Abstract

Diversity in structures of water endowed by a hydrogen-bonding network plays crucial roles in wide varieties of phenomena in nature. Chiral ordering of water molecules is an intriguing phenomenon from the viewpoint of bimolecular functions. However, experimental reports on chiral ordering have been limited to the water molecules interacting with biomolecules on the molecular scale. It remains unclear whether pure liquid water forms long-range chiral ordering without any interaction with biomolecules. Here, we show that chiral anisotropy can be observed in the macro/mesoscopic network pattern of an unknown water layer formed via spinodal phase separation-like dynamics at the interface between water and ice III with a chiral crystal structure. We named this unknown water homoimmiscible water. Our observations infer that the unknown water is a chiral liquid crystal. This possibility opens new avenues for a wide variety of research fields such as liquid polymorphism, biology, earth and planetary science, and so forth from the perspective of chirality.

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