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RISS 인기검색어
- 검색키워드
- 저자 : M.S. Abd El-sadek (검색결과 3 건)
- 무료
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M. ATTALLA,S. SADEK,W. ABD EL-FADEEL 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.3
The objective of this study is to investigate the adsorption characteristics of granular activated carbon GAC/R-134a pair in the temperature range of 20–60°C and pressure up to 10 bars. The Dubinin–Astakhov adsorption equilibrium model is fit to experimental data with acceptable error limit. The pressure–temperature–concentration (P–T–X) diagram of the pair is also presented. The isosteric heat of adsorption of R-134a on AC has been calculated using the Clausius–Clapeyron equation as a function of adsorption capacity. The maximum adsorption capacity was found to be 1.92 kgR134a/kgcarbon at 20°C after 1200 s. The experimental results also shows that the increase of heat transfer area improves the adsorption capacity per kg of adsorber, which lead to the design of a finned tubes heat exchanger adsorption unit.
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A controlled approach for synthesizing CdTe@CrOOH (core-shell) composite nanoparticles
M.S. Abd El-sadek,S. Moorthy Babu 한국물리학회 2011 Current Applied Physics Vol.11 No.3
A seed-mediated growth approach was used to synthesize CdTe@CrOOH core-shell composite nanoparticles in aqueous solution. Chromium oxyhydroxide shell was developed around a small quantum dot that can lead to composite particles which is expected to lead to some new properties and applications. The aqueous synthesized CdTe nanoparticles with bi-functional molecules (Mercaptoacetic Acid (MAA))at pH = 11.2 served as cores, and CrOOH was deposited on them to form core-shell nanoparticles in aqueous solution. The effect of refluxing time and the concentration of Cr^3+ on the preparation of these samples were measured using UV―Visible absorption and photoluminescence analysis. The emission peak of the resulted core-shell composite nanoparticles (CdTe@CrOOH) shifted from 605 (CdTe seed) to 630 nm. The sizes of CdTe nanoparticles averaged about 3.22 nm, and the CdTe@CrOOH composite nanoparticles averaged about 6.68 nm. The particles after coating with hydroxide shell were bigger than the uncoated CdTe seeds. The synthesized CdTe@CrOOH core-shell nanoparticles were characterized with XRD, EDAX, FT-IR, EPR, TEM, and thermal analysis (TG/DTG curves). The synthesized core-shell composite nanoparticles were subjected to suitable magnetic field to understand the effect on UV ―visible absorption and photoluminescence spectra. The results show that as-prepared nanoparticles with core/shell structure exhibit interesting optical properties.
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The role of potassium tellurite as tellurium source in mercaptoacetic acid-capped CdTe nanoparticles
M.S. Abd El-sadek,J. Ram Kumar,S. Moorthy Babu 한국물리학회 2010 Current Applied Physics Vol.10 No.1
Water-soluble CdTe nanoparticles were synthesized in aqueous solution with the assistance of mercaptoacetic acid (MAA) molecules by wet chemical route and microwave-assisted method. A series of cadmium telluride (CdTe) nanoparticles capped with a bifunctional molecule, which contains both thiols and carboxylic acid groups were prepared using different pH values and using potassium tellurite as tellurium source. Thiol-capped nanocrystals of CdTe can be isolated as powders using 2-propanol. The synthesized thiol-capped CdTe were characterized with EDAX, TEM, Raman, FT–IR, UV–Visible absorption,fluorescence spectroscopy and X-ray diffraction (XRD) for the particle size determination and to understand their optical properties. The particles crystallize predominantly in cubic phase with narrow photoluminescence emission. Potassium tellurite as source of tellurium improves the photoluminescence efficiency and also avoids the cumbersome processes associated with H2Te or NaHTe sources.
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