Azarbaijan Shahid Madani University

About: Azarbaijan Shahid Madani University is a education organization based out in Tabriz, Iran. It is known for research contribution in the topics: Graphene & Nanocomposite. The organization has 1477 authors who have published 3186 publications receiving 30278 citations. The organization is also known as: Azarbaijan University.

Mechanical activation process for self-propagation high-temperature synthesis of ceramic-based composites

Abstract: In this study, the mechanical activation process of the Al–TiO2–H3BO3 thermite mixture was modeled and optimized before self-propagation high-temperature synthesis of Al2O3–TiB2 ceramic composite powders For this purpose, response surface method in conjunction with full factorial design was conducted for evaluating the experiments and modeling the process The milling speed and milling time were considered as the process input parameters In addition, the intensity and temperature of the last exothermic peaks in DSC curves, which correspond to the occurrence of self-propagation high-temperature synthesis process, were chosen as the responses Analysis of variance was employed for checking the accuracy of the developed models Furthermore, the effects of milling speed and time on the responses were explored using the developed methods, in detail The results showed that the models were significant and they predicted the responses accurately Moreover, the milling time was obtained to be more effective parameter on the responses The optimized condition for the mechanical activation was 340 rpm and of 1763 h for milling speed and milling time, respectively

Strength-ductility trade-off via SiC nanoparticle dispersion in A356 aluminium matrix

Abstract: A process was developed to disperse β-SiC nanoparticles (NPs), with a high propensity to agglomerate, within a matrix of A356 aluminum alloy. A suitable dispersion of 1 wt% SiC NPs in the A356 matrix was obtained through a hybrid process including a solid-state modification on the surface of the NPs, a two-step stirring process in the semi-solid and then the liquid-state, and a final hot-rolling process for fragmentation of the brittle eutectic silicon phase and porosity elimination. Titanium and nickel where used as the nanoparticle SiC surface modifiers. Both modifiers were found to improve the mechanical properties of the resulting material, however, the highest improvement was found from the nickel surface modification. For the nickel modification, compared to the non-reinforced rolled alloy, more than a 77%, 85%, and 70% increase in ultimate tensile strength (UTS), yield strength (YS), and strain % at the break, respectively were found with respect to the unreinforced rolled A356. For the rolled nanocomposite containing 1 wt % SiCnp and nickel modification, an average YS, UTS, and strain % at the break of 277 MPa, 380 MPa, and 16.4% were obtained, respectively, which are unique and considerable property improvements for A356 alloy.

Copper immobilized onto polymer‐coated magnetic nanoparticles as recoverable catalyst for ‘click’ reaction

Abstract: Copper supported on polymer-coated magnetic nanoparticles was designed and synthesized as a separable heterogeneous catalyst. The catalyst was fully characterized using several techniques such as Fourier transform infrared and energy-dispersive X-ray spectroscopies, scanning and transmission electron microscopies, X-ray diffraction, vibrating sample magnetometry, thermogravimetric analysis and inductively coupled plasma atomic emission spectrometry. All results showed that copper was successfully supported on the polymer-coated magnetic nanoparticles. Also, results showed that the synthesized material can be used as an efficient catalyst for the preparation of a series of 1,4-disubstituted 1,2,3-triazoles from corresponding halides, alkynes and sodium azide. The catalyst can be easily isolated from the reaction solution by applying an external magnet and reused for nine runs without any significant loss of catalytic activity.

Black hole thermodynamics and modified GUP consistent with doubly special relativity

Abstract: We study the black hole thermodynamics and obtain the correction terms for temperature, entropy, and heat capacity of the Schwarzschild black hole, resulting from the commutation relations in the framework of Modified Generalized Uncertainty Principle suggested by Doubly Special Relativity.