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RISS 인기검색어
- 검색키워드
- 저자 : Ewais E. A. (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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E.M.M. Ewais,A.M.M. Ameen,Y.M.Z. Ahmed 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
Cordierite-based porous ceramic samples were successfully prepared using a mixture composed of waste silica fumes, bauxite and talc via a polymeric sponge replica technique. Firstly, the optimum sintering conditions (in terms of sintering temperature and time) for acquiring as much of the cordierite phase with the absence of undesirable ones were determined for a dense mixture compact. The results revealed that a sintering temperature of 1350℃ and a sintering time of 2 h were the most appropriate conditions during cordierite synthesis. Secondly, the key role for the successful fabrication of a porous ceramic body via replica method is to prepare a well-dispersed suspension from the mixture of raw materials. Here the optimum conditions for preparing a well-dispersed suspension in terms of type and concentration of additives as well as suspension pH were evaluated. The using of 0.2% sodium silicate and a suspension pH of 8 were found to be the most favorable conditions for obtaining a well-dispersed suspension. Thirdly, in order to prepare porous cordierite, polyurethane foam was impregnated with a well-dispersed suspension and sintered at the optimum conditions conducted for a dense cordierite sample. The porous cordierite produced was found to possess 46.4% total porosity. The porosity was comprised of large and small interconnected pore surrounded by a web of ceramic. This structure is suitable for applications in filtering purposes. Cordierite-based porous ceramic samples were successfully prepared using a mixture composed of waste silica fumes, bauxite and talc via a polymeric sponge replica technique. Firstly, the optimum sintering conditions (in terms of sintering temperature and time) for acquiring as much of the cordierite phase with the absence of undesirable ones were determined for a dense mixture compact. The results revealed that a sintering temperature of 1350℃ and a sintering time of 2 h were the most appropriate conditions during cordierite synthesis. Secondly, the key role for the successful fabrication of a porous ceramic body via replica method is to prepare a well-dispersed suspension from the mixture of raw materials. Here the optimum conditions for preparing a well-dispersed suspension in terms of type and concentration of additives as well as suspension pH were evaluated. The using of 0.2% sodium silicate and a suspension pH of 8 were found to be the most favorable conditions for obtaining a well-dispersed suspension. Thirdly, in order to prepare porous cordierite, polyurethane foam was impregnated with a well-dispersed suspension and sintered at the optimum conditions conducted for a dense cordierite sample. The porous cordierite produced was found to possess 46.4% total porosity. The porosity was comprised of large and small interconnected pore surrounded by a web of ceramic. This structure is suitable for applications in filtering purposes.
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Abd El-Motaleb M.,Abd El-Hameid Asmaa R.,Helmy Wafaa A.,Ewais E. A.,Abdel-Hady M. S. 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.4
Origanum syriacum ssp. sinaicum is a medicinal perennial endemic herb grown in the mountain areas in Saint Katherine, Sinai, Egypt. Leaves of this species have a history of use in traditional herbal medicine. The efects of Murashige and Skoog’s medium (MS) containing auxins alone or in combination with cytokinin to produce calli were investigated. The obtained results showed that MS medium containing 2 mg L−1 2,4-dichlorophenoxyacetic acid (2,4-D) alone recorded the earliest callusing time and the best callus percentage formation. The combination of 0.25 mg L−1 6-benzylaminopurine (BA) with 2 mg L−1 2,4-D resulted in the highest callus percentage and fresh weight. The diferent levels of growth regulators in the media exhibited the morphological changes in calli. Nodal segments were more efective than leaf explants in terms of callus percentage, callus fresh and dry weight, and callus initiation time. After 45 days of callus culture, the combination of 1 mg L−1 BA with 0.25 mg L−1 α-naphthalene acetic acid (NAA) was successful in promoting organogenesis, resulting in a high frequency of shootlets. The maximum number of rooting shootlets was achieved by supplementing the MS medium with 0.5 mg L−1 indole-3 butyric acid (IBA). This study reports an efective plant regeneration protocol that can be used for the conservation of endemic species.
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