Water freezes differently on positively and negatively charged surfaces of pyroelectric materials

David Ehre, Etay Lavert, Meir Lahav, Igor Lubomirsky

Research output: Contribution to journalArticlepeer-review

153 Citations (Scopus)

Abstract

Although ice melts and water freezes under equilibrium conditions at 0°C, water can be supercooled under homogeneous conditions in a clean environment down to -40°C without freezing. The influence of the electric field on the freezing temperature of supercooled water (electrofreezing) is of topical importance in the living and inanimate worlds. We report that positively charged surfaces of pyroelectric LiTaO3 crystals and SrTiO 3 thin films promote ice nucleation, whereas the same surfaces when negatively charged reduce the freezing temperature. Accordingly, droplets of water cooled down on a negatively charged LiTaO3 surface and remaining liquid at -11°C freeze immediately when this surface is heated to -8°C, as a result of the replacement of the negative surface charge by a positive one. Furthermore, powder x-ray diffraction studies demonstrated that the freezing on the positively charged surface starts at the solid/water interface, whereas on a negatively charged surface, ice nucleation starts at the air/water interface.

Original languageEnglish
Pages (from-to)672-675
Number of pages4
JournalScience
Volume327
Issue number5966
DOIs
Publication statusPublished - Feb 5 2010

ASJC Scopus subject areas

  • General

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