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- 저자 : M. Fathalian (검색결과 2 건)
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M. Fathalian,M. Ghorbanzadeh Ahangari,A. Fereidoon 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8
An investigation of nanosilica (SiO2), influencing the mechanical and thermal attributes of carbon fiber (CF)/polycarbonate (PC) laminates, is described in this study. Polycarbonates with four different weight percentages of SiO2 (PCSiO2,0.1, 0.3, 0.6 and 1.0 wt%) were prepared using a melt-blending technique. The PC-SiO2 nanocomposites were thenused to fabricate planar CF/PC laminates through a hot hydraulic press machine. The prepared laminates were characterizedby a number of different techniques; namely, tensile tests, dynamic mechanical thermal analysis (DMTA), differentialscanning calorimetry (DSC), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). The tensile testfindings revealed that when 0.6 wt% of SiO2 was added to the laminate layers, the maximum tensile modulus and yield stresswere achieved. The mechanical properties obtained by DMTA supported the tensile test results. It should be noted that the0.6 wt% of SiO2 had the highest mechanical properties. The DMTA and DSC analyses were used to measure the glasstransition temperatures (Tg) of laminates. We found that with the addition 0.6 wt% of SiO2 the Tg increased to approximately1 oC compared to 0 oC for the neat CF/PC laminate, meaning that by adding up 0.1 to 0.6 nanosilica to the polymer, the valueTg first increased and then decreased. To characterize the mass loss, the thermal degradation of polycarbonate influenced bynitrogen was investigated through TGA. According to our TGA results, the highest thermal stability was achieved by adding0.6 wt% of SiO2 to the PC.
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Ab initio Calculations of Electronic and Optical Properties of BeO Nanosheet
Sh. Valedbagi,J. Jalilian,S. M. ELAHI,S. Majidi,A. Fathalian,V. Dalouji 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
The electronic and the linear optical properties of BeO nanosheet and wurtzite structure are investigated by using the full potential linear augmented plane wave plus local orbital (FPLAPW + lo) in the frame work of the density functional theory (DFT). The dielectric tensor is derived within the random phase approximation (RPA). Specifically, dielectric function, absorption coefficient, optical conductivity, extinction index, loss function, reflectivity and the refraction index of the BeO nanosheet are calculated for both parallel and perpendicular electric field polarizations. The results show that the optical conductivity in E|| x starts with a gap about 5.89 eV confirms that BeO nanosheet has semiconductor property also the optical spectra are anisotropic along these two polarizations. The static refractive index of nanosheet is smaller than wurtzite structure.
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