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| 1 | Effect of chemical corrosion on charge transport behaviour in epoxy/Al_(2)O_(3)nanocomposite irradiated by gamma ray显示文摘Chemical corrosion and gamma‐ray irradiation appeared with the loss of coolant accident may seriously threaten the safe operation of a nuclear power plant,where epoxy resin(ER)‐based materials are widely used.It is urgent to study the effects of the corrosion and the irradiation on the electrical performance in an ER‐based nanocomposite.In this work,ER/Al_(2)O_(3)nanocomposite samples with 0,1,3,5‐wt%nano Al2O3 filler content were prepared at the thickness of 2 mm,and the total gamma irradiation dose was 0,500,and 1000 kGy.The samples were chemically corroded in a boric acid solution(pH=4.7)and a trisodium phosphate alkaline solution(pH=11)at 60℃and 100℃for 48 h.Charge transport behaviour in the samples was derived from the surface potential decay method.In addition,the sample structures were characterised to analyse the corrosion mechanism in the solutions.The results indicated that the depth and the density of the trap showed a temperature‐dependent manner associated with the corrosion.With the addition of appropriate content of the filler,the trap centre was deepened and the carrier mobility was limited even after the corrosion.It is found that the appearance of hydroxyl and carboxyl groups during corrosion,the interaction between the nanoparticle and the matrix and the crosslinking reaction caused by the irradiation are responsible for the variation in charge transport behaviour. | Yu Gao Jing Li Bangbang Xu Binyuan Ye Boxue Du | 2022 | High Voltage2022，7，1： | 4 |
| 2 | Effects of calcination temperature and Li^+ ions doping on structure and upconversion luminescence properties of TiO_2:Ho^(3+)-Yb^(3+) nanocrystals显示文摘Ho^(3+)-Yb^(3+) co-doped and Ho^(3+)-Yb^(3+)-Li^+ tri-doped TiO_2 nanocrystals were prepared using the sol-gel method. Effects of the calcination temperature and Li^+ ions doping on the structure and upconversion luminescence properties of Ho^(3+)-Yb^(3+) co-doped TiO_2 nanocrystals were investigated. The upconversion luminescence of nanocrystals was enhanced with the reduction of the crystal lattice symmetry and the crystallinity improvement of the matrix, which were facilitated by the calcination temperature change and Li^+ ions doping. The lowest lattice symmetry and the best crystallinity of the matrix resulted in the maximum luminescence intensity. | Kaishun Zou Guangzong Dong Juncheng Liu Boxu Xu Danping Wang | 2019 | Journal of Materials Science & Technology2019，35，4： | 1 |
| 3 | Dimension-Enhanced Ultra-High Performance Liquid Chromatography/Ion Mobility-Quadrupole Time-of-Flight Mass Spectrometry Combined with Intelligent Peak Annotation for the Rapid Characterization of the Multiple Components from Seeds of Descurainia sophia显示文摘The complex composition of herbal metabolites necessitates the development of powerful analytical techniques aimed to identify the bioactive components.The seeds of Descurainia sophia(SDS)are utilized in China as a cough and asthma relieving agent.Herein,a dimension-enhanced integral approach,by combining ultra-high performance liquid chromatography/ion mobility-quadrupole time-of-flight mass spectrometry(UHPLC/IMQTOF-MS)and intelligent peak annotation,was developed to rapidly characterize the multicomponents from SDS.Good chromatographic separation was achieved within 38 min on a UPLC CSH C18(2.1×100 mm,1.7μm)column which was eluted by 0.1%formic acid in water(water phase)and acetonitrile(organic phase).Collision-induced dissociation-MS^(2)data were acquired by the data-independent high-definition MS^(E)(HDMS^(E))in both the negative and positive electrospray ionization modes.A major components knockout strategy was applied to improve the characterization of those minor ingredients by enhancing the injection volume.Moreover,a self-built chemistry library was established,which could be matched by the UNIFI software enabling automatic peak annotation of the obtained HDMS^(E)data.As a result of applying the intelligent peak annotation workflows and further confirmation process,a total of 53 compounds were identified or tentatively characterized from the SDS,including 29 flavonoids,one uridine derivative,four glucosides,one lignin,one phenolic compound,and 17 others.Notably,four-dimensional information related to the structure(e.g.,retention time,collision cross section,MS^(1)and MS^(2)data)was obtained for each component by the developed integral approach,and the results would greatly benefit the quality control of SDS. | Simiao Wang Xue Li Boxue Chen Shitong Li Jiali Wang Jing Wang Mingshuo Yang Xiaoyan Xu Hongda Wang Wenzhi Yang | 2022 | Phyton-International Journal of Experimental Botany2022，91，3： | 1 |
| 4 | Effects of the annealing temperature on the structure and up-conversion photoluminescence of ZnO film显示文摘The up-conversion film is being tried to increase the photoelectric conversion efficiency of the silicon solar cell. To improve the efficiency of the photoluminescence film, the effects of the annealing temperature were investigated on the structure and photoluminescence of the ZnO up-conversion film, which was prepared using the sol-gel method and the spin-coating technique. The results show that the organic compounds and water in the ZnO film were completely eliminated when the annealing temperature reached 500 ℃. The crystallinity of film is improved and the average grain size continuously increases as increasing the annealing temperature. The transmittance in the wavelength range of 400-2000 nm continuously increases as the annealing temperature increases from 500 ℃ to 700 0 C, whilst it decreases first and then increases as the annealing temperature increases from 800 ℃ to 1000℃. When the film is excited with a laser of 980 nm, there are two intense emission bands in the up-conversion emission spectra, 542-nm green light and 660-nm red light, corresponding to Ho^(3+):~5 S_2/~5 F_4→~5 I_8 and ~5 F_5→~5 I_8 transitions, respectively. In addition, the intensity of up-conversion luminescence for the film increases first and then decreases with the increase of the annealing temperature. When the annealing temperature is at 900 ℃, the film consists of small round compact particles with a high degree of crystallization,reaching maximum up-conversion intensity of the film. | Xiaoqi Meng Changjiang Zhao Boxu Xu Pei Wang Juncheng Liu | 2018 | Journal of Materials Science & Technology2018，34，12： | 0 |
| 5 | Effects of nanofiller and voltage stabilizer on partial discharge resistance of polypropylene/elastomer blends:A comparison study显示文摘This paper reports on the individual and synergistic influence mechanisms of nano-silica(SiO_(2))and voltage stabilizers on partial discharge(PD)resistance of polypropylene blended with ethylene-octene copolymer elastomer.The SiO_(2)nanoparticles and three types of voltage stabilizers,that is,benzoin,4,40-dimethoxybenzil,and 3-aminobenzoic acid are selected as fillers to prepare samples.PD is initiated in a rod-to-plane electrode system with an alternating current voltage of 5 kVrms.PD characteristics are captured with multi-sensors,and the erosion profile of the test sample is measured using a three-dimensional(3D)optical profilometer.Carrier trap distribution is extracted with isothermal surface potential decay measurement to assist the analysis of PD eroding material.Fourier transform infrared spectrum,scanning electron microscopy,X-ray diffraction spectrum,and differential scanning calorimetry analysis are performed to reveal the change in material structures caused by the fillers.Test results indicate that the PD resistance of the blend can be improved by the addition of nano-SiO_(2)and voltage stabilizers individually and synergistically.The PD resistance of PO is increased by 71.2%at most in the sample with 3 wt%nano-SiO_(2)addition.The sample filled with SiO_(2)exhibits better PD resistance than that with the voltage stabilizer or co-added,which should be ascribed to the introduction of deep traps,the formation of the packaged layer,the suppression of oxygen diffusion of the nanofillers,and the good compatibility between additives and the polymer matrix. | Yu Gao Jing Li Xuri Xu Jinjing Peng Tao Han Boxue Du | 2023 | High Voltage2023，8，2： | 0 |
| 6 | Effect of Y:Zn ratio on microstructure and emission of Er^(3+)/Yb^(3+) codoped Y_(2)O_(3)-ZnO ceramic phosphors显示文摘In this study,Er^(3+)/Yb^(3+)codoped Y_(2)O_(3)-ZnO ceramic phosphors were prepared by sol-gel method.The samples had two emission bands,namely,green(535 nm) and red(660 nm),which are attributed to Er^(3+):^(2)H_(11/2)(^(4)S_(3/2))→^(4)I_(15/2)and Er^(3+):^(4)F_(9/2)→^(4)I_(15/2)radiative transitions,respectively.The samples exhibited green-and red-emission intensity enhancement by 1.728 and 2.286 times that of the pure Y2O3host,respectively and by 514.468 and 214.341 times that of the pure ZnO host.The emission intensities are first enhanced by lattice expansion.With the change of Y:Zn ratio,the high surface energy is converted into low crystal surface resulting in the change of asymmetry crystal field for matrix.When the intensity of the asymmetric crystal field reaches maximum,both emissions are further boosted.When the high surface energy transforms into crystal surface energy,the microstructure changes into a compact mesoporous structure.Consequently,the chemical stability of the samples improves significantly,and the final emission band of the three samples with mesoporous structures is continuously red. | Boxu Xu Chao Song Jie Song Rui Huang Shaomin Lin Zhenxu Lin Yi Zhang Dejian Hou Jun Song | 2023 | Journal of Rare Earths2023，41，12： | 0 |
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