Publications by authors named "Ahmed Yagoub Elnour"
Article Synopsis
- There is a growing interest in long afterglow composites for applications in nighttime signals, sensors, and biomedical fields, prompting a study on Polypropylene (PP) composites with strontium aluminate fillers.
- The composites exhibited distinct auto-glowing properties, emitting green and blue light after UV excitation, with phosphorescence intensity and decay linked to the amount of filler used.
- Analysis showed that the fillers affected the crystallinity and thermal stability of the composites, but also reduced their tensile strength and modulus, particularly when larger filler sizes were incorporated.
Article Synopsis
- Researchers developed auto-glowing composites using HDPE combined with strontium aluminate and studied their phosphorescence, observing green and blue emissions when excited with UV light.
- The crystallinity of the composites decreased with the addition of bulky AG fillers, but their melting and crystallization temperatures remained stable, indicating no chemical changes during processing.
- Improvements in tensile strength, viscosity, and filler dispersion were noted in the composites, although prolonged exposure to harsh conditions led to a decrease in phosphorescent intensity and increased brittleness.
Previously, we reported that amorphous poly(ethylene terephthalate) (PET) filled with irregular nodular aluminium (Al) particles gave simultaneous increases in tensile modulus, tensile strength, and impact resistance, which is unusual for materials. Here, we investigated the effect of the particle shape and size by using nano-platelet Al. The Al nano-platelets had a thickness higher than graphenes and clays, but lower than mica and talc, and due to their large widths, they had high aspect ratios.
View Article and Find Full Text PDFA tremendous potential has been observed in the designing of long afterglow materials for sensing, bioimaging, and encryption applications. In this study, two different strontium aluminate-based luminescent materials; SrAlO: Eu, Dy (S), and SrAlO: Eu, Dy (S) were melt-mixed with polypropylene (PP) matrix, and the phosphorescence properties were evaluated. After excitation at 320 nm, the PP/S composite exhibited a green emission and the PP/S generated a blue emission at 520 nm and 495 nm, respectively.
View Article and Find Full Text PDFMetal-plastic composites have the potential to combine enhanced electrical and thermal conductivity with a lower density than a pure metal. The drawback has often been brittleness and low impact resistance caused by weak adhesion between the metal filler and the plastic. Based on our observation that aluminum foil sticks very strongly to poly(ethylene terephthalate) (PET) if it is used as a backing during compression moulding, this work set out to explore PET filled with a micro and a nano aluminum (Al) powder.
View Article and Find Full Text PDFThe application of biochar (BC) as a filler in polymers can be viewed as a sustainable approach that incorporates pyrolysed waste based value-added material and simultaneously mitigate bio-waste in a smart way. The overarching aim of this work was to investigate the electrical, mechanical, thermal and rheological properties of biocomposite developed by utilizing date palm waste-derived BC for the reinforcing of polypropylene (PP) matrix. Date palm waste derived BC prepared at (700 and 900°C) were blended at different proportions with polypropylene and the resultant composites (BC/PP) were characterized using an array of techniques (scanning electron microscope, energy-dispersive X-ray spectroscopy and Fourier transform infra-red spectroscopy).
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