articles by Hesham Tantawy
Comparison of electromagnetic shielding with polyaniline nanopowders produced in solvent-limited conditions
Chemical effects of a solvent-limited approach to hcl-doped polyaniline nanopowder synthesis
X-ray photoelectron spectroscopy analysis for the chemical impact of solvent addition rate on electromagnetic shielding effectiveness of HCl-doped polyaniline nanopowders
Elaboration of nano titania-magnetic reduced graphene oxide for degradation of tartrazine dye in aqueous solution
Infrared Signature of Novel Super-Thermite (Fe<inf>2</inf>O<inf>3</inf>/Mg) Fluorocarbon Nanocomposite for Effective Countermeasures of Infrared Seekers
Super-Thermite (Al/Fe<inf>2</inf>O<inf>3</inf>) Fluorocarbon Nanocomposite with Stimulated Infrared Thermal Signature via Extended Primary Combustion Zones for Effective Countermeasures of Infrared Seekers
Enhancing the explosive characteristics of a Semtex explosive by involving admixtures of BCHMX and HMX
Novel colored flames via chromaticity of essential colors
A new cationic silver(I)/melamine coordination polymer, [Ag <inf>2</inf> (melamine)] <inf>n</inf>2n+ : Synthesis, characterization and potential use for aqueous contaminant anion exchange
Infrared Spectra of Customized Magnesium/Teflon/Viton Decoy Flares
Papers by Hesham Tantawy
Research Square (Research Square), Feb 15, 2021
Oxygen atoms on the surface of oxide catalysts have low coordination number; they are negatively ... more Oxygen atoms on the surface of oxide catalysts have low coordination number; they are negatively charged. Surface oxygen can act active sites for decomposition of energetic nitramines (i.e. HMX); additionally hydrous surface can release active ȮH radicals. Colloidal oxide particles can fulfil these requirements. Furthermore oxide particles can induce thermite reaction with aluminium particles. This study reports on the facile fabrication of colloidal ferric oxide particles of 5 nm; Colloidal Fe 2 O 3 /Al binary mixture was integrated into HMX matrix via co-precipitation technique; uniform dispersion of nanothermite particles was verified using SEM. Naonothermite particles experienced dramatic change in HMX thermal behaviour with an increase in total heat release by 63 %. The impact of themrite particles on HMX kinetic decomposition was evaluated using an integral isoconversional method of KAS, and Kissinger models. The mean value of apparent activation was reduced by 23.5 % and 24.3 % using Kissinger and KAS models respectively. This dramatic change in HMX decomposition can be ascribed to the ferric oxide reactivity and the facile integration of colloidal thermite particles.
Optimization of mechanical and electromagnetic interference shielding properties of expanded graphite/polyurethane composite foams
SPE polymers, Mar 23, 2024
Journal of Inorganic and Organometallic Polymers and Materials, May 4, 2021
Oxygen atoms on the surface of oxide catalysts have low coordination number; they are negatively ... more Oxygen atoms on the surface of oxide catalysts have low coordination number; they are negatively charged. Surface oxygen can act active sites for decomposition of energetic nitramines (i.e. HMX); additionally hydrous surface can release active ȮH radicals. Colloidal oxide particles can fulfil these requirements. Furthermore oxide particles can induce thermite reaction with aluminium particles. This study reports on the facile fabrication of colloidal ferric oxide particles of 5 nm; Colloidal Fe 2 O 3 /Al binary mixture was integrated into HMX matrix via co-precipitation technique; uniform dispersion of nanothermite particles was verified using SEM. Naonothermite particles experienced dramatic change in HMX thermal behaviour with an increase in total heat release by 63 %. The impact of themrite particles on HMX kinetic decomposition was evaluated using an integral isoconversional method of KAS, and Kissinger models. The mean value of apparent activation was reduced by 23.5 % and 24.3 % using Kissinger and KAS models respectively. This dramatic change in HMX decomposition can be ascribed to the ferric oxide reactivity and the facile integration of colloidal thermite particles.
Deleted Journal, Mar 23, 2024
Efficient electromagnetic waves absorbing materials while preserving structural integrity based o... more Efficient electromagnetic waves absorbing materials while preserving structural integrity based on MIL-53(Fe)/reduced graphene oxide composites remains a challenging task. Most reported preparation techniques compromise structural integrity which limits its practical applications. This study reports innovative method by carefully controlling pyrolysis in a tubular furnace to produce Pyrolyzed MIL-53(Fe)/reduced graphene oxide (P-MIL-53(Fe)/RGO) composites to safeguard structural integrity while preserving RGO's structure and achieving high EMI shielding efficiency. Various mass ratios of reduced graphene oxide were investigated (15%, 20%, and 30%) to indicate the impact of calcination in changing the degree of graphitization and its effect on the shielding performance. P-MIL-53(Fe)/RGO30 stands out, achieving notable total shielding effectiveness (SE T ) of 46.5 dB and absorption shielding efficiency (SE A ) of 40.3 dB with 2 g of reduced graphene oxide (5 mm thick). The study offers a simple strategy to produce the desired composite with preserved reduced graphene oxide's structural integrity which has a potential EMI shielding performance. These insights hold promise for diverse applications demanding robust, high-performance electromagnetic wave shielding materials. • The developed preparation method yields high-yield P-MIL-53(Fe)/RGO composites. • Pyrolyzed MIL-53(Fe)/RGO composites show high shielding efficiency without compromising structural integrity. • P-MIL-53(Fe)/RGO30 achieves outstanding shielding effectiveness, offering potential in diverse applications.
Journal of Applied Physics, Nov 3, 2015
A Co‐Precipitated α‐Alumina (Al 2 O 3 ) used as a TL‐Micro Dosimeter
Zeitschrift für anorganische und allgemeine Chemie, May 28, 2021
Natural radioactivity levels and radiological implications in the high natural radiation area of Wadi El Reddah, Egypt
Journal of Radioanalytical and Nuclear Chemistry, Jan 25, 2021
Wadi El Reddah, Egypt, is mostly enclosed by scattered exposure to the chronological sequence of ... more Wadi El Reddah, Egypt, is mostly enclosed by scattered exposure to the chronological sequence of a metavolcanic and metagabbro-diorite complex. There are radiological impacts due to internal and external exposure to the high natural background radiation caused by 226Ra, 232Th, and 40K in the Wadi El-Reddah stream sediments. 72 samples were collected and the activity concentration was measured using a NaI(Tl) gamma-spectroscopy system. The average activity concentration of 226Ra, 232Th and 40K was 215 ± 118 Bq kg−1, 131 ± 90 Bq kg−1 and 822 ± 125 Bq kg−1, respectively. Most of the studied samples had a higher activity concentration than the world average.
Journal of physics, Jul 1, 2021
This article investigated the dc electrical properties of Au / PM-355 thin films synthesized usin... more This article investigated the dc electrical properties of Au / PM-355 thin films synthesized using magnetron sputtering. PM-355 specimens were cleaned by ethanol and then were deposited by gold of different thicknesses equal to 300, 400, 500, 700, 1000, 1300, and 1500 nm. From dc electrical measurements as resistance, resistivity and conductivity were investigated for these thin films due to determine the optimum Au thickness with good characteristic. Then, this optimum thickness was treated by annealing in air up to 140 °C for 30 minutes. Hence, another organic cleaner, chloroform, was used before the deposition of optimum thickness forming thin film. Also, study the effect of nitrogen ion beam extracted from conical anode-disc cathode ion source carried out for 30 minutes with operating conditions on the organic cleaners and annealing Au / PM-355 thin films. Moreover, Shore D hardness tester was used to measure micro-hardness for all thin films compared by blank PM-355. Then, the comparison was done between the thin films through dc electrical conductivity and micro-hardness data at the absence and presence of ion beam irradiation. Finally, the change in surface morphology of thin films due to different treatments can be observed by scanning electron microscope.
Low thermal emissivity coating based on aluminium / acrylic composite coatings
IOP Conference Series: Materials Science and Engineering, 2021
Low emissivity coatings were synthesized by using fine flake Aluminium (Al) powder as a filler wi... more Low emissivity coatings were synthesized by using fine flake Aluminium (Al) powder as a filler within acrylic resin to from the desired composite coatings. In the current work, ball milling was applied to prepare Al with different shapes and sizes. The technical parameters of prepared Al powders with respect to the initial raw Al are characterized by scanning electron microscope (SEM), X-Ray diffraction (XRD), and Energy Dispersive X-Ray Analysis (EDX). Moreover, parameters that affect the emissivity of the coating was investigated; such as coating thickness, particle size, spin coating, ball milling time and the content of coated Al powder. The thermal signature is highly affected by the variation in Al content (5%, 20%, 25%, 35%, 40% and 60%) at different temperatures (50°C, 70°C, 90°C). The results indicate that the perfect percentage for the filler (Al) in the matrix within the range (35 wt. - 40 wt. %) and Al fine flake powder particle, which gives the lowest infrared emissivity of 0.385 μm and 0.412 μm for (3-5) μm, (8-12) μm, respectively.
An evaluation of the improved catalytic performance of rGO/GO-hybrid-nanomaterials in photocatalytic degradation and antibacterial activity processes for wastewater treatment: A review
Journal of Molecular Structure, Sep 1, 2023
Uploads
articles by Hesham Tantawy
Papers by Hesham Tantawy