EPR Studies of Carbonized Cellulose - Oxygen Interactions
Languages of publication
EPR examination of cellulose carbonized at 400ºC and 600ºC has been performed. The aim of this work was to search a sample useful as the oximetric probe in biology and medicine. The higher paramagnetic centers concentration characterizes cellulose carbonized at 600ºC, which was found as the sensitive oximetric probe. Quasi-chemical bonds between cellulose molecules and paramagnetic O_2 molecules decrease paramagnetic centers concentration. A linear increase in paramagnetic centers concentration and a linear decrease in EPR linewidth with increasing time of sample evacuation were observed for cellulose carbonized at 600ºC. Oxygen affects spin-lattice interactions in carbonized cellulose.
- 1. B. Pilawa, A.B. Wieckowski, Fuel, 76, 1173, 1997
- 2. B. Pilawa, Evolution of Paramagnetic Centers during Thermal Decomposition of Macerals, WSP, Zielona Góra 2000 (in Polish)
Publication order reference