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Defect-induced wetting on BaF2(111) and CaF2(111) at ambient conditions

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Volume
605
Identifiers
DOI: 10.1016/j.susc.2011.07.003
Keywords
  • Wetting
  • Water-Surface Interactions
  • Scanning Force Microscopy
  • Baf2(111)
  • Caf2(111)

Abstract

Abstract The interaction of water with freshly cleaved (111) surfaces of isostructural BaF2 and CaF2 single crystals at ambient conditions (room temperature and under controlled humidity) has been studied using scanning force microscopy in different operation modes and optical microscopy. Such surfaces exhibit contrasting behaviors for both materials: while on BaF2(111) two-dimensional water layers are formed after accumulation at step edges, CaF2(111) does not promote the formation of such layers. We attribute such opposed behavior to lattice match (mismatch) between hexagonal water ice and the hexagonal (111) surfaces of BaF2(CaF2). Optical microscope images reveal that this behavior also determines the way the surfaces become wetted at a macroscopic level.

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