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RISS 인기검색어
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- 저자 : Numan Salah (검색결과 3 건)
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Carbon rich fly ash and their nanostructures
Numan Salah,Sami S. Habib,Zishan H. Khan,Ahmed Alshahrie,Adnan Memic,Attieh A. Al-ghamdi 한국탄소학회 2016 Carbon Letters Vol.19 No.-
Carbon rich fly ash was recently reported to have compositions that are ideal for use as a precursor and catalyst for carbon nanotube growth. This fly ash powder is mostly composed of pure carbon, predominantly present as sp2. In this work, the effect of sonication time on the morphology and structural properties of carbon rich fly ash particles is reported. The obtained results show that ultrasound treatment is an effective tool for producing ultrafine particles/fragments with higher porosity, which might be suitable for the adsorption of gasses. Moreover, carbon nanoparticles (CNPs) of this fly ash were produced in parallel using the ball milling technique, and were evaluated as reinforcements for epoxy based composites. These CNPs have almost spherical shapes with particle sizes of around 30 nm. They were found to have strong C=O carbonyl group bonds, which might be generated during the ball milling process. The tensile testing results of a fly ash CNP reinforced epoxy composite showed significant improvements in the mechanical properties, mainly in the stiffness of the polymer. The stiffness value was increased by around 23% of that of neat epoxy. These CNPs with chemically active groups might also be useful for other applications.
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Jamshaid Rashid,M.A. Barakat,Numan Salah,Sami S. Habib 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Zinc oxide nanoparticle thin films were synthesized on glass substrate by radio-frequency magnetron sputtering (RF Sputtering) technique. The thin films were characterized and tested for optical properties by using different techniques such as field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV–visible spectrophotometry and fluorescence spectrofluorophotometry. The produced nanoparticle ZnO thin films were investigated as photocatalyst for degradation of 2- chlorophenol (2-CP) in synthetic wastewater solutions under UV irradiation. Complete degradation of 2- CP was achieved by ZnO thin film (200 nm thickness) within 3 h at solution pH 3. The photocatalyst retained its high efficiency even after three reuse cycles.
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Fabrication of Co-Doped ZnO Nanorods for Spintronic Devices
Ameer Azam,Faheem Ahmed,Sami S. Habib,Zishan H. Khan,Numan A. Salah 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.4
Herein, single-crystalline Zn1-xCoxO (0.0≤x≤0.10) nanorods were prepared using a facile microwave irradiation method. Structural analyses by X-ray diffraction and transmission electron microscopy revealed the incorporation of Co2+ in the lattice position of Zn2+ ions into the ZnO matrix. Field emission scanning electron microscopy and TEM micrographs revealed that the length and diameter of the undoped ZnO nanorods were about ~2 μm and ~200 nm, respectively. For Co-doped ZnO, the length and diameter were found to increase with an increase of Co doping. The selected area electron diffraction pattern indicated that the Zn1-xCoxO (0.0≤x≤0.10) nanorods had a single phase nature with the preferential growth direction along the [0 0 1] plane. Raman scattering spectra confirmed the shift of the E2high mode toward a lower wave number, suggested successful doping of Co ions at Zn site into the ZnO. Magnetic studies showed that Co doped ZnO nanorods exhibited room temperature ferromagnetism and the magnetization value increased with an increase in Co doping. The synthesis method presented here is a simple approach to prepare ZnO based diluted magnetic semiconductors nanostructures for practical application to spintronic devices.
ScienceON
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