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Preliminary spectroscopic investigation of tacrolimus TiO2 system

100%
Todica M., Udrescu L.
Open Physics
|
2011
|
vol. 9
|
issue 6
1536-1539
EN
The effect of air and UV exposure on the tacrolimus was observed by Raman and UV VIS spectroscopy. For moderate time exposure the chemical structure of tacrolimus is not affected. The absorption property of tacrolimus was enhanced by addition of TiO2.
2
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ESR and XRD investigation of effects induced by gamma radiation on PVA-TiO2 membranes

81%
Todica M., Stefan T., Trandafir D., Simon S.
Open Physics
|
2013
|
vol. 11
|
issue 7
928-935
EN
The effects of gamma radiation on the local structure of PVA membranes containing TiO2 were investigated by ESR and XRD methods. An intense ESR signal is observed after irradiation at 16 KGy dose. This signal appears only for irradiated samples and it is associated with the breaking of the polymeric chain, followed by local reorganization of the polymeric segments and the apparition of the unpaired electrons and free radicals. The intensity of the signal decreases with the concentration of TiO2, indicating a shielding effect of the dopand. That the modification of local order of the polymeric chains has been modified after irradiation is confirmed by XRD method.
3
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Preliminary spectroscopic investigation of some PVA membranes gamma irradiated

81%
Todica M., Udrescu L., Şimon S.
Open Physics
|
2012
|
vol. 10
|
issue 2
329-334
EN
The UV-VIS absorption property and the structural modification of PVA membranes gamma irradiated were investigated by XRD, UV-VIS and Raman spectroscopies. The increase of UV absorbance is observed after irradiation. This behavior is correlated with the scission effect and local ordering of the polymeric chain induced by irradiation. These effects were probed by XRD and Raman spectroscopy.
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