Applied Mechanics and Materials Vols. 268-270

Abstract: The structure of sericite is very stable, so it is hard to peel it directly using traditional methods. In this article, the sericite which was processed through thermal activation, acid treatment, Na-modification and CTAB intercalation was used as raw material to do the exfoliation. The mechanical exfoliation method and ultrasonic method were used respectively to exfoliate the modified sericite. The grain size of final product using mechanical exfoliation method reached 16.6nm and the grain size of final product using ultrasonic method reached 8.1nm. Alongside with the result of TEM images, the ultrasonic method is thought to be better.

Abstract: PbO@C nanocomposites were synthesized by soaking maize in Pb(NO3)2 solutions followed by calcination in nitrogen atmosphere. TEM photos showed highly dispersed PbO nanoparticles homogeneously embedded in the carbon matrix and the main particle sizes of PbO were distributed between 15-29 nm. Electrochemical tests revealed a high specific capacity of 152.6 Fg-1 and good stability at discharge current density of 1.0 Ag-1.

Abstract: PU/CS nanofiber membrane was prepared by means of electrostatic spinning. The morphology of nanofiber membrane was examined by a scanning electron microscope (SEM), and the mechanical property, water absorption, moisture permeability and antibacterial performance were also investigated. The results show that the diameter and mechanical property of PU/CS nanofiber decreased with the increase of the content of CS. However, the water absorption, moisture permeability and antibacterial performance were improved significantly with the addition of CS.

Abstract: A kind of pullulan biopolymer nanofibers with diameter of 100～700nm were obtained using redistilled water as solvent through electrospinning technology in this paper. The effects of the spinning solution concentration, applied voltage, flow rate and capillary–screen distance on morphology and diameter distribution of pullulan nanofiber were studied by SEM. The results show that, different parameters had great influence on nanofibers’ morphology and diameter. The optimal parameters of pullulan nanofibers electrospinning were: 22wt.% spinning solution concentration, 31 kV voltage, 20 cm capillary–screen distance and 0.5ml/h flow rate.

Abstract: The AZO thin films had been prepared on glass substrates by APCVD process .The transmittance spectra of AZO thin films was measured with S-600 UV-Vis spectrophotometer . The visible light transmittance values of AZO thin films are about 85% and the thickness of the thin films well-distributed by the transmittance spectra of AZO films. Using the envelope method, the film thickness d is calculated about 964.43nm and the discrepancy is only 0.56% compared with the result of instrument measurements. The curve about the refractive index n with the incident wavelength is consistent with the reported literature results. The envelope method is suitable for the optical constants processing of some similar AZO films where exist weak absorption ranges (T≥0.4).

Abstract: CdSe/ZnO core/shell semiconductor nanocrystals which show high luminescence quantum yield have been synthesized through a simple routine without the use of any pyrophoric organometallic precursors. Transmission electron microscope image demonstrates the shape, monodispersity, average size, size distribution and core-shell structure of CdSe/ZnO nanocrystals. We use a combination of X-ray diffraction, UV-Vis absorption spectroscopy and photoluminescence to analyze the core/shell nanocrystals and determine their chemical composition, optical character and internal structure.

Abstract: In textile techniques, woven, knitted, non-woven and braiding techniques all can be used to weave tubular fabrics as intraluminal stents. The radial force is the most basic mechanical property of intraluminal stent. In this study, the influence of braiding parameters such as braided materials, diameter of stents and gear ratio on the radial compressive property of braided stents were studied.

Abstract: The chroma in tannery effluent was treated by prepared flocculant at different conditions. The results showed that the suitable reaction conditions were attained at a normal temperature, pH of 8, flocculant of 0.2 g/L when the shaking speed of 150 r/min and the reaction time was 15 min. Through testing the saccharide and protein in the flocculant, it was found that the flocculant contained saccharide and protein. These may contribute to the application of the flocculant to chroma removal in tannery effluent.

Abstract: Methanotrophs are aerobic microorganisms that utilize methane as substrates for growth and PHB Biosynthesis. Copper plays an important role in cell growth and PHB biosynthesis. The effect of initial copper concentration on cultivation of M. trichosporium IMV 3011 on methane was investigated. With the addition of 30μmol/L CuSO4•5H2O, PMMO activity improved to 4 times of that without copper addition. The highest density of cultivated cells is 0.48g dry wtL-1, which is 2 times of that without copper addition. The lag time shortened to 15.87h, and the growth rate increased to 0.082h-1.The PHB content increased to 8.3%. It is found that certain initial copper concentration is beneficial to expression of high particulate methane monooxygenase activity, which may contribute to the synthesis of PHB in the cell.

Abstract: The amidoximated Polyacrylonitrile (PAN) fiber was applied for the support to immobilize Fe(bpy)32+ through ionic bonds, and the obtained fibrous complex was used as heterogeneous Fenton catalyst for the degradation of Rhodamine B under visible light irradiation. The results indicated that increasing Fe(bpy)32+ concentration in solution led to higher Fe(bpy)32+ content on the prepared catalysts, and the amidoxime groups helped greatly for the immobilization of Fe(bpy)32+ via coordination effect. This catalyst exhibits an obvious absorption in the visible region and could effectively degrade Rhodamine B in the presence of H2O2 under visible light irradiation. In addition, no deactivation of the catalyst was observed even after five consecutive runs of dye degradation.