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Wang L.,Zhengzhou University of Light Industry | Wang L.,Henan Provincial Key Laboratory of Surface and Interface Science | Zhang K.,Zhengzhou University of Light Industry | Gu S.,Zhengzhou University of Light Industry | Zhang Y.,Zhengzhou University of Light Industry
Advanced Materials Research | Year: 2011

The microscopic structure of Pb-Ca alloys and Pb-Ca-Snx-Al alloys was observed by scanning electron microscope (SEM). The high temperature effect on corrosion behaviors and anode film Pb(?) of Pb-Ca alloys and Pb-Ca-Snx-Al alloys was studied using linear sweep voltammetry, electrochemical impedance spectra (EIS) and AC voltammetry. It was found that the oxidation tendency of t-PbO to nonstoichiometric oxide PbOx and PbSO4 to ß-PbO2 may be increased at high temperature. With the increase of tin content, total corrosion and harm of corrosion can be reduced, the resistance of anode film decreased and the ions motion tendency enhanced. © (2011) Trans Tech Publications. Source


Sun Y.,Zhengzhou University of Light Industry | Song S.,Zhengzhou University of Light Industry | Wang G.,Zhengzhou University of Light Industry | Li Z.,Zhengzhou University of Light Industry | And 2 more authors.
Proceedings - 2010 7th International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2010 | Year: 2010

Eighty eight tobacco samples from six provinces in China, of which the contents of rare earth elements (REEs) were determined by microwave digestion-inductively coupled plasma mass spectrometry method. A fuzzy clustering method, fuzzy cmeans (FCM), was used for classification of the different kinds of tobaccos based on their contents of REEs. The results show that FCM clustering analysis is a valid method for classification of tobaccos to some extent. The relationship between the contents of REEs in tobaccos and the geographical origins is also confirmed. ©2010 IEEE. Source


Zhang Y.,Zhengzhou University of Light Industry | Zhang Y.,Henan Provincial Key Laboratory of Surface and Interface Science | Li G.-Y.,Zhengzhou University of Light Industry | Gao H.-L.,Zhengzhou University of Light Industry | And 5 more authors.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2013

MnO2 powders with micro/nano spheres and microrods for supercapacitors were synthesized via a simple, quick and low-temperature hydrothermal method. Their preparation process was optimized by orthorhombic test and single factor experiment. The crystalline structure, surface morphology and supercapacitive properties of the as-prepared MnO2 powders were studied by X-ray diffraction, scanning electron microscopy and electrochemical measurement. Experimental results show that the optimal reaction conditions are the reaction temperature of 150°C, the KMnO4/MnCl2 molar ratio of 2.5: 1.0, the reaction time of 3 h, and the filling factor of 40%. Under the optimal conditions, the as-prepared MnO2 powders have typical α-MnO2 structure with hollow and porous micro/nano spheres and microrods. The α-MnO2 micro/nano sphere diameter is about from 0.2 to 0.8 μm, while the α-MnO2 microrods have the diameter of 30 nm and the length of 5 μm. The discharge specific capacitance of products at the 5th discharge cycle retains 255, 170, 133, 105 and 88 F·g-1 at current densities of 100, 150, 200, 250 and 300 mA·g-1, respectively. Moreover, the values of equivalent series resistance and charge transfer resistance decrease to 0.37 Ω and 0.40 Ω, respectively. Source


Liu Y.-F.,Henan Provincial Key Laboratory of Surface and Interface Science | Liu Y.-F.,Zhengzhou University of Light Industry | Wang L.,Henan Provincial Key Laboratory of Surface and Interface Science | Shi W.-Z.,Henan Provincial Key Laboratory of Surface and Interface Science | And 3 more authors.
RSC Advances | Year: 2014

This study focused on the synthesis of novel chiral Ag2S and Ag2S-Zn nanocrystals (NCs) with chiral Pen as a capping reagent in an aqueous solution. Luminescence studies indicated that all the prepared Ag2S and Ag2S-Zn NCs exhibited size-tunable photoluminescence (PL) emission at 500-700 nm. Compared with Ag2S, the PL emission of the Ag2S-Zn NCs could improve by around 2.4-fold. XRD peaks of the as-prepared Ag2S NCs were weak, whereas the XRD peaks of the Ag2S-Zn NCs had the characteristics of a monoclinic crystal structure. The circular dichroism (CD) test showed that the prepared NCs revealed a clear mirror-image relationship in their CD signals at 300-700 nm, and Zn2+ played a key role in the Cotton effect of the NCs. The chiral and fluorescent properties of these NCs are likely to find widespread applications in bioimaging, chemical and biosensing, and possibly in asymmetry catalysis. © the Partner Organisations 2014. Source


Zhang H.,Zhengzhou University of Light Industry | Zhang H.,Henan Provincial Key Laboratory of Surface and Interface Science | Dong F.,Zhengzhou University of Light Industry | Dong F.,Henan Provincial Key Laboratory of Surface and Interface Science | And 4 more authors.
Advanced Materials Research | Year: 2012

Poly(butyl methacrylate) (PBMA) colloidal crystal templates were assembled orderly on the clean substrates of monocrystalline silicon by dip-drawing technique and titanium dioxide (TiO 2) macroporous membranes were prepared by using sol-dipping template method to fill the interstices among the PBMA templates, followed by calcination to remove the templates at 550°C. Calcination of the PBMA templates was carried out according to the following procedure: the rate of rising temperature was 5°C/min from room temperature to 150°C, 2°C/min from 150°C to 270°C, 1°C /min from 270°C to 430°C, 2°C/min from 430°C to 550°C and maintained it at 550°C for 2h. X-ray diffraction (XRD) spectra indicated the macroporous materials were anatase structure. The polymerization mechanism of BMA with Fenton reagent as a new initiator was discussed, and the removal process of the PBMA templates and the formation of TiO 2 pore size were investigated, respectively. The results showed that the new method of polymerization overcomes many problems associated with the conventional emulsion polymerization techniques such as long reaction time, necessary deoxygenation, and complicated operation. Source

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