Accession Number:

ADA533357

Title:

Nonlinear Spectroscopu of Nanoparticle/Aqueous Interface

Descriptive Note:

Final rept. 15 Mar 2007-14 Mar 2010

Corporate Author:

COLUMBIA UNIV NEW YORK

Personal Author(s):

Report Date:

2010-10-01

Pagination or Media Count:

15.0

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 waterD2O vs H2O interfaces,on adsorbate orientationaland solvation dynamics in water have been measured. In addition the dynamics of electron transfer at an organic liquidwater interface have been performed. SHGSFG experiments at airwater interfaces have measuredpolarity at a polystyrene sulfonatewater interface,acid-base equilibria at polystyrene nanoparticle carboxylatewater interface, the presence of organic ions at the airwater interface, and the structure of water beneath an acetonitrile monolayer at the airacetonitrile solution interface has been investigated.

Subject Categories:

  • Physical Chemistry
  • Miscellaneous Materials
  • Theoretical Mathematics
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE