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76 results on '"Liu, Jingkai"'

55. Synthesis of a fire-retardant and high Tgbiobased polyester from 2,5-furandicarboxylic acid

Author

Fei, Xuan, Zhang, Xiaoqin, Liu, Jingkai, Wang, Jinggang, and Liu, Xiaoqing

Abstract

A biobased diol (BDBE) is synthesized from vanillin, guaiacol, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) to generate a series of fire-retardant polyesters (PECBFs) via melt polymerization with ethylene glycol (EG), 1,4-cyclohexanedimethanol (CHDM), and 2,5-furandicarboxylic acid (FDCA). The chemical structure, sequence distribution, and molecular weights of the obtained polyesters are confirmed by nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). The results show that BDBE units contribute positively to the high glass transition temperature (Tg) and fire retardancy, while the CHDM moiety provides flexibility and chain propagation activity. As the content of BDBE is increased from 0 to 25%, the Tgof PECBFs increases from 82 to 95 °C, and the limiting oxygen index (LOI) increases from 22.4 to 27.5%. In the UL-94 combustion test, when BDBE units are more than 15%, the samples almost self-extinguish immediately once the flame is moved away. Their mechanical properties are also investigated, and their tensile modulus is stabilized between 1.7 and 1.8 GPa, while the elongation at break ranges from 5 to 56%. Biobased polyesters demonstrating satisfactory properties are reported in this work.

Published
2022
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59. Oscillation suppression for W-band folded waveguide traveling wave tube

Author

潘攀 Pan Pan, 胡银富 Hu Yinfu, 蔡军 Cai Jun, 冯进军 Feng Jinjun, 杜英华 Du Yinghua, 唐烨 Tang Ye, 邬显平 Wu Xianping, and 刘京恺 Liu Jingkai

Subjects
Physics, Optics, W band, law, business.industry, Oscillation, Waveguide (acoustics), Electrical and Electronic Engineering, Traveling-wave tube, business, Atomic and Molecular Physics, and Optics, law.invention
Published
2013
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66. W-band 100W pulsed TWT amplifiers for power combining experiment

Author

Feng, Jinjun, primary, Cai, Jun, additional, Wu, Xianping, additional, Hu, Yinfu, additional, Cui, Yanjun, additional, Du, Yinghua, additional, Dong, Ruitong, additional, Liu, Jingkai, additional, Chen, Ji, additional, Zhang, Xiaoqing, additional, Tong, Yi, additional, and Li, Yunhai, additional

Published
2014
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67. Progress of wide bandwidth W-band 20W CW TWT

Author

Hu, Yinfu, primary, Feng, Jinjun, additional, Liu, Jingkai, additional, Cai, Jun, additional, Du, Yinghua, additional, Dong, Ruitong, additional, Chen, Ji, additional, Zhang, Xiaoqing, additional, Li, Shijing, additional, Li, Tianyi, additional, and Wu, Xianping, additional

Published
2014
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70. A highly sensitive and selective fluorescent probe for fluoride anions based on intramolecular charge transfer.

Author

Liu, Jingkai, Xu, Zhenghe, Liu, Caiyun, Xu, Lirong, Wang, Zhongpeng, and Zhu, Baocun

Abstract

Currently, there is a great need to develop methods for the selective detection of fluoride anions (F-) owing to their toxicity in the environment and biological function in living systems. In this study, we developed a new fluorescent probe (probe 1) employing a Si-O bond as a highly selective recognition receptor for detecting F- via intramolecular charge transfer. Probe 1 could detect F- quantitatively using the turn-on fluorescence spectroscopy method with excellent sensitivity in the range of 4-38 μM and a detection limit of 0.26 μM; the detection time was < 17 min. We anticipate that probe 1 would be used widely to monitor F- in the environment. Copyright © 2015 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2016
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72. Research of millimeter wave and Terahertz vacuum devices in NKLST-VE

Author

Wei, Yanyu, primary, Gong, Y. B., additional, Duan, Z. Y., additional, Gong, H. R., additional, Yue, L. N., additional, Yin, H. R., additional, Lu, Z., additional, Xu, Jin, additional, Huang, M., additional, Zhao, G. Q., additional, Tang, T., additional, Wang, Z. L., additional, Wang, W. X., additional, Xiong, X., additional, Lai, J. Q., additional, Liu, Y., additional, Shen, F., additional, Liu, Yang, additional, Guo, G., additional, Tian, Y. Y., additional, Feng, Jinjun, additional, Cai, Jun, additional, Hu, Yinfu, additional, Wu, Xianping, additional, Tang, Ye, additional, Du, Yinghua, additional, Pan, Pan, additional, Liu, Jingkai, additional, and Liao, Fujiang, additional

Published
2012
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74. A 75-kW methanol reforming fuel cell system

Author

Yan, Xiqiang, primary, Wang, Shudong, additional, Li, Xiangyi, additional, Hou, Ming, additional, Yuan, Zhongshan, additional, Li, Deyi, additional, Pan, Liwei, additional, Zhang, Cheng, additional, Liu, Jingkai, additional, Ming, Pingwen, additional, and Yi, Baolian, additional

Published
2006
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75. A Method for the Highly Selective, Colorimetric and Ratiometric Detection of Hg2+in a 100% Aqueous Solution

Author

Liu, Jingkai, Xu, Zhenghe, Xu, Lirong, Bian, Zhen, Sang, Guoqing, and Zhu, Baocun

Abstract

Mercury (Hg) and its derivatives pose a serious threat to the environment and human health. Thus, the development of methods for the selective and sensitive determination of Hg2+is very important to understand its distribution, and to implement more detailed toxicological studies. Herein, we developed a new method for the detection of Hg2+based on the tricyanoethylene derivative and mercaptoethanol. This method could selectively detect Hg2+in a 100% aqueous solution by the naked-eye within the range of 1 – 60 μM. Importantly, this method also could detect Hg2+quantitatively by ratiometic absorption spectroscopy in the range of 0.1 – 6 μM with a detection limit of 55 nM. We anticipate that this proposed method will be used widely to monitor Hg2+in the environment.

Published
2016
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76. A highly sensitive and selective fluorescent probe for fluoride anions based on intramolecular charge transfer.

Author

Liu J, Xu Z, Liu C, Xu L, Wang Z, and Zhu B

Subjects
Anions analysis, Fluorescent Dyes chemical synthesis, Molecular Structure, Oxygen chemistry, Silicon chemistry, Spectrometry, Fluorescence, Fluorescent Dyes chemistry, Fluorides analysis, Fluorides chemistry
Abstract

Currently, there is a great need to develop methods for the selective detection of fluoride anions (F(-) ) owing to their toxicity in the environment and biological function in living systems. In this study, we developed a new fluorescent probe (probe 1) employing a Si-O bond as a highly selective recognition receptor for detecting F(-) via intramolecular charge transfer. Probe 1 could detect F(-) quantitatively using the turn-on fluorescence spectroscopy method with excellent sensitivity in the range of 4-38 μM and a detection limit of 0.26 μM; the detection time was < 17 min. We anticipate that probe 1 would be used widely to monitor F(-) in the environment. Copyright © 2015 John Wiley & Sons, Ltd., (Copyright © 2015 John Wiley & Sons, Ltd.)

Published
2016
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