Janus Effect on Ice Growth by Hyperbranched Polyglycerols Generating Dynamic Hydrogen Bonding
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Water freezing is a commonly observed natural phenomenon; however, ice growth and recrystallization can critically damage living organisms. To survive this freezing threat, nature has evolved to produce antifreeze proteins (AFPs) with specific amino acid sequences that induce the Kelvin effect. On the contrary, ice-binding surfaces can also lead to heterogeneous ice nucleation when the appropriate chemical and dimensional aspects are satisfied. 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. To analyses the control of ice growth and recrystallization, phenomena were observed with the 1-directional freezing and the splat method, through molecular simulation, we found that the behavior at the water/ice interface varies depending on the concentration of the polymer.