Papers by Author: Ming Sun

Abstract: Lithium ion second battery has been grabbing an increasingly larger market share in recent years, and more lithium ion battery uses aluminum laminate foil to separate the cell from the environment. The adhesion strength of the Al layer and polypropylene layer will affect the battery quality, if the adhesion strength is so little that it should lead the battery delamiation in the process of heat sealing, and some of the aluminum laminate will corrosion in a short time and lead the battery scrap quickly.

Abstract: Nano-compounds of ZrO₂/CNTs were prepared by hydrothermal method. The ZrO₂/CNTs nano-compounds were characterizated by XRD, TEM, BET and Zeta potentials. The results showed that perfect hydrothermal temperature was 180°C, hydrothermal time was 11h, pH was 9.5. It is showed by the analysis of TEM and Zeta potential, adding surfacant CTBA, the surface of nano-tube and Zr(OH)₄ colloids take different charge, and they adsorpt each other. And ZrO₂ particles were successfully coated on the CNTs in surface-active agent of CTBA.

Abstract: Nanostructured ZrO₂ was prepared successfully by mechanically activated solid state reaction. The structural and microstructural of products were monitored using X-ray powder diffraction (XRD), transmission electron microscopy (TEM). The effects of ball milling speed and calcined temperature on products were monitored by XRD. The results of XRD show that the most suitable ball milling speed is 150r/min, and the calcined temperature is 600°C. TEM images show that ZrO₂ particles prepare at heating rate of 5°C/min have several advantages in the morphology, spherical shape, narrow size distribution with no hard aggregation, and the particle size is about 15 nm, and at the heating rate of 2.5°C/min, a network structure ZrO₂ can be prepared for the first time.

Abstract: There are many areas in the world where the ground water has been contaminated by arsenic. One process to purify the water is to use TiO₂ to adsorb the arsenic. As the TiO₂ surface can be cleaned and reused, it has a promising potential as a water purifier. In this paper, the plane-wave function method, based on the density functional theory, has been used to calculate the structures of arsenic(III) on a perfect TiO₂ anatase (1 0 1) surface. All the arsenic(III) solution species such as H₃AsO₃, H₂AsO₃^-1, HAsO₃^-2 and AsO₃^-3 are put onto the surface with many different possible structures to obtain the adsorption energy. Based on the adsorption energy, the bidentate binuclear (BB) adsorption configurations of arsenic(III) on the surface are more favorable at low concentrations, whereas BB form and monodentate mononuclear (MM) form may coexist at higher concentrations. The models and results fit well with published experimental results. The results and conclusions will be of benefit to further research on arsenite adsorption and its photocatalytic oxidation on a TiO₂ surface.

Abstract: Reverse micro emulsion method showed some advantages in the preparation of the catalyst MnBaAl11O19-δ with large surface area and high activity, when compared with sol-gel method or co-precipitation method. The influences of water content in reverse micro emulsion on nanostructure catalyst MnBaAl11O19-δ were discussed in this paper. The catalyst MnBaAl11O19-δ was prepared by reverse microemulsion method with a system consisted of 55% of n-heptane, 15% of emulsifier OP-10, 15% of 1-octanol and 15% of water (volume ratio). It resulted in the catalyst a length of 10-30nm plated-like phase and large surface area of 106 m2/g. The catalyst was applied in dimethyl ether combustion and it showed high activity with T10% at 160 °C and T90% at 300 °C. The recycle reverse micro emulsion was reused to prepare the catalyst MnBaAl11O19-δ. The catalyst MnBaAl11O19-δ prepared with that, still showed large surface area of 65m2/g and high activity with T10% at 170 °C and T90% at 320 °C in dimethyl ether catalytic combustion.

Abstract: α-MnO2, β-MnO2 and Mn2O3 were synthesized from birnessite followed by acid treatment and subsequently calcined under different conditions. These catalysts were used for catalytic combustion of dimethyl ether (DME) and characterized by XRD, BET and H2-TPR techniques. The results showed that the catalytic activity of α-MnO2, β-MnO2 and Mn2O3 are higher than that of birnessite. Larger specific surface area as well as the better reducibility of Mn species in the manganese oxides might be the main contribution for the DME combustion activity.