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Rare earth elements distribution in marine sediments of Malaysia coasts

Journal of Rare Earths 2009年第6期27卷 1066-1071页

作者： Rezaee Ebrahim Saraee Khadijeh saion b.elias Abdul Khalik Wood Abdi Mohammad Reza Universiti Putra Malaysia Physics Department Instrumental Technology Division Malaysian Institute for Nuclear Technology Research(MINT) Department of physics Faculty of ScienceUniversity of Isfahan

In the east coast Peninsular Malaysia region,sediments are transported by several rivers from the east Malaysia into the South China Sea *** the vicinity of the five river estuaries core sediments were collected in order to investigate rare earth elements(REEs) *** sediments were divided into strata of between 2 to 4 cm intervals and prepared for analyzing by *** concentrations of 54.3 μg/gr at 24–26 cm in EC4 increased to 114.1 μg/gr at 20–22 cm in *** measured concentration of ...

关键词： enrichment factor rare earth elements marine sediments South China Sea shale average

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

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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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Silver Nanoparticle Fabrication by Laser Ablation in Polyvinyl Alcohol Solutions

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Chinese Physics Letters 2014年第7期31卷 193-196页

作者： Halimah Mohamed. K Mahmoud Goodarz Naseri Amir Reza Sadrolhosseini Arash Dehzangi Ahmad Kamalianfar elias b saion Reza Zamiri Hossein Abastabar Ahangar burhanuddin Y. Majlis Department of Physics Faculty of Science Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Department of Physics Faculty of Science Malayer University Malayer Iran Wireless and Photonics Networks Research Center of Excellence (WiPNET) Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Institute of Microengineering and Nanoelectronics (IMEN) Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Department of Physics 3ahrom University Jahrom Iran Department of Chemistry Faculty of Science Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia

A laser ablation technique is applied for synthesis of silver nanoparticles in different concentrations of polyvinyl alcohol （PVA） aqueous solution. The ablation of high pure silver plate in the solution is carried out by a nanosecond Q-switched Nd：YAG pulsed laser. X-ray diffraction and transmission electron microscopy are implemented to explore the particles sizes. The effects of PYA concentrations on the absorbance of the silver nanoparticles are studied as well, by using a UV-vis spectrophotometer. The preparation process is carried out for deionized water as a reference sample. The comparison of the obtained results with the reference sample shows that the formation efficiency of nanoparticles in PYA is much higher and the sizes of particles are also smaller.

关键词： SILVER nanoparticles METAL fabrication LASER ablation POLYVINYL alcohol AQUEOUS solutions

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Rate of elapsed polymerization of hydroxyethylacrylate gel induced by gamma irradiation

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Nuclear Science and Techniques 2008年第4期19卷 218-222页

作者： Khalid Ahmed RAbAEH elias saion Mohammad Ahmed Ali OMER Azhar Abdul RAHMAN Mohammad Yusif HUSSAIN Shahrim ISKANDAR Noria Mohammad ALI Department of Physics Universiti Putra Malaysia 43400 UPM SerdangSelangorMalaysia Nuclear Agency of Malaysia

The rate of elapsed polymerization of polyhydroxyethylacrylate in gelatin has been studied to investigate the effect of co-monomers consumption at a given dose. The polymer gel dosimeters consisted of 2%～4% N,N-methyelene-bis-acrylamide cross-linker,2%～4% 2-hydroxyethylacrylate monomer and gelatin at 3% and 5%. The dosimeters were irradiated by using 60Co teletherapy γ-ray source up to 20 Gy at a constant dose rate. The relaxation rate of water proton in the dosimeters at different doses and co-monomer concentrations were measured using a nuclear magnetic resonance spectroscopy. The rate of elapsed polymerization decreases with increasing the dose and the initial concentration of co-monomers. The rate of consumption of co-monomers increases with an increase of the polymerization and the gelatin content of the polymer gel.

关键词：高聚物缓和速度剂量器射线

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Role of PVP on the Phase Composition and Morphology of Manganese Ferrite Nanoparticles Prepared by Thermal Treatment Method

Role of PVP on the Phase Composition and Morphology of Manga...

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2012 2nd International Conference on Environment Science and biotechnology

作者： Mahmoud Goodarz Naseri elias b.saion Abdul Halim Shaari Department of Physics Faculty of Science Malayer University Department of Physics Universiti Putra Malaysia

Manganese ferrite nanocrystals were prepared from an aqueous solution containing metal nitrates and various of concentrations of poly（vinyl pyrrolidone） as a capping agent to stabilize the particles and prevent them from agglomerating. To stabilize the particles, they were thermally treated at 873 K as an optimum calcination temperature. The presence of the crystalline phase in each sample was confirmed by X- ray diffraction （XRD） analysis that showed that the presence of the PVP increased the degree of crystallinity of the nanoparticles that were formed. The average particle size and the morphology of the manganese ferrite nanoparticles were determined by transmission electron microscopy （TEM）, and these parameters were found to differ with the various concentrations of PVP. Fourier transform infrared spectroscopy （FT-IR） confirmed the presence of metal oxide bands for all of the PVP concentrations and confirmed the absence of organic bands for PVP concentrations less than 0.055 gm/ml.

关键词： Nanoparticles Poly(vinyl pyrrolidone) Thermal treatment

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Synthesis and Characterization of Ni-Zn Ferrite Nanoparticles (Ni0.25Zn0.75Fe2O4) by Thermal Treatment Method

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Advances in Nanoparticles 2013年第4期2卷 378-383页

作者： Poh Lin Leng Mahmoud Goodarz Naseri elias saion Abdul Halim Shaari Mazaliana Ahmad Kamaruddin Department of Physics Faculty of Science Malayer University Malayer Iran Department of Physics Faculty of Science Universiti Putra Malaysia Serdang Malaysia

Cubic structured nickel-zinc ferrite nanoparticles (Ni0.25Zn0.75Fe2O4) have been synthesized by thermal treatment method. In this procedure, an aqueous solution containing metal nitrates as precursors, polyvinyl pyrrolidone as a capping agent, and deionized water as a solvent were thoroughly stirred, dried at 353 K for 24 h, and crushed into powder before calcination to remove organic matters and crystallize the particles. The structure and particle size were characterized by X-ray powder diffraction and transmission electron microscopy. The average particle size increased from 7 to 25 nm with increase of calcination temperature from 723 to 873 K respectively. The magnetic properties were determined by vibrating sample magnetometer and electron paramagnetic resonance electron paramagnetic resonance at room temperature. by increasing the calcinations temperatures from 723 to 873 K it showed an increase of the magnetization saturation from 11 to 26 emu/g and the g-factor from 2.0670 to 2.1220. The Fourier transform infrared spectroscopy was used to confirm the presence of metal oxide bands at all temperatures and the removal of organic matters at 873 K.

关键词： Thermal Treatment Nickel Zinc Ferrite Nanoparticles Magnetic Property

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