Nonlinear Spectroscopu of Nanoparticle/Aqueous Interface
Abstract
In the period of this project there have been significant advances in the development and application of second harmonic and sum frequency generation to the investigation of equilibrium and time dependent processes at aqueous interfaces. A powerful way to determine the dynamics of molecular motion of both interfacial solvent and adsorbed solute molecules,which is of major importance in interfacial chemistry, e.g.electronn transfer, has been achieved using both SFG and SHG. The first demonstration experiments in which molecules are pumped into excited electronic states and probed with femtosecond SFG has been accomplished. With these methods the rise and decay of short lived chemical species were detected. The effects of charged surfactants, high concentrations of salts,and heavy water(D2O) vs (H2O) interfaces,on adsorbate orientationaland solvation dynamics in water have been measured. In addition the dynamics of electron transfer at an organic liquid/water interface have been performed. SHG/SFG experiments at air/water interfaces have measured:polarity at a polystyrene sulfonate/water interface,acid-base equilibria at polystyrene nanoparticle carboxylate/water interface, the presence of organic ions at the air/water interface, and the structure of water beneath an acetonitrile monolayer at the air/acetonitrile solution interface has been investigated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2010
- Accession Number
- ADA533357
Entities
People
- Kenneth B. Eisenthal
Organizations
- Columbia University