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Non-isothermal Kinetics of Pyrolysis of Three Kinds of Fresh Biomass 被引量:10
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作者 MIN Fan-fei ZHANG Ming-xu CHEN Qing-ru 《Journal of China University of Mining and Technology》 EI 2007年第1期105-111,共7页
The pyrolysis kinetics of three different kinds of fresh biomass (grass: triple A, wheat straw, corn straw) in nitrogen flow were studied by thermogravimetric analysis at five different heating rates. The kinetic para... The pyrolysis kinetics of three different kinds of fresh biomass (grass: triple A, wheat straw, corn straw) in nitrogen flow were studied by thermogravimetric analysis at five different heating rates. The kinetic parameters of the pyrolysis process were calculated using the method of Ozawa-Flynn-Wall and the mechanism of reactions were investi- gated using the method of Popescu. It was found that the values of activation energy varied in different temperature ranges. The pyrolysis processes are well described by the models of Zhuravlev (Zh) and valid for diffusion-controlled between 200 ℃ and 280 ℃, by Ginstling-Brounshtein (G-B), valid for diffusion-control between 280 ℃ and 310 ℃, for first-order chemical reaction between 310℃ and 350 ℃, by Zhuravlev (Zh) valid for diffusion-control between 350 ℃ and 430 ℃ and by the one-way transport model when temperatures are over 430 ℃. 展开更多
关键词 non-isothermal kinetics fresh biomass PYROLYSIS thermogravimetric analysis
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Strong optical nonlinearities of self-assembled polymorphic microstructures of phenylethynyl functionalized fluorenones 被引量:2
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作者 Xinyue Li Sergey Semin +8 位作者 Leandro A. Estrada Chunqing Yuan Yulong Duan Jonathan Cremers Paul Tinnemans Paul Kouwer Alan E. Rowan Theo Rasing Jialiang Xu 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第2期297-300,共4页
Highly efficient nonlinear optical(NLO) materials with well-defined architectures in the wavelength and subwavelength length scales are of particular importance for next generation of integrated photonic circuits. F... Highly efficient nonlinear optical(NLO) materials with well-defined architectures in the wavelength and subwavelength length scales are of particular importance for next generation of integrated photonic circuits. Fluorenone analogues have been demonstrated to be promising candidates as building blocks for assembly of organic NLO materials thanks to their synergistic supramolecular interactions and brilliant optical properties. Here we have studied the polymorphs of a phenylethynyl functionalized fluorenone derivative, and their controlled self-assembly for microstructures with different morphologies. These polymorphic microcrystals exhibit very distinctive NLO properties, highly related to their supramolecular and electronic structures. 展开更多
关键词 Nonlinear optics Second harmonic generation Two-photon excited fluorescence Transition dipole Fluorenone
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