title: Rates of homogeneous ice nucleation in levitated H2O and D2O droplets.
abstract: Rates of homogeneous nucleation of H2O droplets in a temperature range from 236.37 to 237.91 K and of D2O droplets from 241.34 to 242.33 K were measured. The single microdroplets consisted of pure H2O or D2O and were levitated in an electrodynamic balance. In comparison to H2O, D2O shows a stronger tendency to nucleate. Over the investigated temperature interval, D2O droplets need to be supercooled less by 1.1 K compared to H2O droplets in order to arrive at the same nucleation rate. This is in good agreement with the higher degree of intermolecular association in liquid D2O, a fact which has been well established previously both from theory and experimental studies.
authors.affiliation: Boehringer Ingelheim Pharma GmbH & Co. KG, Binger Str. 173, 55216 Ingelheim am Rhein, Germany. peter.stockel@web.de
authors.forename: Peter
authors.initials: P
authors.lastname: Stöckel
authors.forename: Inez M
authors.initials: IM
authors.lastname: Weidinger
authors.forename: Helmut
authors.initials: H
authors.lastname: Baumgärtel
authors.forename: Thomas
authors.initials: T
authors.lastname: Leisner
mesh_terms: D003080:Cold Temperature; D017666:Deuterium Oxide / Q000737:chemistry*; D005615:Freezing; D007053:Ice; D014867:Water / Q000737:chemistry*
chemical_list: D007053:Ice; D014867:Water; D017666:Deuterium Oxide