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Transient Phase of Ice Observed by Sum Frequency Generation at the Water/Mineral Interface During Freezing

TitleTransient Phase of Ice Observed by Sum Frequency Generation at the Water/Mineral Interface During Freezing
Publication TypeJournal Article
Year of Publication2017
AuthorsLovering, KA, Bertram, AK, Chou, KC
JournalJOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume8
Pagination871-875
Date PublishedFEB 16
ISSN1948-7185
Abstract

We observed a transient noncentrosymmetric phase of ice at water/mineral interfaces during freezing, which enhanced the intensity of the IR-visible sum frequency generation intensity by up to 20-fold. The lifetime of the transient phase was several minutes. Since the most stable form of ice, hexagonal and cubic ice, are centrosymmetric, our study suggests the transient existence of stacking-disordered ice during the freezing process I water/mineral interfaces. Stacking-disordered ice, which has only been observed in bulk ice at temperatures lower than -20 degrees C, is a random mixture of layers of hexagonal ice and cubic ice. However, the transient phase at the ice/mineral interface was observed at temperatures as high as -1 degrees C. It suggests that the mineral surface may play a role in promoting and stabilizing the formation of stacking-disordered ice at the interface.

DOI10.1021/acs.jpclett.6b02920