Papers by Mohamed El-Fahham
Materials Chemistry and Physics, 2018
Graphite is a crystalline form of carbon which has attracted the academic and industrial interest... more Graphite is a crystalline form of carbon which has attracted the academic and industrial interest. It has been used as reinforcing filler that can produce highly effective improvement for rubber. This article presents and discusses the development of graphite-based rubber composites and their applications in industries which have been used extensively as reinforcing fillers. Increasing reinforcement of the rubber material leads to an increase in stiffness, modulus, tear strength, cracking resistance, tensile strength, abrasion resistance, and fatigue resistance. Laser-Induced Breakdown Spectroscopy (LIBS) technique has been utilized for determination of hardness and analysis of rubber polymers doped with Graphite filler. Different samples of natural rubber with different graphite filler concentration have been measured. A linear relationship between sample hardness and filler concentration is shown by the conventional hardness measurement techniques and has been demonstrated by LIBS technique too. Other laser-induced plasma parameters such as the electronic density and temperature as a function of time are determined. The same selectivity and ability to excite emission were revealed through measurements using LIBS, and thus the qualitative analysis capability of other techniques was confirmed.
Facile synthesis of Cu2O nanoparticles using pulsed laser ablation method for optoelectronic applications
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2021
Journal of Molecular Structure, 2019
Unmanned aerial vehicle (UAV) manufacturing materials: Synthesis, spectroscopic characterization ... more Unmanned aerial vehicle (UAV) manufacturing materials: Synthesis, spectroscopic characterization and dynamic mechanical analysis (DMA),
OPTICAL PROPERTIES of PMMA / DYE COMPOSITE IRRADIATED with LASER
The effect of reaction temperature on structural, optical and electrical properties of tunable ZnO nanoparticles synthesized by hydrothermal method
Journal of Physics and Chemistry of Solids, 2021
Abstract ZnO nanoparticles of different particle sizes were synthesized via the hydrothermal meth... more Abstract ZnO nanoparticles of different particle sizes were synthesized via the hydrothermal method by varying the autoclave reaction temperature from 100°C to 200°C. The shape and particle size of the produced ZnO nanoparticles were investigated by X-ray diffraction (XRD), UV-visible spectrophotometer, scanning electron microscopy (SEM), transmission electron microscope (TEM), and laser-induced breakdown spectroscopy technique (LIBS). These studies showed that the prepared samples had high purity crystalline structure with wurtzite hexagonal ZnO and its crystallinity increases as the reaction temperature increases. Its absorption spectrum showed that the maximum absorption intensity was shifted to a higher wavelength, followed by increasing their particle sizes as the reaction temperature increases. Its morphological images showed increases in roughness and decreases in particle sizes as the reaction temperature increases. The intensity of the characteristic Zn peak of LIBS spectrum was decreased due to increasing of their particle size as the reaction temperature increases. Finally, the dielectric behavior of the prepared samples was studied revealing the dependence on their particle sizes.
Proceedings of International Structural Engineering and Construction
Value engineering (VE) is a practical approach for economic saving and enhancing quality, thereby... more Value engineering (VE) is a practical approach for economic saving and enhancing quality, thereby increasing sustainability in the construction industry. This study presents a latent correlation between VE and sustainability in the construction industry. Such correlation is an adapted method from the current VE process that analyzes the effects of sustainability factors on alternative local building materials cost/performance through its lifecycle stages. The model enables the study team to apply the methodology during the briefing process and change their thoughts from the only cost to value. The paper also suggests three stages for applying a correlation study within the early stages of a project. The study modified each stage by considering the sustainability factors. The methodology was synthesized based on a review of previous studies reinforced by an electronic survey. This paper presents the model’s application in an apartment project’s case study. This case study presents th...
Mechanical hardness estimation of heat-treated DIN50Cr3 spring steel utilizing laser-induced breakdown spectroscopy (LIBS) inverse calibration
Applied Physics A
Abstract In various industrial applications, particularly for suspension systems, a range of mech... more Abstract In various industrial applications, particularly for suspension systems, a range of mechanical properties are required to meet the designer requirements. In the present work, the semi-nondestructive laser-induced breakdown spectroscopy (LIBS) technique was used for the first time to estimate the hardness (HV units) of the light duty low-carbon spring steel DIN50Cr3 through LIBS calibration curves. For this purpose, three distinct spring steel samples, namely DIN50Cr3 were successfully treated by subjecting to various treatment regimes, namely R1 annealing, R2 quenching and R3 normalizing. The calibration curves were constructed using the ratio of ionic to atomic line intensities of LIBS spectra versus the Vickers mechanical hardness as well as microstructural analyses were performed. The mechanical hardness for spring steel DIN50Cr3 subjected to different tempering heat treatment regimes R4, R5 and R6 is then deduced from the calibration curves, and their values were correlated with those obtained from Vickers test. Microstructural analysis was performed using scanning electron microscopy (SEM) and correlated the variation of the obtained hardness level to the microstructural changes accompanying all heat treatment regimes. Graphic abstract
OPTICAL PROPERTIES of PMMA / DYE COMPOSITE IRRADIATED with LASER
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Papers by Mohamed El-Fahham