EPR Studies of Carbonized Cellulose - Oxygen Interactions

• Authors: B. Pilawa , R. Pietrzak , H. Wachowska , K. Babeł
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

61.66.Hq; 76.30.Rn

Discipline

• 76.30.Rn: Free radicals
• 61.66.Hq: Organic compounds

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 1
• Pages: 151-154

Dates

published

2005-07

received

2005-04-24

Contributors

author

B. Pilawa

• Institute of Coal Chemistry, Polish Academy of Sciences, Sowińskiego 5, 44-121 Gliwice, Poland

author

R. Pietrzak

• Laboratory of Coal Chemistry and Technology, Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

author

H. Wachowska

• Laboratory of Coal Chemistry and Technology, Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

author

K. Babeł

• Institute of Chemical Wood Technology, Agricultural Academy of Poznań, Wojska Polskiego 38/42, 60-637 Poznań, Poland

References

• 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)

Identifiers

DOI

10.12693/APhysPolA.108.151