EPR monitoring of sol-gel processes Academic Article uri icon

abstract

  • Electron Paramagnetic Resonance (EPR) spectra of paramagnetic probes (free radical, 4- oxo-Tempo for non-doped glasses and vanadyl sulfate for doped silica glass) provide a non- intrusive means of monitoring of the dynamics of the sol-gel process. The free radical spectra parameters (rotation correlation time, isotropic hyperfine interaction parameter and line width) reflect changes in viscosity and polarity in the vicinity of the spin label. The EPR spectra of vanadyl can be used for monitoring the sol-gel process in that different types of …

publication date

  • January 21, 1994