Location: Bowdoin / Calendar

"Hydration-Shell Spectroscopy and Water-Mediated Interactions" Dor Ben-Amotz, Purdue University

  • 11/2/2012 | 3:00 PM – 4:00 PM
  • Location: Druckenmiller Hall, Room 020
  • Event Type: Seminar

"Hydration-Shell Spectroscopy and Water-Mediated Interactions" Dor Ben-Amotz, Purdue UniversityConventional vibrational spectroscopic methods, such as infrared absorption and Raman scattering, may be used to measure the vibrational fingerprints of molecules in the solid, liquid, and gas phase. We have developed a way of extending such methods in order to obtain vibrational signatures arising from the interactions between molecules, by combining Raman scattering and multivariate curve resolution (Raman-MCR). This method may be used to obtain spectra of the hydration-shells surrounding molecules dissolved in water as well as interactions between solute molecules. For example, we have used this approach to discover surprising things, such as the presence of free (non-hydrogen-bonded) OH groups in the hydration-shells of alkane chains, and interesting temperature and chain-length dependent changes in the structure of water in hydrophobic hydration-shells. We are currently working on extending this strategy to investigate the interactions between salt ions and hydrophobic groups, and hydrophobic interactions between individual oil molecules in water.