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Material

Synthesis of silica-based scaffolds with high porosity and controllable microstructure by a sintering-free sol–gel/freeze-casting hybrid method under mild conditions

Publication date: November–December 2020

Source: Journal of Materials Research and Technology, Volume 9, Issue 6

Author(s): Haw-Kai Chang, Po-Yu Chen

Republished by Plato

Published

on

open access

Abstract

Scaffolds and porous composites synthesized by freeze casting method and polymer infiltration can be applied in the fields of bone grafting materials, implants, filtration, and thermal insulation due to the anisotropic and interconnected porous structure. Freeze casting techniques have been applied to synthesize a wide variety of scaffolds with aligned channels. Typical freeze casting method requires sintering as-casted scaffolds at high temperature which limits the materials selection and its applicability. In this study, a novel sintering-free sol–gel/freeze-casting hybrid method is established. The as-synthesized gel can be shaped by mold more easily compared to powder by the novel mold assisted melting method. This pioneering method surpassed the limitation of freeze-drying under low pressure and temperature, facilitating controllable reaction under mild condition. Another important advantage is that the sintering process at a high temperature is no longer required which broadens the materials selection and potential applications. Besides, microstructural features can be controlled by tuning the water content in the gel and the cooling rate. Moreover, composite scaffolds with high porosity (>90%) and proper mechanical stability are synthesized by mixing gel and polymer. The bio-inspired scaffolds and composites fabricated by this novel sintering-free sol–gel/freeze-casting hybrid method possess advantages and great potentials in various applications.

Keywords

Freeze casting

Sol–gel

Anisotropic

Mechanical property

Composites

© 2020 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420320238?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

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

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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

Published

on


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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