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Optical Properties of CdS/PVA Nanocomposite Films Synthesized using the Gamma-Irradiation-Induced Method

Chinese Physics Letters 2013年第5期30卷 160-164页

作者： Alireza Kharazmi Elias Saion Nastaran Faraji nayereh soltani Arash Dehzangi Physics Department Faculty of ScienceUniversity Putra MalaysiaSerdang 43400Malaysia Institute of Microengineering and Nanoelectronics Universiti Kebangsaan MalaysiaBangi 43600Malaysia

Monodispersed spherical CdS nanoparticles embedded into polyvinyl alcohol (PVA) films are synthesized by using an in-situ gamma-irradiation-induced method. The formation mechanism of CdS nanoparticles capped by two united cells of PVA is purposed by means of surrounding the CdS nanoparticles with OH bonds of the PVA chain. CdS nanoparticles are found to possess an unusual orthorhombic structure in monoclinic crystalline PVA. The polymer matrix affords protection from agglomeration and controls the particle size. It is found that the distribution of the prepared nanoparticles increases and a narrower size distribution is observed when the gamma radiation is varied from 10 to 50 kGy. While the average size of the nanoparticles is found to be less affected by the variation of the gamma radiation doses. The size range of the synthesized nanoparticles is 14±1 nm. The optical absorption spectra of synthesized CdS nanoparticles in a polymer matrix reveal the blue shift in the band gap energy with respect to CdS bulk materials owing to quantum confinement effect. The photoluminescence study of nanocomposite films shows the green emission arising from the crystalline defects.

关键词： nanoparticles composite crystalline

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INAA to Determine Trace Element Concentrations in the Hair of Street Children of Isfahan City, Iran

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World Journal of Nuclear Science and Technology 2013年第4期3卷 117-122页

作者： Khadijeh Rezaee Ebrahim Saraee Mohammad Reza Abdi Mohammad Mehdi Gharipour nayereh soltani Department of Nuclear Engineering Faculty of Advance Sciences and Technologies University of Isfahan Isfahan Iran Department of Physics Faculty of Science University of Isfahan Isfahan Iran Departments of Physics Universiti Putra Malaysia UPM Serdang Selangor Malaysia Safahan Institute of Higher Education Isfahan Iran

This study aimed to assess trace element concentrations in the hair of street children. Nutritional status was assessed by 24 hours’ dietary recall and anthropometric measurements. Data analysis found that Br, Sc, Sm and Ti concentrations show a normal distribution, and there is no significant difference between street children and control group. However, in the street children’s hair, the levels of Au, U, V are decreased and the levels of Co, La, Sb, Th are increased compared to the control group.

关键词： Hair INAA Isfahan Street Children Trace Elements

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