An Investigation into the Potential of Turning Induced Deformation Technique for Developing Porous Magnesium and Mg-SiO2 Nanocomposite

Johanes, Michael; Gupta, Manoj

doi:10.3390/ma16062463

Cited by 3 publications

(3 citation statements)

References 51 publications

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“…The resulting fracture surface was found to be In line with that of other similarly processed Mg materials [23], though with deeper cracks on the fracture surface, which are similar to those found in porous Mg-SiO 2 nanocomposites [35], suggesting a possible link between the presence of these cracks and the relatively high porosity of the Mg-15Se studied.…”

Section: Compressive Propertiessupporting

confidence: 72%

“…This was derived from the observed pore area fraction, which was 2.91%, which equates to the true porosity of the material and that above pure Mg (0.21%). A possible reason for this, apart from the use of Se as an alloying element, is the lower sintering temperature; the material in this work was sintered to just 200 • C (due to concerns of Se melting) compared to the reference material, which was sintered to 640 • C. A higher sintering temperature/duration was previously observed to have resulted in narrower and smaller pores in both Mg and non-Mg materials [35][36][37], likely as a result of more interconnected particles as sintering temperature increases. Another reason for the high porosity of the Mg-Se alloy can be attributed to the partial leaching/melting of selenium during the extrusion step, as indicated in Section 4.2.…”

Section: Density and Porositymentioning

confidence: 97%

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A First-Time Investigation into Ecofriendly and Biocompatible Mg-Se Binary System for a Greener Earth

Johanes,

Sonawane,

Gupta

2024

Metals

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In this study, the Mg-15Se binary system was, for the first time, investigated and synthesized using the powder metallurgy (PM) method, including microwave sintering and hot extrusion. The resulting material was shown to possess visible pores with a porosity of 2.91%, higher than other Mg materials synthesized using this method in the literature. Despite this, the material not only exhibited a comparable corrosion response with pure Mg but also a significantly superior mechanical response (76% greater damping capacity, 57% increase in hardness, and increases of 21%, 50%, and 51% for compressive yield strength, ultimate compressive strength, and fracture strain, respectively). Thus, this not only opens the door for future work concerning the addition of medicinal Se to nutritional Mg element and the optimization of process parameters but also could potentially be making inroads into the biomedical field with the use of selenium as a biomedical-oriented alloying element.

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Section: Compressive Propertiessupporting

confidence: 72%

Section: Density and Porositymentioning

confidence: 97%

A First-Time Investigation into Ecofriendly and Biocompatible Mg-Se Binary System for a Greener Earth

Johanes,

Sonawane,

Gupta

2024

Metals

Self Cite

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“…The porosity of human normal cancellous bone ranges from 50% to 90%, 40,41 and the porosity of four groups of doped hydrogels with varying nanoparticle content falls within this range. Mg-nHA/PVA/CS hydrogels can provide a spatial environment for the repair of cancellous bone that closely resembles the natural conditions found in the human body.…”

Section: Porosity and Densitymentioning

confidence: 96%

Magnesium-Doped Nano-Hydroxyapatite/Polyvinyl Alcohol/Chitosan Composite Hydrogel: Preparation and Characterization

Zhang,

Liu,

Zhao

et al. 2024

IJN

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Background Polyvinyl alcohol/Chitosan hydrogel is often employed as a carrier because it is non-toxic, biodegradable, and has a three-dimensional network structure. Meanwhile, Magnesium-doped nano-hydroxyapatite(Mg-nHA) demonstrated high characterization to promote the osteogenic differentiation of bone marrow derived mesenchymal stem cell(BMSCs). Therefore, in order to develop a porous hydrogel scaffold for the application of bone tissue engineering, an appropriate-type Mg-nHA hydrogel scaffold was developed and evaluated. Methods A composite hydrogel containing magnesium-doped nano-hydroxyapatite (Mg-nHA/PVA/CS) was developed using a magnetic stirring-ion exchange method and cyclic freeze-thaw method design, with polyvinyl alcohol and chitosan as the main components. Fourier transform infrared spectra (FTIR), electron energy dispersive spectroscopy (EDS), X-ray photoelectron spectrometer (XPS) and scanning electron microscopy (SEM) were employed to analyze the chemical structure, porosity, and elemental composition of each hydrogels. The equilibrium swelling degree, moisture content, pH change, potential for biomineralization, biocompatibility, the osteogenic potential and magnesium ion release rate of the composite hydrogel were also evaluated. Results SEM analysis revealed a well-defined 3D spatial structure of micropores in the synthesised hydrogel. FTIR analysis showed that doping nanoparticles had little effect on the hydrogel’s structure and both the 5% Mg-nHA/PVA/CS and 10% Mg-nHA/PVA/CS groups promoted amide bond formation. EDS observation indicated that the new material exhibited favourable biomineralization ability, with optimal performance seen in the 5% Mg-nHA/PVA/CS group. The composite hydrogel not only displayed favourable water content, enhanced biocompatibility, and porosity (similar to human cancellous bone), but also maintained an equilibrium swelling degree and released magnesium ions that created an alkaline environment around it. Additionally, it facilitated the proliferation of bone marrow mesenchymal stem cells and their osteogenic differentiation. Conclusion The Mg-nHA/PVA/CS hydrogel demonstrates significant potential for application in the field of bone repair, making it an excellent composite material for bone tissue engineering.

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An Insight into the Varying Effects of Different Cryogenic Temperatures on the Microstructure and the Thermal and Compressive Response of a Mg/SiO2 Nanocomposite

Johanes,

Mehtabuddin,

Venkatarangan

et al. 2024

Metals

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This study for the first time reports that insights into microstructure and thermal and compressive responses can be best achieved following exposure to different cryogenic temperatures and that the lowest cryogenic temperature may not always produce the best results. In the present study, a Mg-SiO2 biocompatible and environment-friendly nanocomposite was synthesized by using the Disintegrated Melt Deposition method followed by hot extrusion. Subsequently, it was subjected to four different sub-zero temperatures (−20 °C, −50 °C, −80 °C, and −196 °C). The results reveal the best densification at −80 °C, marginally improved ignition resistance at 50 °C, the best damping response at −80 °C, the best microhardness at −50 °C, and the best compressive response at −20 °C. The results clearly indicate that the cryogenic temperature should be carefully chosen depending on the property that needs to be particularly enhanced governed by the principal requirement of the end application.

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An Investigation into the Potential of Turning Induced Deformation Technique for Developing Porous Magnesium and Mg-SiO2 Nanocomposite

Cited by 3 publications

References 51 publications

A First-Time Investigation into Ecofriendly and Biocompatible Mg-Se Binary System for a Greener Earth

A First-Time Investigation into Ecofriendly and Biocompatible Mg-Se Binary System for a Greener Earth

Magnesium-Doped Nano-Hydroxyapatite/Polyvinyl Alcohol/Chitosan Composite Hydrogel: Preparation and Characterization

An Insight into the Varying Effects of Different Cryogenic Temperatures on the Microstructure and the Thermal and Compressive Response of a Mg/SiO2 Nanocomposite

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