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Qiu, Jijun,Weng, Binbin,Zhao, Lihua,Chang, Caleb,Shi, Zhisheng,Li, Xiaomin,Kim, Hyung-Kook,Hwang, Yoon-Hwae Hindawi Limited 2014 Journal of nanomaterials Vol.2014 No.-
<P>Flower-like bundles of ZnO nanosheets have been prepared by using preheating hydrothermal process without any surfactants. The flower-like bundles consist of many thin and uniform hexagonal-structured ZnO nanosheets, with a thickness of 50 nm. The selected area electronic diffraction (SAED) and high-resolution transmission electron microscope (HRTEM) images indicate that the ZnO nanosheets are single crystal in nature. The growth mechanism of the flower-like bundles of ZnO nanosheets is discussed based on the morphology evolution with growth times and reaction conditions. It is believed that the formation of flower-like bundles of ZnO nanosheets is related to the shielding effect of OH<SUP>−</SUP>ions and the self-assembly process, which is dominated by a preheating time. Room temperature photoluminescence spectra results show that the annealing atmosphere strongly affects the visible emission band, which is sensitive to intrinsic and surface defects, especially oxygen interstitials, in flower-like bundles of ZnO nanosheets.</P>
Preparation and evaluation of enrofloxacin microspheres and tissue distribution in rats
Fan Yang,Jijun Kang,Fang Yang,Zhensheng Zhao,Tao Kong,Zhenling Zeng 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.2
New enrofloxacin microspheres were formulated, and their physical properties, lung-targeting ability, and tissue distribution in rats were examined. The microspheres had a regular and round shape. The mean diameter was 10.06 μm, and the diameter of 89.93% of all microspheres ranged from 7.0 μm to 30.0 μm. Tissue distribution of the microspheres was evaluated along with a conventional enrofloxacin preparation after a single intravenous injection (7.5 mg of enrofloxacin/kg bw). The results showed that the elimination half-life (t1/2β) of enrofloxacin from lung was prolonged from 7.94 h for the conventional enrofloxacin to 13.28 h for the microspheres. Area under the lung concentration versus time curve from 0 h to ∞ (AUC0-∞) was increased from 11.66 h·μg/g to 508.00 h·μg/g. The peak concentration (Cmax) in lung was increased from 5.95 μg/g to 93.36 μg/g. Three lung-targeting parameters were further assessed and showed that the microspheres had remarkable lung-targeting capabilities.
Mechanism of Ce promoting SO2 resistance of MnOx/γ-Al2O3: An experimental and DFT study
Xiaopeng Zhang,Zhuofeng Li,Jijun Zhao,Yuezong Cui,Bojian Tan,Jinxin Wang,Chengxiang Zhang,Gaohong He 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.7
Various physico-chemical techniques and theoretical chemistry computations are used to obtain a deep insight into the mechanism of Ce improving SO2 resistance of the catalyst Mn0.4Cex/Al2O3 (x stands for the molar ratio of Ce : Al). Theoretical computation with density functional theory (DFT) shows that Ce modification enhances the adsorption energy of SO2 adsorbed on Ce surrounding, resulting in the preferential adsorption of SO2 on Ce surrounding. It protects the surface Mn from SO2 poisoning, leading to a better SO2 resistance. FT-IR and TG results are in good accordance with DFT results. FT-IR results suggest that absorption peaks related to SO4 2− cannot be detected in Mn0.4Ce0.12/Al2O3. Moreover, TG results show that weight loss peaks due to sulfated MnOx decomposition disappears after Ce addition. Therefore, Ce modification inhibits sulfates formation on active components lead to a better resistance to SO2 of Mn0.4Ce0.12/Al2O3.
U-phosphate biomineralization induced by Bacillus sp. dw-2 in the presence of organic acids
Hong Tu,Guoyuan Yuan,Changsong Zhao,Jun Liu,Feize Li,Jijun Yang,Jiali Liao,Yuanyou Yang,Ning Liu 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.5
In this paper, we systematically investigated the influence of some selected ligands on the U-phosphateprecipitation induced by soil bacteria. These organics are widely ranging from acetate, lactate, salicylateand citrate to oxalate. The results revealed that uranium could be biomineralized on bacteria asUO2HPO4$4H2O or (UO2)3(PO4)2$4H2O. The influence of organic ligands on the biomineralization hadclear-cut correlations with its complexation abilities to uranyl. It was clearly found that the U-phosphatebiomineralization was affected noticeably by the strong ligands (oxalate and citrate). Further studydiscovered that when the organic ligands were uncompetitive with biotic PO4 3 for uranyl, the transformationof uranyl species from b-UO2(OH)2 colloidal particles to free UO2 2 þ-ligands ions could facilitatethe U-phosphate biomineralization. However, when the organic ligands competed with biotic PO4 3 foruranyl, the U-phosphate biomineralization were inhibited. Our results highlight the importance ofcomplex interactions of strong organic ligands with uranyl during the bacterial precipitation of UePcompounds and thus for the mobilization and immobilization of radio-nuclides in the nature.
Multiscale Simulation of Yield Strength in Reduced-Activation Ferritic/Martensitic Steel
Chenchong Wan,Chi Zhang,Zhigang Yang,Jijun Zhao 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3
One of the important requirements for the application of reduced-activation ferritic/ martensitic (RAFM) steel is to retain proper mechanical properties under irradiation and high-temperature conditions. To simulate the yield strength and stress-strain curve of steels during high-temperature and irradiation conditions, a multiscale simulation method consisting of both microstructure and strengthening simulations was established. The simulation results of microstructure parameters were added to a superposition strengthening model, which consisted of constitutive models of different strengthening methods. Based on the simulation results, the strength contribution for different strengthening methods at both room temperature and high-temperature conditions was analyzed. The simulation results of the yield strength in irradiation and high-temperature conditions were mainly consistent with the experimental results. The optimal application field of this multiscale model was 9Cr series (7-9 wt.%Cr) RAFM steels in a condition characterized by 0.1-5 dpa (or 0 dpa) and a temperature range of 25-500℃.
Huixin Xiu,Yang Zhang,Jiajia Fu,Zhanhong Ma,Lixia Zhao,Jijun Feng 한국물리학회 2019 Current Applied Physics Vol.19 No.1
Degradation mechanism of 265-nm deep ultraviolet light emitting diodes (UV-LEDs) has been investigated by means of electroluminescence, current-voltage measurement, capacitance-voltage measurement, and transmission electron microscopy (TEM) equipped with energy dispersive X-ray spectrometer (EDAX). It is revealed that a major degradation mode of UV-LEDs may be the leakage current induced optical degradation. The current pathway is demonstrated by TEM with EDAX, indicating that the contact metals can partially interact with ptype materials, which accelerate the degradation of LEDs. The presented results can help to understand the degradation mechanisms and improve the reliability of deep UV-LEDs.
Zhang, Han,He, Hanyi,Liu, Jun,Li, Honghui,Zhao, Shuaiwei,Jia, Meilan,Yang, Jijun,Liu, Ning,Yang, Yuanyou,Liao, Jiali Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1
The europium sorption on Tamusu clay was investigated by batch sorption experiments and spectroscopic study under the condition of strong ionic strength. The results demonstrated that europium sorption on Tamusu clay increased rapidly with pH value, but decreased with the ionic strength of solution increased. The europium sorption also increased in the presence of humic acid, especially at low pH value. The sorption could be fitted by Freundlich isotherm model and the europium sorption on clay was spontaneous and endothermic reaction. Besides, the result indicates that ion exchange was the main process at low pH value, while inner-sphere surface complexation dominated the sorption process at high pH value. The Backscatter electron scanning/Energy Dispersive Spectrometer(BSE/EDS) and the effect of Na for europium sorption results further suggested that europium sorption on Tamusu clay mainly competed with Na at low pH value. Overall, the results in this research were of significance to understand the sorption behavior of europium on the geological media under high ionic strength.