Advanced Materials Research Vols. 1120-1121

Abstract: We synthesized nano-Li₄Ti5O₁₂ particles by solvothermal method. The as-prepared materials were characterized by XRD, SEM, TEM and electrochemical measurements. The Li₄Ti5O₁₂Li4Ti5O12 showed excellent rate capability and cycle ability. The as-preparedLi₄Ti5O₁₂ Li4Ti5O12 electrode exhibited highly initial discharge capacity 176 mAh/g at 0.1 C rate up to, which was slightly higher than its theoretical capacity (175 mAh/g). By increasing the C-rate, the cell showed 152, 143, 138 and 135 mAh/g at 0.5, 1, 1.5 and 2 C, respectively.

Abstract: Magnetic nano materials were known as high adsorption properties Nano-structural Ni2.33Fe alloy was successfully prepared by hydrothermal method and was used to remove CrO42- ions from aqueous solution. The results show that the equilibrium adsorption quantity increased with the increase of initial CrO42- concentration and pseudo-second-order kinetic models were successfully used for fitting the kinetic data. Webb Maurice diffusion model shows adsorption was controlled by external mass transfer followed by internal particle diffusion mass transfer. And the fitting degree of the Langmuir isotherm and the experimental data was quite high. And the Freundlich isotherm also fitted well.

Abstract: A new method for the determination of nitrite was established based on cobalt monoxide (CoO) nanoparticles modified glassy carbon electrode (CS-CoO/GCE). In 0.15mol/L pH 4.0 HAc-NaAc, the CS-CoO/GCE showed a remarkable catalytic and enhancement effect on oxidation of the nitrite. A linear dynamic range of 8.0×10-7 to 6.0×10-3 mol/L (R=0.997) with a detection limit of 1.0×10-7 mol/L was obtained. The electrochemical mechanism was been obtained. This method has been used to determine the content of nitrite in real samples.

Abstract: WS₂ inorganic fullerene like (IF) nanoparticles were synthesised via a modified solid-gas reaction route. Based on the reaction between WO₃ and S at a relatively low temperature (between 450 and 950°C) in H₂/Ar, nanosized WS₂ (<100 nm) with IF structure were readily produced.

Abstract: Based on nanometer related theory, this paper has used H68 alloy for power plant condensers alloy surface nano mechanical polishing method, combining the related theory of materials research, the use of metallographic microscopic analysis, XRD analysis, hardness test and electrochemical corrosion test method, the correlation properties of nano surface treatment of H68 test, around the related properties of nano surface treatment H68 experiment, theoretical analysis and normative analysis, combining qualitative analysis with quantitative analysis, it has concluded that the surface nano can improve the corrosion resistance of H68 alloy in ammonia solution.

Abstract: In this paper, PLA nanofibrous mats were obtained via solution blowing. PLA fibers diameter ranged from 400 to 1000 nm produced are that the solution concentration is 7%, air blowing pressure is 0.12MPa, the solution injecting rate is 0.9ml/h. Furthermore, the PLA nanofiber morphology and formation were investigated under different distance of collector. The results indicate that the distance of collector plays an important role for the PLA fiber formation during solution blowing.

Abstract: Through-hole TiO2 nanotube arrays were successfully prepared by using mechanical coupling Ti/Ti foils as anode. By continuously anodization, one Ti foil was thoroughly fabricated into TiO2 nanotube arrays, and the bottom barrier of TiO2 nanotube arrays was extended to the other Ti foil layer. The physical gap between two Ti foils allowed the TiO2 nanotube arrays to be easily separated from the barrier layer. Thus the through-hole TiO2 nanotube arrays were obtained. The method is simple but effective to thoroughly remove the bottom barrier layer and obtain through-hole TiO2 nanotube arrays without any complicated processes.

Abstract: Carbon/CNTs hybrid nanofibers (200-300 nm in diameter) were prepared by electrospinning a precursor of polyacrylonitrile (PAN) and surface modified CNTs. CNTs modified by strong acid are well dispersed in the PAN precursor which is critical for homogenous carbon/CNTs hybrid nanofibers. The prepared nanofibers are promising reinforcements for carbon or resin based composites.

Abstract: Hexagonal NaYF⁴:Yb³⁺/Er³⁺ microsheets were successfully synthesized via a hydrothermal method assisted by sodium oxalate as a shape modifier. XRD, FE-SEM, TEM and SAED have been used to study the morphologies and crystal structure of the products. The effects of the pH values on the crystal structure, morphology and size were discussed. The hexagonal NaYF⁴:Yb³⁺/Er³⁺ microsheets show characteristic upconversion fluorescence at green (521-540 nm) and red (630-680 nm) corresponding to the 4f-4f transition of Er³⁺. The green and red emission intensity for microsheets has a great increase compared to that for hexagonal microspheres, and the intensity of the green emission is greater than that of the red one.

Abstract: In this paper, property research of silk fibroin nanofibers by electrospinning dissolved in CaCl₂-Formid Acid was discussed. The dissolve process, morphology, structure and mechanical properties of fibers were studied. It showed that more dissolution time was needed to dissolve silk with 1% CaCl₂. The diameters of silk fibroin nanofibers decreased with the CaCl₂ contents increased and the surface of 6%5% fibers was more uniform and smooth. After ethanol treatment, strong peak at 1628cm^-1, 1517cm^-1 and 1231cm^-1 was corresponding to β-sheet. It was important to discover that silk fibroin was weakly destroyed in CaCl₂-FA solvent system, and the regenerated silk fibroin nanofibers had better mechanical properties. The stress of 6%5% fibers was nearly 3 times to traditional way. With different content of CaCl₂, the stress of 6%5% fibers was nearly 2 times to 6%1% fibers.