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Start Over Author "Liu, Qinghao" Publisher elsevier bv
15 results on '"Liu, Qinghao"'

9. Preparation and characterization of functional near ultraviolet fluoresent microspheres

Author

Li-Na Liang, Liu Qinghao, Yan-Fei He, Guo Jinchun, Dong Liang, Hu Zhiyong, Liu Hongyan, and Nan Shi

Subjects
Dispersion polymerization, Carbazole, Process Chemistry and Technology, General Chemical Engineering, Polyacrylamide, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Fluorescence, 0104 chemical sciences, chemistry.chemical_compound, Monomer, chemistry, Proton NMR, Fluorescence microscope, Polystyrene, 0210 nano-technology, Nuclear chemistry
Abstract

The polymerisable fluorescent monomer, allyl carbazole, was synthesized from carbazole and characterized using FT-IR spectra, 1H NMR and fluorescence spectra. Using allyl carbazole as fluorescent dye, carboxyl polystyrene fluoresent microspheres, polyacrylamide fluorescent microspheres and polystyrene fluoresent microspheres with sulfonic groups with narrow particle size were prepared by dispersion polymerization. These fluorescent microspheres were characterized by SEM, fluorescence microscopy, FT-IR spectroscopy, the conductivity, fluorescence spectrophotometry and UV-vis spectrometer. The results indicated that the three kinds of fluorescent microspheres with good dispersion and stability and high blue fluorescence intensity were obtained. And carboxyl groups, sulfonic groups and amino groups were successfully introduced on the surface, whose contents were approximately 45, 90 and 60 μmol g−1, respectively. Furthermore, the characteristics of allyl carbazole should be maintained in the fluorescent microspheres, the difference of the spectra between fluorescent microspheres and allyl carbazole in ethanol and toluene were also proved.

Published
2018

12. Effect of characteristics of inferior residues on thermal coke induction periods

Author

Zongxian Wang, Yu-xuan Geng, Aijun Guo, Xiang-qin Lin, Ruo-meng Li, Jiao Shouhui, Jia-jun Tong, Liu Qinghao, and Kun Chen

Subjects
Reaction conditions, 010405 organic chemistry, Chemistry, Induction period, Metallurgy, technology, industry, and agriculture, 02 engineering and technology, Coke, Raw material, complex mixtures, 01 natural sciences, respiratory tract diseases, 0104 chemical sciences, Stability parameter, Colloid, 020401 chemical engineering, Thermal, Delayed coker, 0204 chemical engineering
Abstract

Using 4 inferior residual oils as raw materials, the effect of feedstock properties on the characteristics of coke formation during initial thermal conversion process was studied. The results show that the influence for coke induction period of different oils affected by temperature can be measured with the sensitivity parameters. The shorter the coke induction period of the residue, the bigger the sensitivity parameter. The coke induction period has a higher decrease rate with the reaction temperature rising. The coke formation property generally depends on feedstock's basic properties, and the influence of various properties of inferior residual oils on coke formation is different under the same reaction conditions. Carbon residue, ash, relative molecular mass, asphaltene precipitation onset point and stability parameter have strong correlations with the coke induction period, especially for the colloidal stability of oil reflected by asphaltene precipitation onset point and stability parameter. The colloidal stability of the inferior residual oils is related to the coke formation characteristics. The worse the stability of the residue, the more likely the coke is to form. The coke forming process is a gradual destruction of the colloid system during thermal reaction.

Published
2017

13. Development and validation of a novel diagnostic nomogram model based on tumor markers for assessing cancer risk of pulmonary lesions: A multicenter study in Chinese population

Author

Du, Qiang, primary, Yan, Cunling, additional, Wu, San-Gang, additional, Zhang, Wei, additional, Huang, Chun, additional, Yao, Yiyong, additional, Wang, Liyu, additional, Zhang, Qunji, additional, Liu, Qinghao, additional, Guan, Jie, additional, Hou, Yanfeng, additional, Li, Zhiyan, additional, Soh, Andrew, additional, Beshiri, Agim, additional, Wang, Qi, additional, Li, Xun, additional, Zheng, Yijie, additional, and Wang, Huiling, additional

Published
2018
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