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Articles by Hassan A. Majeed
Total Records ( 2 ) for Hassan A. Majeed
  Nagham M. Obaid , Ghaleb Al-Dahash , Hassan A. Majeed and Asmaa Mahmood Hayder
  In this research study the behavior of the subject of the oscillation resonance Surface Plasmon (SPR) and the size and shape of nanoparticles for alloy Au50: Ag50 prepared in a manner laser ablation in pure water and Sodium Dodecyl Sulphate (SDS) solution and at three different concentrations 0.25, 0.09, 0.01 molar. Where showed SEM pictures of colloidal nanoparticles for Au50:Ag50 alloy composition of two types of forms of nanoparticles, one cube-shaped in the case of energy use 730 mJ and the other on a spherical shape when energy use 430 mJ in a (SDS) solution and at wavelength 1064 nm. Laser ablation for the alloy under the influence of magnetic field led to increase the concentration and size of nanoparticles which led to the removal of the top of the subject of the oscillation resonance surface plasmon towards larger wavelengths, X-Ray Diffraction (XRD) spectra of colloidal nanoparticles of alloy prepared in water it showed when to shed the magnetic field during laser ablation process plays an important role in improving the optical properties of the NPs.
  Nagham M. Obaid , Ali K. Shakir , Amer Al-Nafiey and Hassan A. Majeed
  The paper study the effect of the laser pulse on the size and thickness of the Ptshell nanoparticles prepared by laser ablation in water in different pulses 100, 150, 200 and 250. The structural properties of the prepared samples were analyzed by using a transmission electron microscopy (TEM) and Uv-visible spectrometer. The results showed they are a possibility of preparing the Ptshell with different sizes and thickness surrounding Agcore, where shell thickness ranging from 8.3-20.1 nm and the Uv-vis shown the peak absorption of the Ag core: Ptshell is shifted from 410-388 nm according to increase the number of laser pulses on the platinum target on the collided Ag NPs, indicating that the Ptshell effect will have an influence more than the Ag NPs core.
 
 
 
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