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14. Characterisation of the pulsed-laser induced phase transformation and osteogenic properties of photo-active iron-calcium phosphate biomineral

Author

Alsubhe, Emaan Hamad, Jha, Animesh, and Raif, El Mostafa

Subjects
610.28
Abstract

Personalised medicine and near patient manufacturing are two emerging concepts in tissue engineering. They are based on the design and manufacture of individual bone grafts which are dependent on the needs of individual patients. To date, the most efficient method to achieve this is through selective laser sintering (SLS), which has been one of the most developed and successfully applied techniques [2]. Various forms of calcium phosphates (CaP) have been used so far for scaffold manufacturing through SLS because of their compositional and structural similarity with the mineral within human bone and teeth. The main drawback of bone and tissue-like materials has been the lack of vascularisation which limits blood supply to essential healing areas. Recently there has been an increasing interest in Fe2+\Fe3+ doped calcium phosphates due to the essential function of iron in regulating oxygen through hemoglobin in human body [3]. In addition, it was reported that doping brushite (CaHPO4.2H2O) with Fe2+/Fe3+ ions, improved energy absorption and controlled the volume of energy absorbed region [4]. The Incorporation of Fe within CaP’s lattice resulted in the characteristic thermal phase transformation temperatures to shift to lower values, thereby promoting densification and sintering. The aim of the present work is to identify an optimum doping concentration of sintered β-CPP (Ca2P2O7) doped with Fe ions. The mechanical properties, biological response and the scaffold fabrication potential in relation to laser-matter interaction will be fully investigated. Various concentrations of iron (0 mol%, 5 mol%, 10 mol%, 20 mol% and 30 mol% by substituting ca2+) doped brushite powder were synthesised and sintered at temperature of 1000oC for 5hrs. A femtosecond pulse laser emitting at a wavelength of 800 nm with 1 KHz repetition rate was used to create micro-channels in the surface of the samples to investigate the effect of surface properties in cell behaviour.

Published
2019

15. Isotherm and kinetics study of Ni(II) ions adsorption from wastewater using carbon nanotubes decorated with ZnO nanoparticles.

Author

Elsharkawy, Wafaa B., Mwafy, Eman A., Alghamdi, Shoug M., Alsubhe, Emaan, Albeydani, Ohood, Mostafa, Ayman M., Toghan, Arafat, and Rezk, Reham A.

Abstract

A zinc oxide/carbon nanotube hybrid (ZnO/MWCNT) was synthesized utilizing a straightforward precipitation technique based on the physical approach of pulsed laser ablation. Various techniques were employed to investigate the composition, morphology and optical of the synthesized nanocomposite. The techniques employed were X-ray diffraction, Raman spectroscopy, transmission electron microscopy, FT-IR and thermal gravimetric analysis (TGA) to confirm the compete decoration to be applicable for removal Ni(II) ions in an aqueous solution. ZnO have a hexagonal wurtzite structure connected to hexagonal graphite of MWCNT from XRD. The interaction between ZnO and CNTs resulted in a reduction in the domain of sp2 bonds, according to Raman. From TGA, we can attribute the reduction in thermal analysis to the oxidation of surface hydroxyl functional groups (-OH), the evaporation of surface solvent and the presence of ZnO's inorganic oxide structure compared to pristine MWCNT. These findings confirmed that adding ZnO NPs to MWCNT caused more structural flaws and surface disorder, even though the structure of the CNTs stayed the same. We then investigated numerous factors affecting the extraction of Ni(II) ions, including pH, duration of extraction, amount of nanosorbent used and circumstances. We observed the optimal conditions at room temperature, pH of 5.9, nanoadsorbent dosage of 0.2 g/L and contact time of 1 h. Atomic absorption spectrometry easily monitored the kinetics of this reaction. The Langmuir, Freundlich and Redlich–Peterson isotherm models explain the mechanism underlying the adsorption equilibrium isotherm. Furthermore, regeneration experiments revealed that the adsorbent still maintained a high adsorption capacity after six cycles, demonstrating remarkable potential for use in environmentally friendly applications. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Efficiency Improvement of Lead‐Free La2NiMnO6‐Based Double Perovskite Solar Cells Using Numerical Simulation.

Author

Rehman, Ubaid ur, Almufarij, Rasmiah S., Sahar, Kashaf ul, Ashfaq, Arslan, Saad H.‐E., M. Musa, Alsubhe, Emaan, Albeydani, Ohood, Alghamdi, Shoug M., Mahmood, Khalid, and Wang, Chun‐Ming

Subjects
SOLAR cells, PHOTOVOLTAIC power systems, PEROVSKITE, OPEN-circuit voltage, COMPUTER simulation, SHORT-circuit currents
Abstract

In this work, the efficiency of lead‐free La2NiMnO6 (LNMO)‐based double perovskite solar cells is optimized using solar cell capacitance simulator (SCAPS‐1D). Herein, the device performance is boosted by using different combinations of electron‐transport layers, hole‐transport layers, absorber layer thickness, acceptor doping density, acceptor defect density, and bandgap tuning, and by modifying the electron affinity. To make the device more realistic, the performance of the proposed device is carefully modified in the presence of interface defect density ≈10−13 cm−3, series resistance ≈1 Ω cm2, and shunt resistance ≈6000 Ω cm2, respectively. From the findings, the optimized device exhibits a record open‐circuit voltage = 1.23 V, short‐circuit current density = 27.18 mA cm−2, fill factor = 87.14%, and power conversion efficiency = 29.20% for FTO/SnO2/LNMO/MoO3/Au configuration. Finally, the device performance is tested under different working temperatures, and 300 K is found as the best temperature for the device. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Efficiency Improvement of Lead‐Free La2NiMnO6‐Based Double Perovskite Solar Cells Using Numerical Simulation

Author

Rehman, Ubaid ur, Almufarij, Rasmiah S., Sahar, Kashaf ul, Ashfaq, Arslan, Saad H.‐E., M. Musa, Alsubhe, Emaan, Albeydani, Ohood, Alghamdi, Shoug M., Mahmood, Khalid, and Wang, Chun‐Ming

Abstract

In this work, the efficiency of lead‐free La2NiMnO6(LNMO)‐based double perovskite solar cells is optimized using solar cell capacitance simulator (SCAPS‐1D). Herein, the device performance is boosted by using different combinations of electron‐transport layers, hole‐transport layers, absorber layer thickness, acceptor doping density, acceptor defect density, and bandgap tuning, and by modifying the electron affinity. To make the device more realistic, the performance of the proposed device is carefully modified in the presence of interface defect density ≈10−13cm−3, series resistance ≈1 Ω cm2, and shunt resistance ≈6000 Ω cm2, respectively. From the findings, the optimized device exhibits a record open‐circuit voltage = 1.23 V, short‐circuit current density = 27.18 mA cm−2, fill factor = 87.14%, and power conversion efficiency = 29.20% for FTO/SnO2/LNMO/MoO3/Au configuration. Finally, the device performance is tested under different working temperatures, and 300 K is found as the best temperature for the device. The utilization of Li2NiMnO6, as a lead material in perovskite solar cells, marks a significant development in advancing ecofriendly energy solutions. This breakthrough not only enhances the efficiency of cells but also aligns with the goals for sustainable energy making a valuable contribution, to environmentally conscious technology.

Published
2024
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