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Zhu B.,Wuhan University of Science and Technology | Wei G.,Wuhan University of Science and Technology | Li X.,Wuhan University of Science and Technology | Ma Z.,Zhejiang Zili Co. | Wei Y.,Shandong Shengquan Chemical Company Ltd
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2014

Effect of carbonization temperatures on the microstructure and oxidation resistance for the carbon derived from doping modified phenol resin was investigated. The carbon structure was characterized by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy, respectively. The corresponding oxidation resistance was measured by differential scanning calorimetry. The results show that the carbonization temperature has an influence on the carbon structure derived from doping modified phenol resin. The graphitization degree of carbon structure increases with the increase of carbonization temperature. The massive carbon whiskers with the size of 50-100 nm in diameter and the nanometer-scale length are formed on the dopant surface at 600°C. The respect ratio of carbon whiskers increases with increasing the carbonization temperature. However, the quantity of carbon whiskers gradually decreases. The massive carbon microspheres with the size of 100-500 nm in diameter are generated on the surface of dopants at 1000°C. The maximum oxidation temperature for the carbon product derived from doping modified phenol resin is increased by 80°C, compared to that for resin carbon without any dopants. Source


Zhu B.,Wuhan University of Science and Technology | Wei G.,Wuhan University of Science and Technology | Li X.,Wuhan University of Science and Technology | Ma Z.,Zhejiang Zili Co. | Wei Y.,Shandong Shengquan Chemical Company Ltd
International Journal of Materials Research | Year: 2014

Upon application of nano-sized metallic Ni particles as catalyst, the in-situ synthesis mechanism of spinel whiskers in MgO-C refractories was studied. Their phase composition and morphology were determined by means of X-ray diffraction and scanning electron microscopy supported by energy dispersive spectroscopy. The results show that when the catalyst of nano-sized Ni was added in MgO-C refractories, the granular MgAl2O4 (MA) spinels transformed into the shape of whiskers at 1 200°C. The presence of Ni catalyst can accelerate the generation of Mg vapor, which can react with Al vapor to form MA spinel whiskers. Through dissolution and precipitation, MA spinel crystals nucleate directly and grow into whiskers from the catalytic droplets of nano-sized metallic Ni particles. The growth of spinel whiskers follows a typical vapor-liquid-solid (V-L-S) growth mechanism. © 2014 Carl Hanser Verlag GmbH & Co. KG. Source


Li J.-Y.,Shandong University | Sun T.,Shandong University | Hao A.-Y.,Shandong University | Qiao H.,Shandong Shengquan Chemical Company Ltd | Xin F.,Shandong University
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the title compound, C12H14N2O 2, the quinoxaline ring system and the C atoms of the methylene and methyl substituents lie on a mirror plane. The crystal packing is stabilized by weak π-π inter-actions [centroid-centroid distance = 3.680 (7) Å]. Source


Sun T.,Shandong University | Li J.,Shandong University | Qiao H.,Shandong Shengquan Chemical Company Ltd | Hao A.,Shandong University | Li Y.,Shandong University
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

The complete molecule of the title compound, C12H 12N2O2, lies on two crystallographic symmetry elements: a twofold axis and a mirror plane. In the molecular structure, the quinoxaline ring and two methylene substituents lie on the mirror plane while the other two methylene groups are disordered about the plane. The crystal packing is stabilized by weak intermolecular π-π stacking interactions with centroid-centroid distances of 3.6803 (7) Å. Source


Sun T.,Shandong University | Zhang H.,Shandong University | Kong L.,Shandong University | Qiao H.,Shandong Shengquan Chemical Company Ltd | And 3 more authors.
Carbohydrate Research | Year: 2011

A modified cyclomaltoheptaose (β-cyclodextrin) containing an anthraquinone moiety, mono[6-deoxy-N-n-hexylamino-(N′-1-anthraquinone)]- β-cyclodextrin (1), which can self-assemble into nanorods in aqueous solution, was synthesized. Interestingly, upon the addition of natural cyclodextrin, the nanorods could transform into bilayer vesicles, which were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), dynamic light scattering (DLS), and epi-fluorescence microscopy (EFM). A transformation mechanism is suggested based on the results of 1H NMR, 2D NMR ROESY, FTIR, and UV-vis spectra. The response of the vesicles to changing pH and adding Cu2+ was also tested. Our research may pave the way to the development of new intelligent materials and biomaterials. © 2010 Elsevier Ltd. All rights reserved. Source

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