Ultrafast optical Kerr effect spectroscopy of water confined in nanopores of the gelatin gel.
We report on the investigation of a short-time collective dynamics of water confined in the pores of the gelatin gel, using the femtosecond optical Kerr effect spectroscopy. The ultrafast responses of water molecules obtained in bulk liquid and in three concentrations of gelatin gels are explained theoretically, both in a long time and in a short time regime, taking into account all molecular motions. We prove that the contribution of molecules involved in tetrahedral, strongly H-bonded structures stabilizing the gel network increases with the gel concentration. On the other hand the long-time relaxation of water molecules is significantly slowed down in the gel pores.
Ratajska-Gadomska
B
B
Laboratory of Physicochemistry of Dielectrics and Magnetics, Department of Chemistry, Warsaw University, ul. Zwirki i Wigury 101, 02-089 Warsaw, Poland. gado@chem.uw.edu.pl
Bialkowski
B
B
Gadomski
W
W
Radzewicz
Cz
C
D003198:Computer Simulation; D005780:Gelatin / Q000737:chemistry*; D005782:Gels / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D055095:Optics and Photonics; D016062:Porosity; D013057:Spectrum Analysis / Q000379:methods*; D014867:Water / Q000737:chemistry*
D005782:Gels; D014867:Water; D005780:Gelatin