An investigation on sintering behavior of nanostructured Cu-10, 20 wt. % Ni alloy powders
Hurieh
Mohammadzadeh
Faculty of Engineering, Urmia University, Urmia, Iran
author
Roya
Roohibakhsh
School of Metallurgical and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
author
Hamid Reza
Rezaie
School of Metallurgical and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
author
text
article
2021
eng
In this research study, nano-composite powder of Cu-Ni was synthesized from precursor salts of copper and nickel sulfates through chemical co-precipitation to yield the final product of Cu-10 and 20 wt. % Ni. The chemical co-precipitation was followed by two steps of thermal and thermochemical treatments; calcination and reduction, respectively. The compounds of Cu4SO4(OH)6, Ni(OH)2 andNiOOH were identified as green precipitation which was then calcined at 850 °C for 1 h to CuO-NiO. The reduction process, by hydrogen at 700 °C for 1 h, led to Cu-Ni nanostructure powder with crystallite size of 18-33 nm. This powder was sintered at different temperatures of 1050-1200 °C for 2 h. The microstructure of synthesized powders and sintered products were evaluated using the scanning electron microscope (SEM). The value of microhardness and density, and porosity content of the sintered samples were measured. For all sintering temperatures the lowest porosity and the highest value of density were observed for Cu-10% Ni. At the sintering temperature of 1200 °C, the relative density for both samples was similar, 99.4%. Maximum value of hardness, 81.22 Vickers, was obtained for Cu-20%Ni chemical composition which was sintered at 1200 °C. Energy Dispersive Spectroscopy (EDS) which was employed for elemental mapping revealed the elemental segregation of Cu and Ni towards inter-dendrite and dendrites regions, respectively, for the samples sintered at 1200 °C.
Asian Journal of Nanoscience and Materials
Sami Publishing Company
2645-775X
4
v.
2
no.
2021
95
112
https://www.ajnanomat.com/article_124853_79861d9de9951336274a5b162cbba9a7.pdf
dx.doi.org/10.26655/AJNANOMAT.2021.2.1
Removal of methylene blue from aqueous solution using Egyptian date pits
Mohamed Nasser
Mohamed
Military Technical College, Chemical Engineer Department, Cairo, Egypt
author
text
article
2021
eng
This study aimed to investigate Egyptian date pits' potential to remove a cationic dye, specifically methylene blue (MB), from aqueous solutions. Characteristics of methylene blue and interaction between methylene blue and Egyptian date pits were characterized using the Fourier transform infrared spectrometer, scanning electron microscope, and Brunauer– Emmett–Teller analysis. The effect of several parameters including, adsorbent dose, and contact time, temperature and pH solution were assessed. The adsorption was increased by decreasing dye concentration, temperature, increasing contact time and dosage up to equilibrium values which was 25 °C, 20 min, and 0.1 g adsorbent, respectively. At high pH, the adsorption was promising. The results demonstrated that the Egyptian date pits are an effective and good adsorbent for removing Methylene blue in wastewater.
Asian Journal of Nanoscience and Materials
Sami Publishing Company
2645-775X
4
v.
2
no.
2021
113
124
https://www.ajnanomat.com/article_124856_5cd129d92754a18e36fcb0b5f801b52d.pdf
dx.doi.org/10.26655/AJNANOMAT.2021.2.2
Chemoselective oxidation of sulfides to sulfoxides using a novel Zn-DABCO functionalized Fe3O4 MNPs as highly effective nanomagnetic catalyst
Elham
Ezzatzadeh
Department of Chemistry, Ardabil Branch, Islamic Azad University, Ardabil, Iran
author
text
article
2021
eng
In the present study, Zn–DABCO@Fe3O4 with a high surface area and readily was synthesized. The morphology, particle size distribution, and phase analysis of the Zn–DABCO@Fe3O4 nanopowders were characterized using the scanning electron microscope (SEM), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and X-ray diffraction (XRD) analysis. The prepared Zn–DABCO@Fe3O4 nanoparticle was utilized as efficient catalyst for selective oxidation of sulfides to sulfoxides using 30% H2O2 as oxidant. The products were achieved with good to excellent yields at room temperature with no over-oxidation of sulfoxides and disulfides to unexpected by-products. This catalyst can be magnetically recovered by applying an external magnet and reused for eight continuous cycles in both oxidation reactions without a notable loss in its catalytic activity. Furthermore, the oxidation of various sulfides was highly chemoselective, but O,O-acetals remained intact under the described reaction conditions.
Asian Journal of Nanoscience and Materials
Sami Publishing Company
2645-775X
4
v.
2
no.
2021
125
136
https://www.ajnanomat.com/article_126510_f2f39c1a1c66a287397abbdf6c2abc48.pdf
dx.doi.org/10.26655/AJNANOMAT.2021.2.3
Benzoic acid-functionalized α-Fe2O3 nanoparticles: synthesis, characterization, magnetic and optical properties
Aliakbar
Dehno Khalaji
Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran
author
Zahra
Palang Sangdevini
Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran
author
Seyyedeh Masomeh
Mousavi
Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran
author
Marketa
Jarosova
Institute of Physic of the Czech Academy of Sciences, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic
author
Pavel
Machek
Institute of Physic of the Czech Academy of Sciences, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic
author
text
article
2021
eng
In this work, a new iron precursor was prepared, calcinated at 500 °C and 600 °C. The final α-Fe2O3 products (named Fe-500 and Fe-600) were characterized using the Fourier transformed infrared spectroscopy (FT-IR), UV-Vis, X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) analysis. The results of the FT-IR analysis demonstrated thet the sharp peaks at wavenumbers 450-650 cm-1 confirmed the stretching vibration of Fe-O. The XRD results revealed that the product prepared at 500 °C was a mixture of 59% rhombohedral and 41% cubic phases of Fe2O3 with only 11% of cubic phase Fe2O3 in the sample processed at 600 °C. TEM images showed a slight increase in particle size by increasing the calcination temperature. The magnetic properties of the products depicted a weak ferromagnetic behavior.
Asian Journal of Nanoscience and Materials
Sami Publishing Company
2645-775X
4
v.
2
no.
2021
137
146
https://www.ajnanomat.com/article_128493_d273b8469bec6a55a81d84ad9c5688d2.pdf
dx.doi.org/10.26655/AJNANOMAT.2021.2.4
Synergistic effect of ionic liquid on additive performance of octyl acrylate-vinyl acetate copolymer and their comparison when added to lube oil
Pranab
Ghosh
Natural Product and Polymer Chemistry Laboratory, Department of Chemistry, University of North Bengal, Darjeeling–734013, India
author
Sultana
Yeasmin
Natural Product and Polymer Chemistry Laboratory, Department of Chemistry, University of North Bengal, Darjeeling–734013, India
author
text
article
2021
eng
Ionic liquids (ILs) have come out as a promising lubricant additive in base oil during the past few years due to their low volatility, non–flammability, thermal stability, moisture stability and miscibility with organic compounds. In the present work, an investigation was carried out to determine whether the flow improvement property and shear stability of a polymeric additive can be affected when blended with an ionic liquid. We prepared a copolymer of vinyl acetate and octyl acrylate and blended it with imidazolium–based IL. Their performance as pour point depressant (PPD), viscosity index improver (VII) and also their stability against the mechanical shear in terms of permanent shear stability index (PSSI) were determined when added to the base oil as solo additive or as blend. The results revealed that the blend outweighs the polymer and the IL in all respect as a lubricant additive. As PPD, the best result was obtained in case of the blend at 4% concentration in both the base oils i.e. –12.1 °C and –13.7 °C in BO1 and BO2 respectively. Kinematic viscosity loss was least when the base oils were doped with the blend. This was supported by the PSSI data: 24.22 at 1% concentration in BO1 and 11.82 at 3% concentration in BO2.
Asian Journal of Nanoscience and Materials
Sami Publishing Company
2645-775X
4
v.
2
no.
2021
147
158
https://www.ajnanomat.com/article_128494_558c7bb72e6c3787ba12dd5c57c6ed13.pdf
dx.doi.org/10.26655/AJNANOMAT.2021.2.5
Multifunctional additive properties of acrylate based ZnO Nano composite for lubricating oil
Koushik
Dey
Department of Chemistry, University of North Bengal, District-Darjeeling-734013, India
author
Sujan
Paul
Department of Chemistry, University of North Bengal, District-Darjeeling-734013, India
author
Pranab
Ghosh
Department of Chemistry, University of North Bengal, District-Darjeeling-734013, India
author
text
article
2021
eng
Recently, polymer nanocomposites have attracted greater interest as lubricant additives compared to pure polymer. In this work, we synthesized ZnO nanoparticles and characterized them using scanning electron microscope(SEM) and X-ray diffraction (XRD) analysis. The synthesized nanoparticles were then incorporated into the poly dodecylacylate to prepare polymer nanocomposites (PNCs) by sonication. The PNC was characterized using different analytical techniques like FT-IR, NMR, TGA etc. The additive performance of the PNC as viscosity index improver, pour point depressant and anti-wear were evaluated using the standard ASTM methods. The results demonstrated that, the overall performance of the additive was improved byincreasing the concentration of PNC in the base stock. It was observed that PNCs have shown good viscosity modifier characteristics as one of the composite having higher nanoparticles content shown viscosity index value of 137, which is higher than neat polymer. Moreover, up to 28% decrease in wear reduction was observed by applying the PNC.
Asian Journal of Nanoscience and Materials
Sami Publishing Company
2645-775X
4
v.
2
no.
2021
159
170
https://www.ajnanomat.com/article_128611_2395b0e8a250f952e215dd8fb4967095.pdf
dx.doi.org/10.26655/AJNANOMAT.2021.2.6
Synthesis of 2-amino-4H-pyran derivatives in aqueous media with nano-SnO2 as recyclable catalyst
Bita
Baghernejad
Department of Chemistry, Payame Noor University, PO BOX 19395-4697 Tehran, Iran
author
Mahsa
Fiuzat
Department of Chemistry, Payame Noor University, PO BOX 19395-4697 Tehran, Iran
author
text
article
2021
eng
A nano-SnO2 catalyzed environmentally benign strategy for the synthesis of 2-amino-4H-pyran derivatives via the multi-component reaction between aryl aldehydes, β-dicarbonyl compounds and malononitrile in aqueous media under reflux conditions in excellent yields is established. The structures of the synthesized compounds were confirmed using IR, 1H-NMR. The elemental analysis and morphology of the catalyst was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). This one-pot three component protocol provides an efficient improved pathway for the synthesis of pyrans in the terms of short reaction times, simple working up procedure and recyclability of catalyst.
Asian Journal of Nanoscience and Materials
Sami Publishing Company
2645-775X
4
v.
2
no.
2021
171
177
https://www.ajnanomat.com/article_129071_fa76476f3b9ddb36ead409f3badd0d9f.pdf
dx.doi.org/10.26655/AJNANOMAT.2021.2.7