In this study, α-ZrP-CPC layered compound was gained by inserting cetyl pyridinium chloride (CPC) into α-ZrP with amines as pillaring agent. The amount of CPC intercalated reached the highest with the molar ratio of...
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In this study, α-ZrP-CPC layered compound was gained by inserting cetyl pyridinium chloride (CPC) into α-ZrP with amines as pillaring agent. The amount of CPC intercalated reached the highest with the molar ratio of the amine/α-ZrP being 2. The lower concentration of CPC resulted in more CPC molecules intercalated into the interlayer of α-ZrP, The intercalation products were characterized by XRD, IR, TG-DSC and SEM. The result of TG-DSC showed that the amount of xylene adsorbed reached the peak value of 5.56%, when the content of CPC in α-ZrP-CPC was 41%.
The surface tension of molten AlSi20 alloy has been measured by using the sessile drop method at 923―1123 K under argon atmosphere in both heating-up and cooling processes. The result shows that the surface tension o...
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The surface tension of molten AlSi20 alloy has been measured by using the sessile drop method at 923―1123 K under argon atmosphere in both heating-up and cooling processes. The result shows that the surface tension of this alloy decreases as long as temperature increases. The results of surface tension and contact angles in heating-up process have differences from those obtained in cooling process, because the metal microstructures have some changes at different temperatures based on the metal genetic theory. The surface tension of molten AlSi20 alloy and that of molten pure aluminum have been compared as well, and the temperature coefficient of AlSi20 alloy is slightly lower than that of Al. The result has been analyzed by the linear scanning analysis with ESEM. The concentration of silicon in most region of the bulk is lower than that of the surface and the addition of Si to pure Al decreases the surface tension of molten pure Al.
Now LiCoO2 is the most widely used electrode material in commercial rechargeable lithium-based batteries; however, the toxicity of cobalt and the scarcity of cobalt sources, as well as the limited charge/discharge cap...
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Now LiCoO2 is the most widely used electrode material in commercial rechargeable lithium-based batteries; however, the toxicity of cobalt and the scarcity of cobalt sources, as well as the limited charge/discharge capacity（130-140 mA.h.g-1） of LiCoO2 electrode drive many efforts to develop various alternative electrode materials, including diverse transition metal oxides and their lithiated counterparts. Amongst them, iron oxides,
Activated carbon was employed as the adsorption carrier for the metal ions in HCl solution of red mud, a solid waste produced in alumina industry. To improve the adsorption capacity to valuable metal ions, the activat...
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Activated carbon was employed as the adsorption carrier for the metal ions in HCl solution of red mud, a solid waste produced in alumina industry. To improve the adsorption capacity to valuable metal ions, the activated carbon was modified by chemicals including HNO3, H2O2, H2SO4, H3PO4, NH3, Na2CO3, and tri-butyl phosphate (TBP). It was found that the modifications contributed the high adsorption capacity to almost all metal ions we focused on. In the case of TBP, remarkably higher adsorption capacity and selectivity of Sc3+ was observed. The correlation between the surface areas, IR spectra of those chemically modified activated carbons and adsorption was schemed.
Gadolinia doped ceria (GDC) nano-powder was synthesized through a homogeneous precipitation process, using hexamethylenetetramine as the precipitator. XRD revealed that the as-synthesized powder already had a cubic fl...
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Gadolinia doped ceria (GDC) nano-powder was synthesized through a homogeneous precipitation process, using hexamethylenetetramine as the precipitator. XRD revealed that the as-synthesized powder already had a cubic fluorite structure of ceria, and BET revealed that the GDC powder had a surface area of 68.3 m2/g and an average grain size of about 12 nanometers. Sintering behaviors of the GDC powder were studied via non-isothermal experiments. It demonstrated that the powder exhibited high sintering activity, where GDC green films prepared via dip coating using the slurry directly formed by the homogeneous precipitation process can be sintered to nearly full density at 1300°C, as revealed by the Field Emission SEM investigations. The thickness of the sintered GDC film after one coating-sintering cycle was 3 μm and it can be controlled through adjusting the GDC concentration in the slurry and repeating the coating-sintering cycle.
In this paper, mass production of quasi-aligned CNTs was achieved with a new tri-metallic catalyst (Fe-Ni-Mo/MgO) by thermal CVD method, using methane as carbon precursor. The growth process was in-situ monitored by t...
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In this paper, mass production of quasi-aligned CNTs was achieved with a new tri-metallic catalyst (Fe-Ni-Mo/MgO) by thermal CVD method, using methane as carbon precursor. The growth process was in-situ monitored by thermal gravimetry/differential scanning calorimetry (TG-DSC) technique, and the yield of CNTs over 2200% was attained under the mixture atmosphere of CH4 and H2 with flow rate about 25 ml/min and 5 ml/min respectively at 900°C for 30 min. The as-prepared products were characterized. Raman spectrums showed that the CNTs are multi-wall structure. The diameter of the CNTs was estimated to be 20-30 nm. We think the synergism of FeNi3 alloy and Mo is the main reason for the high catalytic activity of tri-metallic catalyst.
ZnO nanoparticles were synthesized by esterification reaction between zinc acetate and absolute ethanol under solvothermal conditions. The influences of reaction parameters and different surfactants on the size and mo...
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The sintering behavior of white carbon powders by spray pelletization is investigated by DSC and high temperature dynamic XRD. The results reveal that transformation from amorphous white carbon black to crystalline oc...
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The sintering behavior of white carbon powders by spray pelletization is investigated by DSC and high temperature dynamic XRD. The results reveal that transformation from amorphous white carbon black to crystalline occurs at high temperature. And the transformation temperature of the pelleted particles is 80°C lower than that of the white carbon black powder. Using Kissinger and Doyle-Ozawa methods, the apparent activation energy of the pelleted particles is 310 kJ/mol, and with increase of the crystallized fraction, the crystallization energy decreases.
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