Fast crystal growth of ice VII owing to the decoupling of translational and rotational ordering

Abstract

Despite the abundance of water’s crystalline polymorphs, the growth mechanisms of most ice forms remain poorly understood. This study applies extensive molecular dynamics (MD) simulations to examine the growth of ice VII, revealing a fast growth rate comparable to pure metals while maintaining robust hydrogen-bond networks. The results from an unsupervised machine learning applied to identify local structure suggest that the surface of ice VII consistently exhibits a body-centered cubic (bcc) plastic ice layer, indicating the decoupling of translational and rotational orderings. The study also uncovers the ultrafast growth rate of pure plastic ice, indicating that orientational disorder in the crystal structure may be associated with faster kinetics. Additionally, we discuss the impacts of interfacial plastic layer width and surface roughness on growth mode.

Chiral Spinodal-like Ordering of Homoimmiscible Water at Interface between Water and Chiral Ice III

“…Moreover, if the homoimmiscible water inherits the chirality in the crystal structure of ice III, it is highly possible that the liquid-crystal-like homoimmiscible water has chirality. It should be mentioned as a similar situation with our observation that a molecular dynamics simulation combined with unsupervised machine learning has uncovered the formation of an intermediate plastic ice layer at the interface between water and growing ice VII . Although it is still unclear whether the formation of the intermediate state predicted by the simulation has relationships with the formation of liquid crystalline-like homoimmiscible water shown by our observations, this relationship should be explored.…”