Abstract
Previously we and others have shown terahertz sensitivity to protein-ligand binding, possibly arising from the change in low frequency structural modes [1]. Another possibility is that the water adjacent to the protein, which strongly contributes to the THz response, may be affected by the change in the protein surface with binding. Pollack and coworkers have shown an ordered water film (from nm up to hundreds of um thickness) is formed on a smooth hydrophilic surface [2, 3]. To study how picosecond dynamics of water are affected by hydrophilicity of a surface, we performed a series of terahertz dielectric measurements as a function of water film thickness and hydrophicility of the surface.
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