Investigating the Ice-Water Interface: Two Light - Experiments

The results of two light-scattering experiments are reported. (1) Enhanced light-scattering was observed at the interface between a growing ice crystal and its melt. This phenomenon was investigated by photon correlation spectroscopy. The scattered intensity vs. crystal growth rate hysteresis loop previously reported was not confirmed. A growth rate dependence for the time to onset of enhanced light-scattering was observed. (2) Antifreeze glycoproteins anomalously lower the freezing point of a water solution. It has been suggested that these glycoproteins adsorb into the surface of an ice crystal immersed in a glycoprotein solution. Such a surface was probed by surface second -harmonic generation. The results provide direct evidence for the adsorption model.