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Ghasali E.,Materials and Energy Research CenterAlborz | Shirvanimoghaddam K.,Deakin University | Pakseresht A.H.,Materials and Energy Research CenterAlborz | Alizadeh M.,Materials and Energy Research CenterAlborz | Ebadzadeh T.,Materials and Energy Research CenterAlborz
Journal of Alloys and Compounds | Year: 2017

Aluminum-TaC composites containing 5, 10 and 15 wt% TaC as reinforcement particles were prepared by spark plasma sintering method. A high-energy ball mill was used to mix initial powders. All of the samples were sintered at 450 °C and the measurement results indicated that the maximum relative density, bending strength were achieved with 5 wt% TaC. XRD investigations revealed only aluminum and TaC as identified phases and no additional phase was detected due to the reaction between matrix and reinforcement particles. SEM observations and EDS analyses demonstrated the agglomeration of reinforcement particles in composites containing 10 and 15 wt% TaC, while the uniform distribution of aluminum and TaC particles was found in composite containing 5 wt% reinforcement. © 2017 Elsevier B.V.


Ghasali E.,Materials and Energy Research CenterAlborz | Pakseresht A.H.,Materials and Energy Research CenterAlborz | Alizadeh M.,Materials and Energy Research CenterAlborz | Shirvanimoghaddam K.,Deakin University | Ebadzadeh T.,Materials and Energy Research CenterAlborz
Journal of Alloys and Compounds | Year: 2016

The effect of sintering method on the structure and mechanical properties of aluminum −10 wt% VC composite was investigated. Aluminum-VC metal matrix composite was prepared successfully by conventional (at 600 °C), microwave (at 600 °C) and spark plasma sintering (at 450 °C). The obtained results indicate that the aluminum −10 wt% VC composite prepared by SPS had the highest relative density (99 ± 0.6 ± %TD), bending strength (295 ± 15 MPa) and microhardness (232 ± 16 Vickers). The XRD investigations showed the decomposition of VC phase and the formation of Al3V intermetallic phase in the microwave-sintered samples. The SEM micrographs and EDS analyses revealed uniform distribution of reinforcement particles in SPS method and the formation of Al3V phase in microwave-sintered sample. © 2016


Amirjani A.,Materials and Energy Research CenterAlborz | Bagheri M.,Materials and Energy Research CenterAlborz | Heydari M.,Materials and Energy Research CenterAlborz | Hesaraki S.,Materials and Energy Research CenterAlborz
Sensors and Actuators, B: Chemical | Year: 2016

In this study, silver nanoparticles were synthesized using Kiwifruit extract. Response surface methodology (RSM) was successfully used to study the effects of AgNO3 concentration and the quantity of Kiwifruit extract on the production of biosynthesized silver nanoparticles. A suitable model between the factors (AgNO3 concentration and the quantity of Kiwifruit extract) and the response (production yield) was statistically developed. Based on the statistical analysis, the first order of extract volume has the most impact on the production yield of silver nanoparticles. Also, the production yield is affected by the second order term of extract volume more significantly than AgNO3 concentration. Further, the interaction between both factors is statistically significant. Under the optimum conditions (AgNO3 concentration >1.9 × 10-3 M and amount of Kiwifruit extract ≈1.0 ml); silver nanoparticles in the mean size of 20 nm with stability more than 12 months were synthesized. Also, a localized surface plasmon resonance sensor based on silver nanoparticles was developed for determination of H2O2. This sensor has a linear range of 5.0 × 10-5-5.0 × 10-3 M with a limit of detection value as low as 5.0 × 10-7 M. The applicability of the sensor was demonstrated by analysis of H2O2 in packing sterilant solutions and interference study. © 2015 Elsevier B.V. All rights reserved.

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