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您的检索式：作者名="M.K.Halimah"
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| 1 | Effects of Increasing Tungsten on Structural,Elastic and Optical Properties of xWO_3-(40-x)Ag_2O-60Te_2O Glass System显示文摘Ternary teiiurite glasses with composition of xWO_3(40-x)Ag_2O-60TeO_2(x=0-40 mol%) have been prepared by melt-quenching method.Elastic and optical properties of the glass system were obtained by ultrasonic velocity measurements and UV-vis spectroscopy,respectively,while structural investigation was carried out by using Raman spectroscopy.The longitudinal and shear velocities,v_L and v_s showed large increase at x from 0 to 20 mol%before decrease with further addition of WO_3.Independent longitudinal modulus C_L and shear modulus μ bulk modulus K_e Young's modulus Vand Debye temperature θ_D showed similar behaviors to both velocities.The large increase of the elastic moduli at x from 0 to 20 mol%is suggested to be due to the increase in WO_6 octahedral unit structure indicating the increase of bridging oxygen(BO) and formation of stronger Te-O-W bonds compared to Te-O-Te bonds.On the other hand,forx> 20 mol%,the decrease in the elastic moduli was due to the increase of non-bridging oxygen(NBO) as a result of formation of WO_4tetrahedral via breaking Te-O-W network.Further analysis by using bulk compression and ring deformation models showed a slight decrease in the ratio of ideal bulk modulus K_(bc) to the experimental bulk modulus K_e and average atomic ring size,/ for×< 20 mol%followed by a large increase for x > 20 mol%.Our analysis also indicates that limited ring deformation took place and the main compression mechanism in this glass system was mainly ideal isotropic compression.On the other hand,optical band gap E_(opt) showed small variation for x=0-20 mol%but decreased upon higher WO_3 content while refractive index n showed the opposite trend.This optical behavior is suggested to be related to the changes in cross link density and NBO concentration in the glass system. | MM.Umair A.K.Yahya M.K.Halimah H.A.A.Sidek | 2015 | Journal of Materials Science & Technology2015，31，1： | 2 |
| 2 | Polypyrrole Chitosan Cobalt Ferrite Nanoparticles Composite Layer for Measuring the Low Concentration of Fluorene Using Surface Plasmon Resonance显示文摘Fluorene is a polycyclic aromatic hydrocarbon,which is a hazardous toxic chemical in the environment. The measurement of low concentrations of fluorene is a subject of intense interest in chemistry and in the environment. Polypyrrole chitosan cobalt ferrite nanoparticles are prepared using the electrochemical method. The prepared layers are characterized using field emission scanning electron microscopy, Fourier transform infrared spectroscopy; and energy dispersive spectroscopy. The layers are used to detect fluorene using the surface plasmon resonance technique at room temperature. The composite layer is evaluated after detection of fluorene using atomic force microscopy. The fluorene is bound on the layer,and the shift of the resonance angle is about 0.0052°,corresponding to the limitation of 0.01 ppm. | A.R.Sadrolhosseini M.Naseri M.K.Halimah | 2017 | Chinese Physics Letters2017，34，5： | 0 |
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