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RISS 인기검색어
- 검색키워드
- 저자 : O. A. FOUAD (검색결과 3 건)
- 무료
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O. A. FOUAD,M. S. EL-SHALL 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.5
Copper, nickel and cobalt metals and oxides needle-like shape nanoclusters have been synthesized successfully by chemical reduction in solution without using a surfactant. XRD analyses showed that copper and nickel metals could be synthesized in a short time period by a microwave irradiation (MWI) — assisted step wise reduction of metal ions in basic solution using hydrazine as a reducing agent whereas cobalt was mainly precipitated in the form of either hydroxide or oxide. TEM images showed that the size of needle-like shape nanoclusters varying from about 5 nm to few hundred nanometers length. On the other hand, copper and cobalt showed high catalytic activity toward CO oxidation than that of nickel. The mechanism of catalytic oxidation reactions over unsupported metals and oxides are also discussed.
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A. Magdy,Y.O. Fouad,M.H. Abdel-Aziz,A.H. Konsowa 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Fe3O4/kaolin magnetic nanocomposites were prepared by chemical co-precipitation method. Thenanocomposites were characterized using various instrumental techniques. The prepared nanocompositeswere tested and evaluated as an adsorbent in the removal of the anionic C.I. Direct Red 23 dye. The effects of contact time, initial dye concentration, adsorbent dose, temperature and initial pH of thesolution on the adsorption process were studied. The removal efficiency reached 100%. The resultsshowed that linearized Langmuir isotherm is applicable with a maximum adsorbent capacity of22.88 mg g 1. Adsorption process is spontaneous, endothermic, and follows the pseudo-second ordermodel within the range of temperatures studied.
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Fouad Hany A.,da Camara Claudio A.G.,de Moraes Marcilio M.,de Melo João P.R. 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Sitophilus zeamais is a major cause of damage to corn and its preventive control is performed with DeltamethrinPiperonyl Butoxide (deltamethrin-PBO). However, due to the intensive use of conventional insecticides, the population of S. zeamais has developed resistance to nearly all classes of insecticides. In order to establish new control practices through the reduction of the use of conventional insecticides for management of S. zeamais, the present study was to evaluate the insecticidal activities and synergistic interaction between five essential oils, as well as six chiral constituents with deltamethrin-PBO used in the preventive control of S. zeamais. The chemical analysis revealed a high percentage of monoterpenes in the oils investigated. Limonene was the major compo nent found in the oils from Citrus aurantifolia and C. reticulata. Citronellal, terpinen-4-ol and menthol were the major constituents in the oils from Eucalyptus citriodora, Melaleuca alternifolia and Mentha piperita, respectively. Oil from M. alternifolia exhibited greater toxicity. Among chiral constituents, (R)-(+)-Limonene, (1R,5R)-(+)-α-pinene and (1S,5S)-(-)-α-pinene were the most toxic against the pest. Binary mixtures prepared with synthetic insecticide and oils exhibited two synergistic interactions. Mixtures prepared with deltamethrin-PBO and (R)-(+)-limonene showed one synergistic interaction. These results are promising, particularly the Citrus oils and its main constituent, (R)-(+)-limonene, which increased the mortality of S. zeamais by 56.41; 43.58 and 35.89 %, respectively. The present findings suggest that the impacts on the environment and human health with the indiscriminate use of deltamethrin-PBO can be minimized with the preparation of a formulation of this insecticide combined with Citrus oils.
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