Synthesis and structural and mechanical properties of nanobioceramic (α-Al2O3)

Hezil, Naouel; Fellah, Mamoun

doi:10.1007/s41779-019-00333-7

Cited by 30 publications

(7 citation statements)

References 35 publications

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“…The pore structure in the paper primarily consists of a single spherical void located at the 3D geometric center of the model with varying inner radii. The rationale for selecting the spherical shape as the void is based on the observation results from the SEM experimental findings [9,43,44]. By utilizing the most representative void shape, the impact of multiaxial loading on the trends and orientations of crack propagation can be more lucidly investigated under diverse stress states (e.g., strain rates).…”

Section: Methodsmentioning

confidence: 99%

Molecular Dynamics Simulations Correlating Mechanical Property Changes of Alumina with Atomic Voids under Triaxial Tension Loading

2023

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The functionalization of nanoporous ceramics for applications in healthcare and defence necessitates the study of the effects of geometric structures on their fundamental mechanical properties. However, there is a lack of research on their stiffness and fracture strength along diverse directions under multi-axial loading conditions, particularly with the existence of typical voids in the models. In this study, accurate atomic models and corresponding properties were meticulously selected and validated for further investigation. Comparisons were made between typical material geometric and elastic properties with measured results to ensure the reliability of the selected models. The mechanical behavior of nanoporous alumina under multiaxial stretching was explored through molecular dynamics simulations. The results indicated that the stiffness of nanoporous alumina ceramics under uniaxial tension was greater, while the fracture strength was lower compared to that under multiaxial loading. The fracture of nanoporous ceramics under multi-axial stretching, was mainly dominated by void and crack extension, atomic bond fracture, and cracking with different orientations. Furthermore, the effects of increasing strain rates on the void volume fraction were found to be similar across different initial radii. It was also found that the increasing tension loading rates had greater effects on decreasing the fracture strain. These findings provide additional insight into the fracture mechanisms of nanoporous ceramics under complex loading states, which can also contribute to the development of higher-scale models in the future.

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Section: Methodsmentioning

confidence: 99%

Molecular Dynamics Simulations Correlating Mechanical Property Changes of Alumina with Atomic Voids under Triaxial Tension Loading

2023

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“…10b where they indicate the presence of the same absorption peaks mentioned above, but less clear at 466, 553, 740, 840, 1160 cm −1 [30], proportional to the vibrations of the bonds of type O, Al, Si, Zr of various kinds. As for MgO, absorbance peaks appear at 420 cm −1 [22]. What is new is the presence of oscillations on the spectra after the end of the photocatalytic process.…”

Section: Study Of Adsorption By Infrared Spectroscopymentioning

confidence: 95%

“…The higher MgO content in the powder, the greater the shift to the right is observed. This leads to a deformation of the crystal structure due to the expansion of the cell and changes in its dimensions due to the occupation by large Mg atoms (Mg 2+ = 0.72 Å) sites in the ceramic (Al 3+ = 0.5 Å, Si 4+ = 0.40 Å)) [11,22]. As shown in Table 1, the size of the granules increases with the addition of the MgO in case of mullite-cristobalite from 27.2 to 34.5 nm.…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…MgO is one of the semiconductors selected in the study based on its mechanical, electrical, optical and thermal properties that make it a good catalyst for various applications [17][18][19]. Over the past decades, this material has showed great scientific and technological advantages due to its high thermal stability (up to 2900 °C), low wear resistance, dielectric (dielectric constant 9.8) and large impermeable range (Eg = 7.2 V) [20][21][22]. Recent studies have also shown that the size and shape of the magnesium oxide nanoparticles give it a high-quality surface as a reaction catalyst, due to structural defects on the surface.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have also shown that the size and shape of the magnesium oxide nanoparticles give it a high-quality surface as a reaction catalyst, due to structural defects on the surface. It is suitable for water decomposition and hydrogen production [16,19,22]. MgO is also used for special wideranging biological roles including groundwater, wastewater, drinking water, air emissions and toxic waste treatment, as well as potentially as an antimicrobial agent [16,21,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High photocatalytic capacity of porous ceramic-based powder doped with MgO

Bouras

Fellah

Mecif

et al. 2022

J. Korean Ceram. Soc.

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To purify water at low cost for our daily life, the effect of ceramic-based (mullite–cristobalite) and (mullite–zircon) powders doped with different amounts of magnesium oxide (MgO) (10 and 20 wt%) was studied. These compounds are made of a local raw material DD3 with addition of zirconia (ZrO2) to create an open porosity. The powders were prepared by the traditional mixing method with the help of an automated crushing. The effect of MgO doping on structural, morphological and photocatalytic properties of the material was studied by various analytical techniques such as X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, infrared, and UV–visible spectrometry. The results of XRD proved that there was a deformation in the crystal structure of the two types of ceramics after addition, which resulted in a shift of the spectra to the right, while SEM proved the presence of pores with a larger size as the proportion of MgO increases. The chemical composition of the basic components of the ceramic compounds as well as the additive was confirmed with EDS and IR spectra. The final results show that ceramics with added zirconia (DD3Z) and doped with 10% of MgO have a better photocatalytic efficiency than ceramics without zirconia. This important effect could be related to the higher rate of porosity, which provides a more active surface. The 10% MgO content showed a high photoactivity of 77.33% in only 15 min. The maximum hydrolysis rate obtained with Orange II was 92.95% after a period of 45 min with DD3Z/MgO powders.

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