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Microstructure and properties of the Nd2Fe14Bp/Al–Co composites fabricated via microwave sintering

Publication date: January–February 2021

Source: Journal of Materials Research and Technology, Volume 10

Author(s): G.R. Li, J.J. Chen, D. Zhang, H.M. Wang, M. Liu, F. Tang, Y.W. Yan, H.R. Wen, W.X. Ren, C.W. Wang

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This study aimed to fabricate a new type of aluminum matrix composite exhibiting high strength, good magnetic property, and toughness to solve the issues on current magnetic materials, such as brittleness and high density. In this paper, the Nd2Fe14Bp/Al–Co composites with different cobalt (Co) contents (wt.%) are fabricated via microwave sintering. The effects of the Co content on the composite microstructures and properties are studied. The results indicate that at a 580 °C sintering temperature, 30 min sintering time, and 30 °C/min heating rate, with an increase in the Co content (0 → 1%→2.5%→5%→7.5%→10%), the compactness initially increases and then decreases and reaches the maximum of 94.5% for the 5%Co sample together with a smaller grain size. The composites mainly consist of Nd2Fe14B with various sizes, Co particles, and the Nd2(Fe,Co)14B phase. The interfacial deformation resistance of the 5%Co sample tested via nanoindention is 22.8% higher than that of the Co-free sample, which can facilitate in the interfacial strengthening. The microhardness, yield strength, and tensile strength of the 5%Co samples are 107.4 HV, 210.84 MPa, and 139.8 MPa, respectively. The remanence Br, coercive force Hcj, and maximum magnetic energy product (BH)max of the 5%Co sample are 0.37 T, 0.65 T, and 45.12 kJ/m3, respectively, which are 48.6%, 29.2%, and 63.9% higher than those of the Co-free sample. The significant increase in the magnetic properties is mainly attributed to the interactive coupling between the Co particle soft magnetic phase and Nd2Fe14B hard magnetic phase.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420320512?dgcid=rss_sd_all

Material

Synthesis and optical properties of alizarin yellow GG-Cu(II)-PVA nanocomposite film as a selective filter for optical applications

Publication date: Available online 4 January 2021

Source: Journal of Materials Research and Technology

Author(s): Mona M. Khalil, Adly H. El-Sayed, M.S. Masoud, E.M. Mahmoud, Mahmoud A. Hamad

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Elsevier

Available online 4 January 2021

Journal of Materials Research and Technology

open access

Abstract

In this paper, alizarin yellow GG (AYGG) – CuCl2 doped with polyvinyl alcohol (PVA) has been successfully synthesized. This composite has spherical shape particles with amorphous structure. Thermal analysis indicates that there is an endothermic change, which is related to the glass transition. In addition, the coordination between the transition metal Cu(II) ion and AYGG (ligand) occurs via oxygen atoms of phenolic hydroxyl groups and a nitrogen atom of azo moiety from the two ligand molecules. AYGG – Cu(II) doped PVA has high dispersion for high frequency lights and vice versa for low frequency lights. Therefore, it is concluded that AYGG – Cu(II) doped PVA film is suggested as a selective filter for ultraviolet and high frequency visible lights for many optical applications like protective shields for solar cells and packaging.

Keywords

Alizarin yellow GG

UV-Vis spectra

FTIR spectra

refractive index

© 2021 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420321815?dgcid=rss_sd_all

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Material

Factors affecting the formation of plasma on Fe, Cu and W electrodes using an electrochemical reaction in an aqueous environment with high-voltage DC

Publication date: Available online 5 January 2021

Source: Journal of Materials Research and Technology

Author(s): Tran Van Cong, Nguyen Duc Hung, Lai Xuan Bach, Tran van Hung, Nam Nguyen Dang

Republished by Plato

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Elsevier

Available online 5 January 2021

Journal of Materials Research and Technology

open access

Highlights

Formation of plasma on Fe, Cu and W electrodes using electrochemical reaction in aqueous environment.

Plasma appears at a high voltage of about 15 kV with the earliest appearance on W electrode.

Water-soluble plasma on W electrode produces more gases than those in Fe and Cu electrodes.

The size of Cu and Fe nanoparticles is approximate 200 nm, whereas 100 and 500 nm were for W.

Abstract

Plasma creation technology in an aqueous environment is being evaluated for research and practical applications, particularly in the field of materials and nano processing, as well as environmental pollution treatment. Important factors that influence the appearance of plasma when performing electrolysis by high-voltage DC (direct current) in aqueous environments are voltage, distance between electrodes, pH, conductivity and ambient temperature, as well as the nature of the electrode, which has been suggested by concurrent works to be the controlling factor of the other ones. Specifically, it is indicated that the plasma typically appears at a high voltage of about 15 kV and a distance between electrodes of 200 mm, with the earliest appearance occurring with the tungsten (W) electrode. Additionally, pH, conductivity and temperature variations for effective plasma creation have been found in all investigated electrodes. Finally, it has been found that the water-soluble plasma on the W electrode produces more gas than those in iron (Fe) and copper (Cu) electrodes. After the reactions, the lowest dissolution belonging to W electrode could be attributed to the inertness of W in comparison with Fe and Cu, resulting in a minimal value of the zeta potential. In addition, the size of Cu and Fe nanoparticles achieved in the investigated solution was approximately 200 nm, whereas W nanoparticles were two separate sizes of 100 and 500 nm. Therefore, this work could offer the needed agency for technological applications in industrial wastewater treatment and high-purity nanoparticle fabrication.

Keywords

Plasma electrode

Copper

Iron

Tungsten

High voltage electrochemistry

© 2021 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420321748?dgcid=rss_sd_all

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Material

Selenium nanoparticles synthesized using an eco-friendly method: Dye decolorization from aqueous solutions, cell viability, antioxidant, and antibacterial effectiveness

Publication date: Available online 5 January 2021

Source: Journal of Materials Research and Technology

Author(s): Badreah A. Al Jahdaly, Najlaa S. Al-Radadi, Ghada M.G. Eldin, Albandary Almahri, M.K. Ahmed, Kamel Shoueir, Izabela Janowska

Republished by Plato

Published

on


Elsevier

Available online 5 January 2021

Journal of Materials Research and Technology

open access

Abstract

Selenium nanoparticles (SeNPs) were fabricated using a green microwave technique in the presence of ascorbic acid. The morphological features indicated that the semi-spherical SeNPs with a diameter 8.5-22nm were configured in agglomerated spherical shapes with diameters around 0.47-0.71 μm. Furthermore, the removal of Fuchsin Basic dye from aqueous solutions was investigated upon variation of concentration of SeNPs. The degradation efficiency achieved 100 % for 10 mg of SeNPs after 34 min of visible light irradiation time. The antioxidant activity was tested via DPPH radical scavenging assay and displayed that the highest scavenging capacity (311.1±15.72 mg/g) was achieved by SeNPs at a concentration of 106.25 mg/mL. Otherwise, the cell viability of SeNPs through human fibroblasts cell lines in-vitro was reduced to be 75.1±3.8 % with nanoparticle concentration around 500 μg/mL. The antibacterial activity was investigated against gram-negative and gram-positive bacteria such as Escherichia coli (E.coli), Pseudomonas aeruginosa (P. aeruginosa), Klebsiella pneumoniae (K. pneumonia), Staphylococcus aureus (S. aureus), and Bacillus subtilis (B. subtilis) bacteria after one day of exposure. It was illustrated that SeNPs did not display an activity towards Staphylococcus aureus, while it possessed the highest one against Escherichia coli with MBC of 50 ± 1.76 μg/mL compared with 26 ± 0.6 μg/mL for the standard antibiotic. These tremendous properties of SeNPs indicate that manipulating multifunctional nanoparticles for versatile wound and skin treatment applications is highly encouraging.

Keywords

SeNPs

ascorbic acid

dye removal

antibacterial

antioxidant

© 2020 Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420321761?dgcid=rss_sd_all

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