Abstract
Carbonized wheat bran samples were studied by electron paramagnetic resonance (EPR) spectroscopy, elemental analysis and electron microscopy. The carbonization was performed in the temperature range from 250 to 800 °C in argon medium. The carbon content increased with temperature. At high temperatures a sharp decrease in the concentration of free radicals takes place. It is shown that at high temperatures the EPR line width reduces from 0.87 (initial) to 0.11 mT. This phenomenon is explained by the fact that at high temperatures there occurs the formation not only of graphitelike structures (classical interpretation) but also of different nanosize structures. The electron microscopy data verify the formation of different forms of nanostructures in the carbonized wheat bran samples.
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Ryabikin, Y.A., Yemuranov, M.M., Zashkvara, O.V. et al. Influence of carbonic nanostructure formation on EPR line parameters during carbonization of wheat bran. Appl Magn Reson 35, 231–238 (2009). https://doi.org/10.1007/s00723-008-0157-x
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DOI: https://doi.org/10.1007/s00723-008-0157-x