ice surface. However, the formation-and-dissociation dynamics of the interfacial hydrogen bonds, originating from and maintained by migrating polymers, resulted in an enhanced quasi-liquid layer that facilitated ice growth. Such ice growth activity is a unique property unseen in natural antifreeze proteins or their mimetic materials.

Date: 2022
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DOI: 10.1038/s41467-022-34300-x

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