Browsing by Author "Ezz-Eldin F.M."

Now showing 1 - 5 of 5

Characterization by optical and magnetic spectroscopy of a synthesized SiO2 thin film used for radiation detector
(Scientific Publishers, 2017) Abdelaziz T.D.; Ezz-Eldin F.M.; October University for Modern Sciences and Arts (MSA University); Faculty of Biotechnology; Basic Sciences Department; 6th October City; Egypt; National Center for Radiation Research and Technology; Atomic Energy Authority; Cairo; Egypt; Chemistry Department; Foundation Academy for Sciences and Technology (FAST); Batterjee Medical College (BMC); Jeddah; Saudi Arabia
This work reports the synthesis and characterization of silica glass prepared by sol�gel procedure and finds out the effects of doses of gamma irradiation on the steps route of the heat-treated sample at 600 and 1100��C. Combined characterizations of the glassy samples have been carried out by optical absorption and electron paramagnetic resonance. Also, FT infrared absorption spectra have been measured for both the heat-treated samples before and after gamma irradiation. Optical absorption spectra have identified an absorption band at 212�215�nm beside a broad band at 230�265�nm and the correlation of E? center with heat-treatment and gamma irradiation have been followed. FT infrared absorption spectra indicate the bands within near IR region representing the vibrational modes due to water, OH and SiOH within the wavenumber range 2500�3700�cm?1 are affected by heat treatment due to the elimination of organic residue and amount of OH and water. ESR investigations confirm the results obtained from optical and FTIR measurements. It is concluded from the collective data that sol�gel silica glass can serve as acceptable candidate for gamma-rays irradiator and gamma chamber dosimetry. � 2017, Indian Association for the Cultivation of Science.
Corrosion study of glaze-ceramics doped cement-kiln-dust soaked in concentrated HCI
(2010) Essa F.A.; Abd-Elaziz T.D.; Zakariya M.R.; Ezz-Eldin F.M.; Chem. Dept; Faculty of Sci.; Menufya Univ.; Menufya; Egypt; MSA University (October Univ. for Modern Sciences and Arts); 6th October City; Egypt; Color Preparation Dept.; Ceramica-Marselia Factory; Egypt; National Center for Radiation Research and Technology; Cairo; Egypt
NEW glaze-ceramics formulated from industrial waste have been prepared. The method consists of introducing cement-kiln-dust (CKD) in the industrial glaze-ceramics with various ratios (10-50%) together with the addition of 10gm boric acid. The chemical durability of the prepared composite cement-dust-glaze-ceramics (CDGC) is investigated using high concentrations of (2,5 & 8N) HCI acid solutions. CDGC are vitrified by melting for four hours at 1400�C � 250�C depending on the amount of CKD introduced. Specifically, the experimental results indicate that the introduction of CKD in industrial glaze decreases durability. At high HCI concentrations, the durabilities of the prepared glaze-ceramics are observed to decrease with increasing the percentage of (CKD) until certain limit and almost constancy. The corrosion results are explained according to the ion exchange mechanism and formation or dissociation of the modified depleted layer. Some hollow and jogged areas are observed by SEM which might be interpreted as evidence of local corrosion phenomena. In addition, the pH values of the leachant solutions are measured. The comparison of hardness for the optimum glaze-ceramic and glaze-ceramic derivatives prepared in this study indicates a degradation % in their chemical and physical properties depending on the amount% of CKD introduced. It is observed that the degradation not only depends on the amount of CKD introduced, but also on the strength of the leaching HCI acid solution. Also, the results show that, the prepared glazes have a surface hardness values ranged from 5.5 to 2.5 in the Mohs scale.
Effect of dilute HF solutions on chemical, optical, and mechanical properties of soda-lime-silica glass
(2010) Ezz-Eldin F.M.; Abd-Elaziz T.D.; Elalaily N.A.; National Center for Radiation Research and Technology; P.O. Box 29; Nasr-City; Cairo 11765; Egypt; Faculty of Engineering; Industrial Chemistry Department; MSA University; 6th October City; Egypt
Commercially and laboratory prepared soda-lime-silica (SLS) glasses compositions were investigated for corrosion behavior toward varying dilute HF solutions. The corrosion is found to be low in 0.05 M HF solution and relatively high with 0.5 M HF. Infrared reflectance studies were measured to monitor the surface changes after etching process. The corrosion data are explained on the basis of selectivity of HF toward the bridging and nonbridging oxygens. Optical transmittance, impact toughness, and density were measured after corrosion; the data are used to verify the suggested corrosion mechanism. Significant changes were reached on the remeasurement of previous collective studied properties when the commercial glass was irradiated. � 2010 Springer Science+Business Media, LLC.
Influence of Industrial Solid Waste on the Chemical and Mechanical Properties of Traditional Glaze-Ceramics
(Springer Netherlands, 2018) Abd-Elaziz T.D.; Ezz-Eldin F.M.; October University for Modern Sciences and Arts (MSA); 6th October City; Egypt; National Center for Radiation Research and Technology; Atomic Energy Authority; Cairo; Egypt
New glaze compositions were synthesized from combinations of ceramic glaze and cement kiln dust. The products show very good chemical resistance to acid and alkaline corrosion, with no visual changes on the surfaces of the samples. This resistance can be attributed to the very well balanced composition of wastes and commercial ceramic glaze materials. Corrosion data reveal the results of mass loss either at 25 ? or 100 ?. The mass loss is very low, showing that it is possible to develop glazes with excellent chemical resistance to strong acid and alkaline solutions corrosion starting from different concentrations of cement kiln dust associated with commercial ceramic glaze materials. The IR spectra of the prepared samples show characteristic bands related to the vibrations of triangular and tetrahedral borate and tetrahedral silicate groups together with metal-oxide groups. The surface hardness data of the glazes determined by Mohs are found to be 5�6 at early immersion times up to ?9 days, but there is obvious deterioration beyond 9 days. The results point out that it possible to deepen the understanding of the mechanisms of elements released through the chemical attack and their implications on microstructural and mechanical degradation of the working surface of glazed ceramic tiles. � 2016, Springer Science+Business Media Dordrecht.
Vitrified municipal waste as a host form for high-level nuclear waste
(2014) El-Alaily N.A.; Abou-Hussein E.M.; Abdel-Monem Y.K.; Abd Elaziz T.D.; Ezz-Eldin F.M.; National Center for Radiation Research and Technology; P.O. Box 29; Nasr City; Cairo 11765; Egypt; Faculty of Science; El-Mounofia University; El-Mounofia; Egypt; October University for Modern Sciences and Arts (MSA); 6th October City; Egypt
Preparing glass to be used as a radioactive waste immobilizer from municipal waste is the aim of this paper. Up to 90 wt% of municipal waste was obtained by burning the raw waste at 700 C for 5 h; this were successfully vitrified into borosilicate and sodium borate glasses at ~1,200 C. The long term behavior of such glass is one of the most important factors, which is determined by their durability in aqueous solution. Experimental durability data of the prepared glass immersed in ground water together with ?-irradiation was found to be affected according to the different irradiation doses. In addition, thermal analysis and glass surface morphology were investigated. The evolution of the damage on the studied properties was correlated to the changes in the glass network depending on their composition and irradiation dose. The results showed that glass matrix containing higher amount of municipal waste possess high durability and low thermal expansion after being gamma irradiated. The results showed that glass containing higher amount of municipal waste possess high durability and low thermal expansion after irradiation. 2013 Akad miai Kiad, Budapest, Hungary.