25 September 1995 Second harmonic generation studies of the ice/water interface
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Abstract
Understanding the structure of the interface between ice and liquid water is essential to the study of molecular adsorption at this boundary. Despite great interest in the ice/water interface, experimental studies are sparse. In this work, the nonlinear optical laser technique, second harmonic generation (SHG), is used in a total internal reflection geometry to probe the single crystalline ice/water interface. SHG signals from the clean ice/water interface are observed and attributed to symmetry breaking at the boundary. We report observation of a linear adsorption isotherm when water is replaced by 0.2 to 7 (mu) M solutions of 2,2'- dihydroxy-1,1'-binaphthyl (BN). The coverage is most likely submonolayer; therefore, we observe only the beginning of the adsorption profile. We argue that BN adsorption is entropy driven. In a separate study, 0.02 to 1 mg/mL solutions of winter flounder antifreeze protein are contacted with the ice. The adsorption profile closely follows the freezing point depression activity curve of the protein.
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Cynthia M. Bouchez, Janice M. Hicks, "Second harmonic generation studies of the ice/water interface", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); doi: 10.1117/12.221471; https://doi.org/10.1117/12.221471
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