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Electron Spin Resonance of Gamma Irradiated Single Crystals of Acetylcholine ß-Resorcylate

100%
Birey M., Aktaş H., Alicilar A.
Acta Physica Polonica A
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1992
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vol. 81
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issue 6
607-611
EN
The electron spin resonance of γ-irradiated single crystals of acetylcholine β-resorcylate has been observed and analyzed for different orientations of the crystals in a magnetic field. C_{14}H_{21}NO_{6} acetylcholine β-resorcylate single crystals and powders have been investigated between 120 and 360 K. The spectra were found to be isotropic down to 120 K. The isotropic value of g-factor and the hyperfine splitting constant of protons were found to be 2.0030 and 1.85 mT, respectively. The measurements indicate that 80% of unpaired electron is localized on the carbon and 20% is on the oxygens. The results are consistent with the literature data of the CH_{3}COO¯ radical.
2
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In Vitro Analysis of AHPlus and MM-Seal by ESR and Thermoanalytical Methods

76%
Ceylan Y., Usta A., Usta K., Kont Cobankara F., Yildirim C., Birey M.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2B
B-479-B-482
EN
The free radicals and their concentration in resin materials may impact biocompatibility and polymerization properties of dental materials. The aim of this study was to determine whether there are free radicals and to obtain useful information about thermal stability of materials using electron spin resonance (ESR) spectroscopy, TGA (Thermogravimetry Analysis) and DTA (Differential Thermal Analysis) methods. Epoxy resin-based sealers AHPlus and MM-Seal samples, freshly mixed and set, were prepared to be analysed with ESR and thermal methods. The free radicals were found in dental materials. As radical concentration in AHPlus have changed very slowly, the concentration in MM-Seal have decreased dramatically. Also, MM-Seal was found to decompose in three steps with the increasing temperature, while decomposition of the AHPlus occurred in two steps.
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