Langmuir Films of Amphiphilic Alcohols and Surfaces of Polar Crystals as Templates for ice Nucleation
Two approaches are used to study suggested mechanisms for heterogeneous ice nucleation. In one, an epitaxial-like mechanism is studied by using Langmuir monolayers of aliphatic alcohols C n H 2n +1OH (n=16 to 31) spread on supercooled water drops. The packing arrangement of several of these uncompressed.monolayers on water, have been determined by grazing incidence x-ray diffraction (GID) and correlated with the structure of water molecules at the (001) face of hexagonal ice. The roles played by lattice match between the monolayers and ice, the coherence length of the amphiphile crystallites and the orientation of the hydroxyl groups at the interface in determining the nucleation efficiencies are specifically addressed. In another induced nucleation of ice by an electric field is studied using hydrophobic surfaces of chiral resolved and racemic α-amino acid crystals onto which water vapor has been condensed and nucleated into ice.
KeywordsAliphatic Alcohol Lattice Match Langmuir Monolayer Polar Crystal Chiral Crystal
Unable to display preview. Download preview PDF.
- (1).This work has been presented in the same format at the Nato Research Workshop on Hydrogen Bond Networks, Cargese, 1993. An extended version of this work will be presented in a review article in Organic Thin Films and Surfaces, Vol.I edited by A. Ulman.Google Scholar
- (7).Gavish, M.; Wang, J.-L.; Eisenstein, M.; Lahav, M.; L.Leiserowitz Science 1992,Google Scholar
- (12).Popovitz-Biro, R.; Wang, J. L.; Majewski, J.; Shavit, E.; Leiserowitz, L.; Lahav, M. J.Am.Chem.Soc. 1993, accepted for publication.Google Scholar
- (13).Wang, J. L.; Levellier, F.; Jacquemain, D.; Kjaer, K.; Als-Nielsen, J.; Lahav, M.; Leiserowitz, L. J.Am.Chem.Soc. 1993, accepted for publication.Google Scholar
- (14).Small, D. M. In Handbook of Lipid Research Plenum Press: 1986; Vol. 4, chapters: 2, 5, 8.Google Scholar
- (18).a) Wilen, L. Science 1993, 259, 1469.; (b) Lahav, M.; Eisenstein, M.; Leiserowitz, L.ibid 1993, 259, 1469.Google Scholar