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Preparation of Ce3+doped Bi2O3 hollow needle-shape with enhanced visible-light photocatalytic activity

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Journal of Rare Earths 2019年第7期37卷 726-731页

作者： wenwen zhang Shaomin Gao Donghui Chen College of Environmental Science and Engineering Donghua UniversityShanghai 201620China College of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China

Ce3+ doped Bi2O3 hollow needle-shape with enhanced visible-light photocatalytic activity was successfully prepared via the method of chemical precipitation using Bi(NO3)·5H2O and Ce(NO3)3·6H2O as the source of bismuth and cerium, HNO3 as solvent and NaOH as precipitants, respectively and after calcination at 500 ℃ for 2 h. The morphology and elemental composition,crystal form,purity and specific surface area of the hollow needle Bi2O3 were characterized by SEM-EDS, XRD, BET and FT-IR. The photocatalytic properties of the as-obtained samples were measured by UV-vis diffuse reflection spectroscopy and photochemical reactor. As a result, the obtained Bi2O3 hollow needle-shape doped with 5 wt% Ce shows good morphology, α-phase, stronger absorbent for visible light and good photocatalytic property. Under the simulated visible light of 300 W, the photodegradation rate of tetracycline over HNBCe can reach to 89.1%,which is higher than that of commercial Bi2O3 nanoparticles and Bi2O3 hollow needle-shape.

关键词： Needle-shape Bi2O3 Precipitation method Tetracycline Rare earths

Dip-coating of Superhydrophobic Surface on Irregular Substrates for Dropwise Condensation

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Journal of Bionic Engineering 2021年第2期18卷 387-397页

作者： Zhen Xiao Da Xu wenwen zhang Xinquan Yu Youfa zhang Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China

Herein,self-assembled superhydrophobic composite coatings were successfully prepared using a one-step dip-coating method on different irregular *** fluorinated nano-SiO_(2) particles spread into a uniform layer owing to the viscosity of the composite *** the optimization of the process,the fabricated nanoporous-structured coating has low adhesion properties with chemical and high thermal *** baking at 250℃ for 2 h or soaking in a solution of pH=1 or pH=13 for 10 days,the coating could maintain its good *** self-ejecting effects of the condensed dewdrops and droplet bounce phenomenon indicate that the coatings can be well-distributed on components of different structures,and they have significant application prospects in irregular parts and industrial production in the near future.

关键词： superhydrophobic dip-coating self-assembled dropwise condensation irregular parts

Magnetic composite Fe3O4/CeO2 for adsorption of azo dye

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Journal of Rare Earths 2018年第9期36卷 986-993页

作者： Shaomin Gao wenwen zhang Huiping Zhou Donghui Chen College of Chemical and Environmental Engineering Shanghai Institute of Technology.Shanghai 201418China College of Environmental Science and Engineering.Donghua University.Shanghai 201620 China

In this paper,magnetic composite Fe3 O4/CeO2（MC Fe/Ce） was synthesized via CeO2 covered onto the surface of Fe3O4 by sol-precipitation *** as-synthesized samples were characterized by FE-SEM,XRD,SEM-EDS and FT-IR *** pseudo-second-order（PSO） kinetic can describe well the adsorption of Acid black 210（AB210） onto the as-obtained MC Fe/Ce of which the adsorption isotherm fits the Langmuir adsorption model better than Freundlich adsorption ***,the maximum monolayer adsorption capacity of MC Fe/Ce is about 93 mg/g,which is 6 times more than that of commercial CeO2 for ***,the removal rate of the adsorbates for AB210 is 82.3% after first adsorption and still about 70% the fourth forth adsorption experiments within 120 min,which demonstrates that the obtained MC Fe/Ce has outstanding adsorption capacity and good ***,the composite can be easily separated from aqueous solution in a few seconds with an external magnetic field due to its magnetic property,which is vital and has potential for its practical applications.

关键词： Magnetic Adsorption Fe3O4/CeO2 Sol-precipitation AB 210 Rare earths

Thermal Stability of Typical Superhydrophobic Surfaces

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Journal of Bionic Engineering 2018年第6期15卷 1025-1034页

作者： Zhen Xiao Liqing zhang wenwen zhang Xinquan Yu Youfa zhang Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China

Two kinds of typical superhydrophobic surfaces, ZnO nanorods and porous nano-SiO2 coating were successfully prepared on nickel alloy plates using a wet chemical method for the ZnO nanorods and spraying for the nano-SiO2 coating. Thermal stability of each of the superhydrophobic surfaces was tested. Scanning Electron Microscopy （SEM） and energy dispersive spectrometry were used to analyze microstructures and compositions. Although both superhydrophobic surfaces show similar wettability with respect to water, the SiO2 Nanoparticles Superhydrophobic Coatings （SiO2-NSCs） has better thermal stability than the ZnO Nanorods Superhydrophobic Coatings （ZnO-NSCs）. The micro/nano structures of the two superhydrophobic surfaces can be destroyed during icing-melting cycles. In addition, at high temperature, the superhydrophobic properties of the surface can be destroyed because of the decomposition of fluorinated silane. The results can provide guidance for the practical cryogenic application of superhydrophobic surfaces.

关键词： anti-frosting superhydrophobic ZnO nanorods SiO2 coating thermal stability

The Effect of Send/Receive Dual Channel Parameters on Polarization Parameters Measurement

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Chinese Journal of Electronics 2017年第2期26卷 336-344页

作者： zhang wenwen YIN Fulian CHAI Juanfang BAI Xuesong Beijing Aerospace System Engineering Institute Information Engineering School Communication University of China Shanghai Electromechanical Engineering Institute

The dual-linear polarization radar is what China will popularize gradually following the Doppler radar *** the Doppler radar technology,the dual-linear polarization radar,which has been widely applied to enhancing modem weather radar system,becomes more and more popular in *** characteristics of hydrometeors,such as differential reflectivity,specific differential phase,and zero-lag correlation coefficient,are usually provided by the *** by the angular orientation of the feed,drop canting,and backscatter depolarization,however,inevitable measurement errors exit because of the unwanted horizontal and vertical wave *** small errors in these sensitive parameters may lead to erroneous judgment,both the factors themselves and their weights of influence should be studied specifically,with the mode of simultaneous transmission and reception of horizontally and vertically polarized *** study provides theoretical basis for the design of dual polarization Doppler radar,and will be helpful in the research of cloud,precipitation physics,and weather modification.

关键词： Doppler radar Dual-polarization technology Weather modification Elliptically polarized light Send/receive

Surface manipulation of a triple-conducting cathode for protonic ceramic fuel cells to enhance oxygen reduction activity and CO_(2) tolerance

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Journal of Energy Chemistry 2023年第12期87卷 450-459,I0012页

作者： wenwen zhang Hiroki Muroyama Yuichi Mikami Toshiaki Matsui Koichi Eguchi Department of Energy and Hydrocarbon Chemistry Graduate School of EngineeringKyoto UniversityNishikyo-kuKyoto 615-8510Japan Technology Division Panasonic Holdings Corporation3-1-1 Yagumo-naka-machiMoriguchi CityOsaka 570-8501Japan

One of the main obstacles limiting the performance of protonic ceramic fuel cells(PCFCs) is the sluggish kinetics of the oxygen reduction reaction(ORR) at reduced ***,the surface manipulation of a triple-conducting cathode BaCe_(0.5)Pr_(0.3)Y_(0.2)O_(3-δ)(BCPY) by an efficient catalyst coating PrNi_(0.5)Co_(0.5)O_(3-δ)(PNC) to enhance the ORR activity and CO_(2) tolerance is *** developed PNC-coated BCPY cathode achieves the polarization resistance of 0.25 and 1.00 Ω cm^(2) at 600 and 500 ℃,respectively,approximately 1/5 of that for the pristine BCPY cathode(0.99 and 4.79 Ω cm^(2)),while maintaining an excellent CO_(2) *** single cell on a BaZr_(0.8)Yb_(0.2)O_(3-δ) electrolyte also exhibits a high peak power density of 0.79 W cm^(-2)at 700 ℃ and a stable operation for 200 h at 600 ℃.Such high ORR activity is mainly attributed to the synergistic effect of BCPY support and PNC ***,BCPY provides a tripleconducting path(mainly protons),and PNC nanoparticles facilitates surface oxygen exchange and steam adsorption/desorption processes due to the enriched surface oxygen *** study will provide a new design strategy for developing high-performance PCFCs cathode.

关键词： Triple-conducting cathode Surface manipulation Oxygen reduction reaction CO_(2)tolerance Protonic ceramicfuel cells

Determination of the solubility parameter of cellulose acrylate using inverse gas chromatography

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Chinese Science Bulletin 2007年第22期52卷 3051-3055页

作者： ZHAO Shu zhang Fei zhang wenwen SHI BaoLi Heilongjiang Key Laboratory of Molecule Design and Preparation of Flame Retardant Materials Northeast Forestry University Harbin 150040 China

The solubility parameters of cellulose acrylate substituted degree 2.12(CEA) have been calculated from the measured retention data by inverse gas chromatography at various temperatures. The weight frac-tion activity coefficients of the solvents at infinite dilution(Ω1∞),the Flory-Huggins thermodynamic in-teraction parameters between CEA and solvents(χ 1∞2),the excess molar heats of mixing(△H1s),the par-tial molar heats of mixing at infinite dilution(△H1∞),the solubility parameters of solvent(δ1),and the solubility parameters of CEA(δ2),were calculated at various temperatures. The δ2 of the CEA was 17.32,18.00,18.13,18.54,19.39 at 55,60,65,70 and 75℃,respectively.

关键词：溶解参数纤维素丙烯酸盐套色版

Parallel Vision ■ Image Synthesis/Augmentation

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 782-784页

作者： wenwen zhang Wenbo Zheng Qiang Li Fei-Yue Wang the School of Computer Science Shaanxi Normal UniversityXi’an 710119China the School of Computer Science and Technology Wuhan 430070China the State Key Laboratory for Management and Control of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China

Dear Editor,Scene understanding is an essential task in computer *** ultimate objective of scene understanding is to instruct computers to understand and reason about the scenes as humans *** vision is a research fram... 详细信息

关键词： instru explanation computer

Relationship between β→α dynamic transformation and dynamic recrystallization under thermomechanical coupling in Ti-5Al-5Mo-5V-1Cr-1Fe alloy

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Journal of Materials Science & Technology 2024年第12期179卷 98-113页

作者： Yue Dong Xingang Liu Hao Xu Yini He Yujiao Ke wenwen zhang College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

The thermal simulation compression tests of near-β titanium alloy Ti-5Al-5Mo-5V-1Cr-1Fe were per-formed within the range of deformation temperatures of 710-860 ℃ and strain rates of 0.001-1 s^(-1).Based on electron backscatter diffraction(EBSD)characterization and analysis technology,the inter-action between dynamic phase transformation(DPT)of β-to-α and dynamic recrystallization(DRX)under thermal-mechanical coupling is deeply and systematically *** clarify the effects of temperatures and strain rates on the orientation relationship during dynamic precipitation of α-phase within β grain interiors possessing special *** results show that the intragranular α-phase precipitated on the subgrain boundaries near {001}β with a high degree of dynamic recovery(DRV)deviates more from Burgers Orientation Relationship(BOR)than the α-phase that precipitates near{111}βas temperature *** proportion of α-phase precipitated by strain-induced on β recrys-tallized equiaxed grains for the deviating angle from BOR(θBoR)in the range of 20°-30° increases to 40%with the increase of strain rates below 800 ℃.In addition,the α-phase is dynamically precipitated on the grain boundaries with {110}β orientation,which undergoes continuous dynamic recrystallization(CDRX),exhibiting epitaxial recrystallization,namely {110}β//{0001 }α.Furthermore,the morphology of grain boundaries α phase(αGBs)precipitated by strain-induced phase transformation(SIPT)on specific types of β grain boundaries(βGBs),as well as the crystallographic orientation relationship and variant selection effect between adjacent α-variant within β grains are *** orientation relationships between α variants in {111}β grain are related with each other by 50°-60°/and 60°-70°/***"necklace"αGBs of recrystallization exhibit mainly the rotation of 50°-70° around thezone axis,while the adjacent α-variant in the grain interiors is mainly 60° or 90°/.In summary,the

关键词： Ti-55511 alloy Dynamic transformation Dynamic recrystallization Strain-induced phase transformation Burgers orientation relationship