Electrospinning is a simple and quick technique for producing fibers with nanoscale diameters from a wide range of materials. The Polyvinylalcohol PVA Polymer dissolved in the DMF was electrospun to obtain the alignment nanofibers PVA. The nanofibers were obtained using 25 wt% solution concentration, an applied voltage 10 kV, spinning distance10 cm and different flow rates of 0.1, 0.2, and 0.3 ml/hr. The properties of alignment nanofibres including morphology, crystallization, functional group and the effect of flow rates on it was studied. The morphology of the electrospun PVA nanofibres is studied using scanning electron microscopy (SEM). Structural characteristics analysis by X-ray diffraction (XRD) that showed the crystalline peaks of the PVA nanofibers. The formation of functional groups of PVA polymer was predicted by the FT-IR spectra
In this study, the effect of gamma irradiation on PAni.MWCNT/PMMA films was investigated, for using them as dosimeters. In particular, the effects of gamma irradiation on the morphological characteristics, structure, electrical conductivity, and some optical properties of PAni.MWCNT/PMMA films were studied before and after irradiation. Samples were fabricated by casting method, obtained by using PAni.MWCNT with 3.8 wt% PMMA weight ratio, and exposed to a (Cs 137 ) gamma-radiation source at different dose rates (0, 2.7, and 4.8 kGy) at room temperature. The morphological characteristics of the PAni.MWCNT/PMMA films were examined through scanning electron microscopy. X-ray diffraction analysis revealed the effect of irradiation on the structure and average crystallite size of the films. The FTIR was carried out for samples within the range 600-4000 cm −1 to study the functional groups of PAni.MWCNT/PMMA films, and the presence of characteristic bonds of PAni.MWCNT/PMMA films were observed using FTIR spectroscopy technique. Electrical conductivity analysis showed that the conductivity of the unirradiated film of 2.02×10 −8 S.cm −1 increased to 2.77×10 −8 S.cm −1 after the samples were exposed to 4.8 kGy. The absorption spectra of the PAni.MWCNT/PMMA films were also obtained. Spectral analysis demonstrated that optical transition was an allowed direct transition, and the optical band gap increased as the radiation dose increased. The observed changes in these physical properties suggested that PAni.MWCNT/PMMA films may be used as an effective material for gamma radiation dosimeters at room temperature.
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