Tahei Tahara

TL;DR: The obtained chi(2) spectra clearly showed flip-flop of the interfacial water molecules which is induced by the opposite charge of the head group of the surfactants.

TL;DR: The present status of experiments and applications of multiplex HD-VSFG spectroscopy are described, in particular with regard to the orientation and structure of interfacial water at charged, neutral, and biorelevant water interfaces.

TL;DR: The present study indicates that there is no ice-like structure at the surface, but that there are water pairs interacting with a strong hydrogen bond at the outermost surface, and confirms that the major source of the isotope effect on the water χ((2)) spectra is the intramolecular anharmonic coupling, i.e., Fermi resonance.

TL;DR: The water structure at a zwitterionic lipid, phosphatidylcholine, monolayer/water interface is investigated using heterodyne-detected vibrational sum frequency generation spectroscopy and it is demonstrated that, when the positive and negative charges coexist at the interface, the H-down-oriented water structure and H-up- oriented water structure appear in the vicinity of the respective charged sites.

TL;DR: The heterodyne-detected vibrational sum frequency generation (HD-VSFG) studies of lipid monolayer/water interfaces are reported, which show that interfacial water has comparable hydrogen bond strength, and it is analogous to the bulk water.