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Functional Polyion Complex Vesicles Enabled by Supramolecular Reversible Coordination Polyelectrolytes

Angewandte Chemie 2019年第25期131卷

作者： Wenjuan Zhou Jiahua Wang Peng Ding Xuhong Guo Martien A. Cohen Stuart Junyou Wang State Key Laboratory of Chemical Engineering and Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 P. R. China

Reported here is a new class of PICsomes (vesicles formed by polyelectrolyte complexation) in which the anionic/neutral diblock copolymer is replaced by an anionic, reversible, supramolecular polyelectrolyte based on metal–ligand coordination. This supramolecular polyelectrolyte forms exclusively inside the wall of the assembly, and therefore self‐adjusts its length to that of the cationic block provided. Moreover, the supramolecular coordination polyelectrolytes introduce new and tunable properties and functions associated with the specific metal. As a proof‐of‐concept Mn‐based PICsomes were prepared and display high magnetic relaxivity, as well as enhanced contrast in in vitro magnetic resonance imaging tests. The simplicity of our approach, together with the new functions derived from the metal ions, demonstrates a robust strategy for the preparation of a variety of PICsomes with well‐defined and tunable structures and properties.

关键词： Elektrolyte Mizellen Polymere Selbstorganisation Vesikel

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Anthracite combustion catalyzed by Ca-Fe-Ce series catalyst

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Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology 2009年第4期37卷 421-426页

作者： Gong, Xu-Zhong Guo, Zhan-Cheng Wang, Zhi State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Acad. of Sci. Beijing 100190 China Graduate University of Chinese Acad. of Sci. Beijing 100049 China Key Laboratory of Recycling and Ecological Metallurgy University of Science and Technology Beijing Beijing 100083 China

The effect of Ca-Fe-Ce series catalyst on the characteristics of anthracite combustion was investigated by thermo-gravimetric analysis. The results showed that there may be a synergetic effect among the components in the composite catalyst and the composite catalyst exhibits better performance than the single one for the anthracite combustion. The combustion characteristics of anthracite are affected by the dispersion of catalyst, heating rate and combustion atmosphere. The catalytic effect is enhanced by increasing the catalyst dispersion. The reduction degree of ignition temperature increases with the increase of heating rate. The ignition temperature decreases significantly with the increase of O2 concentration.

关键词： Thermogravimetric analysis

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Heterostructures by Templated Synthesis of Layered Double Hydroxide to Modulate the Electronic Structure of Nickel Sites for a Highly Efficient Oxygen Evolution Reaction

SSRN

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SSRN 2023年

作者： Xu, Kexin Zhong, Haihong Song, Jie Estudillo-Wong, Luis Alberto Yang, Jun Feng, Yongjun Zhao, Xiaojuan Alonso-Vante, Nicolas State Key Laboratory of Chemical Resource Engineering Beijing Engineering Center for Hierarchical Catalysts College of Chemistry Beijing University of Chemical Technology No. 15 Beisanhuan East Road Beijing100029 China School of Chemistry and Chemical Engineering Hainan University No. 58 Renmin Road Haikou570228 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Institute of High Energy Physics Chinese Academy of Science Beijing100190 China Departamento de Biocienciase Ingeniería CIIEMAD-IPN Instituto Politécnico Nacional Ciudad de México07340 Mexico IC2MP UMR-CNRS 7285 University of Poitiers PoitiersF-86022 Cedex France

The design and development highly efficient electrocatalysts for oxygen evolution reaction (OER) are critical for renewable energy generation. Ni-based electrocatalysts are widely used in the water electrolysis process. In this work, heterostructure consisting of selenides and layered double hydroxides (LDH) named (Co, Ni)Se4@NiFe-LDH, are prepared by an LDH-based strategy, in which the electronic structure of Ni active sites is regulated by interfacial electron interaction. The (Co, Ni)Se4@NiFe-LDH shows an optimized charge distribution of Ni sites and excellent catalytic activity. The effective charge modulation results in lowering the energy barrier of OOH* intermediate formation and adequate adsorption strength of the intermediates on Ni active sites, which improves the kinetics of OER. Specifically, the (Co, Ni)Se4@NiFe-LDH only requires an overpotential of 237 mV to reach the current density of 10 mA cm-2 under alkaline conditions. The results of this work demonstrate that reasonable engineering of heterostructure is an effective strategy to improve the intrinsic property of OER electrocatalysts for water splitting. © 2023, The Authors. All rights reserved.

关键词： Electrocatalysts

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Energy Storage: In Situ Fabrication of Hierarchically Branched TiO2Nanostructures: Enhanced Performance in Photocatalytic H2Evolution and Li–Ion Batteries (Small 47/2017)

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Small 2017年第47期13卷

作者： Guorui Yang Ling Wang Shengjie Peng Jianan Wang Dongxiao Ji Wei Yan Seeram Ramakrishna Department of Environmental Science & Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Mechanical Engineering National University of Singapore Singapore 117574 Singapore Jiangsu Key Laboratory of Materials and Technology for Energy Conversion College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

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Metal-insulator phase separation in KTaO3-based two-dimensional electron gas

arXiv

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arXiv 2022年

作者： Zhang, Jinlei Zhang, Jiayong Cui, Dapeng Ye, Li Gong, Shuainan Wang, Zhichao Wu, Zhenping Ma, Chunlan Gao, Ju Zhao, Yuanyuan Jiang, Yucheng Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China Department of Physics Faculty of Science National University of Singapore Singapore117551 Singapore State Key Laboratory of Information Photonics and Optical Communications School of Science Beijing University of Posts and Telecommunications Beijing100876 China School for Optoelectronic Engineering Zaozhuang University Shandong277160 China School of Physics and Optoelectronic Engineering Nanjing University of Information Science and Technology Nanjing210044 China

Electronic phase separation (EPS) originates from an incomplete transformation between electronic phases, causing the inhomogeneous spatial distribution of electronic properties. In the system of two-dimensional electron gas (2DEG), the EPS is usually identified based on a percolative metal-to-superconductor transition. Here, we report a metal-insulator transition (MIT) in KTaO3-based 2DEG with the width of conductive channel decreasing into micrometer scale. Hysteretic resistance-temperature relations are observed due to the competition between metallic and insulating phases, which is tunable by magnetic field. Such a size-dependent MIT effect is attributed to the coexistence and separation of metallic and insulating phases. Combining density functional theory calculation, we propose a theoretical model to simulate the dynamic process of the EPS using the percolation theory, demonstrating the mechanism of size-dependent MIT. Our work suggests a clear and simple 2DEG platform to achieve the spatial coexistence of metallic and insulating phases. © 2022, CC BY.

关键词： Metal insulator transition

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Effect of Template Concentration on the Crystallinity and Catalytic Performance of SAPO-34 Molecular Sieve（摘要）

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华东理工大学学报（自然科学版） 2011年第2期37卷 243-243页

作者： WANG Qian WANG Lei LI Zeng-xi MO You-bin WU Hui LI Guang-ming ZHANG Xiang-ping ZHANG Suo-jiang Graduate University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

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Preparation and characterization of high softening point and homogeneous isotropic pitches produced from distilled ethylene tar by a novel bromination method

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Carbon 2018年 134卷 537-537页

作者： Chuan-zhang Ge Zhen-long Sun Hai-xiao Yang Dong-hui Long Wen-ming Qiao Li-cheng Ling State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Shanghai 200237 China

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Vapor condensation with low air mass fraction inside water seal branch tube under free convection

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Nuclear engineering and Design 2021年 379卷

作者： Bing Tan Xi Wang Y.W. Wu W.X. Tian S.Z. Qiu G.H. Su School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi an 710049 China School of Electric Power South China University of Technology Guangzhou 510640 China

The pressure vessel has used a newly designed water seal structure, and the sealed water is from condensation at low hydrogen concentration. To get the condensation capacity of the water seal branch tube under the pressure vessel normal operation, the experimental loop named WASETEL was constructed, which is aimed at studying the heat transfer during the process of air-steam mixture condensation inside the inclined branch tube at the condition of low air mass fraction. The inner tube is diameter 0.134 m with length 0.68 m which is connected with diameter 1.4 m, high 2.5 m pressure vessel. A canon camera was set to record the images and videos of the condensate height through glass tube in communicating vessel liquidometer. The experiment was conducted under the pressure ranged from 0.2 to 0.6 MPa, air mass concentration ranged from 0.49 to 6.42% and wall subcooling ranged from 11 to 40 K. The test showed HTC (heat transfer coefficient) would sharply deteriorate with the small air fraction, compared with pure steam condensation, about 0.49% mass fraction of the air will reduce heat transfer coefficient by 70–80%. When air concentration is relatively small, those widely used relations can not predict the condensation well, therefore, a new heat transfer empirical correlation with air mass fraction, pressure and subcooling is proposed, covered all the experimental data within the error band ±13%.

关键词： Natural condensation New empirical correlation Water seal

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Experimental Study on Microscopic Pore-Scales Crude Oil Production Characteristics and Influencing Factors During Dynamic Imbibition of Shale Reservoir with Online Nmr

SSRN

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SSRN 2024年

作者： Du, Meng Yang, Zhengming Lv, Weifeng Xiao, Qainhua Qi, Xiang Yao, Lanlan Feng, Chun University of Chinese Academy of Sciences Beijing100049 China Institute of Porous Flow & Fluid Mechanics Chinese Academy of Sciences Langfang065007 China Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China State Key Laboratory of Enhanced Oil Recovery Beijing100083 China School of Oil and Gas Engineering Chongqing University of Science & Technology Chongqing401331 China

Dynamic imbibition and displacement between the matrix and fractures in shale reservoirs can significantly enhance oil recovery (EOR) following initial depletion. However, the microscopic production characteristics and seepage mechanisms at different pore scales during the dynamic imbibition process remain incompletely understood. In this study, we established an online physical simulation experiment method that combines dynamic displacement and imbibition based on nuclear magnetic resonance (NMR), and a series of online NMR water flooding dynamic imbibition experiments were conducted. Through real-time dynamic monitoring of multiphase flow and migration behavior of crude oil in each stage of dynamic imbibition, the microscopic production characteristics and influencing factors were quantitatively studied from the recovery and residual oil saturation field distribution of different scale pores, the contribution mechanism of imbibition and displacement to EOR were investigated....,Notably, fractures can effectively increase the imbibition contact area, reduce oil-water seepage resistance, and increase the contribution of displacement to recovery by 21.65%. This study provides theoretical support for clarifying the interaction between matrix-fracture imbibition and displacement and for the efficient development of shale oil. © 2024, The Authors. All rights reserved.

关键词： Fracture

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Efficient Water Reforming of Biomass to H2via Well-Organized Redox-Neutral Cleavage of C−C, O−H and C−H Bonds

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Angewandte Chemie 2024年第4期137卷

作者： Wen-Min Zhang Prof. Yang Li State Key Laboratory of Multi-phase Flow in Power Engineering and Frontier Institute of Science and Technology Xi'an Jiaotong University Xi'an 712046 China

Hydrogen (H 2 ) is a clean and environmentally friendly energy carrier. The depletion of fossil fuels makes renewable H 2 production highly desirable. Water reforming of renewable biomass to hydrogen, with a relay of natural photosynthesis to biomass, would be an indirect pathway to realize the ideal but extremely challenging photocatalytic overall water splitting to hydrogen, with favorable thermodynamics. Since the seminal work of water reforming of biomass in 1980, great endeavors have been made. Nevertheless, hitherto, the entire kinetic pathway has been elusive, which seriously limits the reforming processes. Using a designed well-organized redox-neutral cleavage of C−C, O−H and C−H bonds enabled by photoelectrocatalysis, here, we show the efficient water reforming of biomass to hydrogen at room temperature, with a yield up to 93 %. The clear insights into the kinetic pathway with oxidation of carbon radicals to carbon cations as the indicated rate-determining step, would cast brightness for efficient and sustainable hydrogen production to accelerate the hydrogen economy.

关键词： hydrogen production biomass reforming photoelectrocatalysis iron catalysis redox-neutral chemical bonds cleavage

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