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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

Republished by Plato

Published

on


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

Material

Solar Light Irradiated Photocatalytic Activity of ZnO-NiO/rGO Nanocatalyst

Publication date: Available online 6 March 2021

Source: Journal of Materials Research and Technology

Author(s): Sheraz Yousaf, Sonia Zulfiqar, Muhammad Imran Din, Philips O. Agboola, Mohamed F. Aly Aboud, Muhammad Farooq Warsi, Imran Shakir

Republished by Plato

Published

on


Elsevier

Available online 6 March 2021

Journal of Materials Research and Technology

open access

Abstract

The current study is based on the synthesis and characterization of ZnO-NiO/rGO nanohybrid for photocatalytic degradation of organic pollutants. The physicochemical properties of synthesized products were estimated by x-rays diffraction technique (XRD), Fourier transforms infrared spectroscopy (FTIR), field emission-scanning electron microscopy (FE-SEM), and ultraviolet-Visible spectroscopy. The diffraction data showed the formation of binary metal oxide nanocomposite, containing ZnO in hexagonal whereas NiO in the cubic crystalline phase. XRD results revealed that the calculated crystallite size of NiO and ZnO in the ZnO-NiO nanocomposite was < 20 nm. The spectroscopic results were found in close agreement with XRD data. The morphological analysis exposed the nano-island morphology of the product. The solar light assisted photocatalytic degradation outcomes showed 89% degradation of methylene blue and 51% degradation of benzimidazole under similar conditions using ZnO-NiO/rGO nanohybrid. Moreover, the active species experiment showed that hydroxyl radicals, electrons, and holes were the main active species during the degradation mechanism. In contrast to the ZnO-NiO nanocomposite, the ZnO-NiO/rGO nanohybrid exhibited greater degradation efficiency. This superb photocatalytic performance of ZnO-NiO/rGO nanohybrid proved to be a durable candidate in the field of catalysis.

Keywords

Solar Light Irradiation

Photocatalyst

rGO

Nanohybrid

Degradation Efficiency

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

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Source: https://www.sciencedirect.com/science/article/pii/S2238785421002386?dgcid=rss_sd_all

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Material

Fracture prediction of powder metallurgical Fe-Cu-C steel at elevated temperatures via finite element-aided hot tensile tests

Publication date: Available online 5 March 2021

Source: Journal of Materials Research and Technology

Author(s): Qiang Li, Biao Guo, Xiao Li, Yu Zhang, Jie Jian, Jinqing Ao, Qifeng Tang, Yun Lu

Republished by Plato

Published

on

Elsevier

Available online 5 March 2021

Journal of Materials Research and Technology

open access

Abstract

Surface cracking induced by damage accumulation is a common quality problem during the hot processing of powder metallurgical (P/M) products. This study aims to clarify the damage and fracture of P/M Fe-Cu-C steel at elevated temperatures to propose its fracture criterion by combining hot tensile tests with finite element (FE) calculations. The results reveal that the FE-aided test accurately corrected the true stress and strain of the P/M steel during the Gleeble hot tensile testing. In addition, the flow behaviors and cracking tendency of the P/M steel strongly depended on the hot deformation parameters. The optimum hot processing window of P/M steel was proposed after determining the quantitative relationships between the damage and hot deformation parameters. Finally, a novel elevated temperature fracture strain model of the P/M steel was proposed based on the Zener–Hollomon parameter to construct its Cockroft and Latham fracture criterion coupling hot processing parameters. The constructed fracture criterion was further normalized and modified, and achieved an acceptable fracture predictive capability with a relative error of less than 5 %, which was validated by powder forging experiments. This work provides essential information and a useful model for the fracture prediction of P/M Fe-Cu-C steel at elevated temperatures, helping to manage the surface cracking problems of P/M steel during hot processing.

Keywords

powder metallurgy

hot processing

finite element-aided test

hot tensile

fracture prediction

© 2021 Published by Elsevier B.V.

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Source: https://www.sciencedirect.com/science/article/pii/S2238785421002349?dgcid=rss_sd_all

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Material

Microstructural study of the nano-scale martensitic lamellar α-Co and ε-Co phases of a Co-Cr alloy fabricated by selective laser melting

Publication date: Available online 6 March 2021

Source: Journal of Materials Research and Technology

Author(s): Hyung Giun Kim, Won Rae Kim, Hyun Woong Park, Gyung Bae Bang, Kyung-Hwan Jung, Yong Son, Sung Hwan Lim

Republished by Plato

Published

on

Elsevier

Available online 6 March 2021

Journal of Materials Research and Technology

open access

Abstract

An interfacial microstructural study was carried out to clarify the hardening mechanism of an as-built Co-Cr alloy fabricated by selective laser melting (SLM). Using transmission electron microscopy, we found a unique martensitic lamellar microstructure with a specific orientation relationship between the α-Co and ε-Co phases; specifically, a nanoscale microstructure consisting of (111)α-Co//(000

2¯

)ε-Co and [0

1¯

1]α-Co//[

1¯

2

1¯

0]ε-Co was formed on the Co-Cr alloy. The Co-Cr alloy fabricated by SLM with a martensitic microstructure achieved a Vickers hardness value of approximately 369.36 ± 11.86 HV without any secondary-phase particles such as carbides.

Keywords

Co-Cr alloy

Selective laser melting

Microstructure

Transmission electron microscopy

Orientation relationship

© 2021 Published by Elsevier B.V.

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Source: https://www.sciencedirect.com/science/article/pii/S2238785421002325?dgcid=rss_sd_all

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