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Analysis of Spectroscopic, Optical and Magnetic Behaviour of PVDF/PMMA Blend Embedded by Magnetite (Fe<sub>3</sub>O<sub>4</sub>) Nanoparticles

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Optics and Photonics Journal 2020年第8期10卷 197-209页

作者： laila H. gaabour Department of Physics College of Science University of Jeddah Jeddah Saudi Arabia

In the present work, magnetite (Fe3O4) nanoparticles have been prepared by a simple chemical method. Polymer nanocomposites based on the blend between poly vinylamine fluoride (PVDF) and (methyl methacrylate) (PMMA) doped with different concentrations of Fe3O4 nanoparticles have been prepared. The structural, optical, and magnetization properties of the nanocomposite samples were studied using suitable techniques. The X-ray study reflected that the cubic spinal structure of pure Fe3O4 crystal. No small peaks or ripples were found in the X-ray spectra, conforming to good dispersion of Fe3O4 within PVDF/PMMA matrices. The FT-IR analysis demonstrated the miscibility between the PVDF and PMMA blend with the interaction between the polymer blend and Fe3O4. The values of the band gap from UV-Vis study were decreased up to 4.21 eV, 3.01 eV for direct and indirect measurements, respectively. The magnetization was measured as a function of the applied magnetic field in the range of −2000 - 2000 Oersted. The curves of the magnetization indicated a paramagnetic behavior of pure Fe3O4 nanoparticles and PVDF/PMMA-Fe3O4 nanocomposites. The values of saturation magnetization for pure Fe3O4 are nearly 75 emu/g, exhibiting a paramagnetic behavior, and it is decreased with the increase of Fe3O4 content.

关键词： PVDF/PMMA Blend Magnetite (Fe3O4) Nanoparticles XRD FT-IR UV-Vis Spectroscopy Magnetization Properties

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Numerical Investigation of the Plasma Formation in Distilled Water by Nd-YAG Laser Pulses of Different Duration

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Journal of Modern Physics 2012年第10期3卷 1683-1691页

作者： laila H. gaabour Yosr Ezz El Din Gamal G. Abdellatif Department of Physics Girl’s Faculty of Science King Abdul-Aziz University Jeddah KSA Physics Department Faculty of Science Cairo University Giza Egypt

Water breakdown studies by Nd-YAG laser pulses of duration 100 fs, 30 ps and 6 ns at wavelength 1064 nm are pre- formed to investigate the physical mechanisms which couple the laser energy into the medium. Calculations are carried out applying a modified kinetic model of water breakdown previously developed by Kennedy (1995) to investigate the correlation between threshold intensity of breakdown and laser pulse length. The modifications considered the introduction of diffusion and recombination loss processes which might take place under the experimental conditions applied in these calculations. The validity of the model is tested by comparing the calculated threshold intensities and the experimentally measured ones where good agreement is shown. The study of the time evolution of the electron density clarifies the correlation between the pulse length and dominant ionization mechanism. The analysis of the spatial distribution of the electron density along the radial and axial distances of the focal spot showed that the size of the formed plasma increases with the increase of the pulse length. On the other hand, studies of self-focusing effect illustrated that under the investigated experimental conditions the effect of this process has an effective contribution only at laser pulses of the order of femtosecond scale when the laser beam is focused by a lens of a focal length ≥8.0 cm. This result in turns assures that using femtosecond pulses in ophthalmic microsurgery could be a safe tool from the retinal damage.

关键词： Laser Induced Breakdown Water Breakdown Electron Density Self Focusing Modeling of Plasma Formation Laser Medicine

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Energy Levels, Oscillator Strengths, and Transition Probabilities of Ni XIX and Cu XX

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Optics and Photonics Journal 2014年第3期4卷 54-89页

作者： Wessameldin S. Abdelaziz M. Atta Khedr Mai E. Ahmed laila gaabour Tharwat El-Shirbini Environmental Affairs Agency Cairo Egypt Laboratory of Lasers and New Materials Cairo University Giza Egypt National Institute of Laser Enhanced Sciences Cairo University Giza Egypt Physics Department Faculty of science King Abdul Aziz University Jeddah Saudi Arabia

Energy levels, oscillator strengths, and transition probabilities, for the 1s2 2s2 2p6, 2p53l (l = 0, 1, 2), 2p54l (l = 0, 1, 2, 3) states in Ni XIX and Cu XX are calculated using COWAN code. The Correlation and relativistic effects are considered. The calculations are compared with other results in the literature. A good agreement is found. We also report on some unpublished energy values.

关键词： Energy Levels Oscillator Strengths Transition Probabilities

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