检索结果-内蒙古大学图书馆

arXiv 2019年

作者： Fronzi, Marco N. Assadi, M. Hussein Hanaor, Dorian A.H. International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’anShaanxi710049 China 1-1 Namiki TsukubaIbaraki305-0044 Japan Chair of Advanced Ceramic Materials Institute for Materials Science and Technology Technische Universität Berlin Berlin10653 Germany

The hydrophobicity of CeO2 surfaces is examined here. Since wettability measurements are extremely sensitive to experimental conditions, we propose a general approach to obtain contact angles between water and ceria surfaces of specified orientations based on density functional calculations. In particular, we analysed the low index surfaces of this oxide to establish their interactions with water. According to our calculations, the CeO2 (111) surface was the most hydrophobic with a contact angle of Θ = 112.53° followed by (100) with Θ = 93.91°. The CeO2 (110) surface was, on the other hand, mildly hydrophilic with Θ = 64.09°. By combining our calculations with an atomistic thermodynamic approach, we found that the O terminated (100) surface was unstable unless fully covered by molecularly adsorbed water. We also identified a strong attractive interaction between the hydrogen atoms in water molecules and surface oxygen, which gives rise to the hydrophilic behaviour of (110) surfaces. Interestingly, the adsorption of water molecules on the lower-energy (111) surface stabilises oxygen vacancies, which are expected to enhance the catalytic activity of this plane. The findings here shed light on the origin of the intrinsic wettability of rare earth oxides in general and CeO2 surfaces in particular and also explain why CeO2 (100) surface properties are so critically dependant on applied synthesis methods. Copyright © 2019, The Authors. All rights reserved.

关键词： Density functional theory

来源：评论

学校读者我要写书评

暂无评论

Glycerol carbonate synthesis from glycerol and dimethyl carbonate using guanidine ionic liquids

引用

Chinese Journal of Chemical engineering 2017年第9期25卷 1182-1186页

作者： Xingxing Wang Peng Zhang Penglei Cui Weiguo Cheng Suojiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

A large number of surplus glycerol from the biodiesel production can be used as renewable feedstock to produce glycerol carbonate. In this paper, a series of guanidine-based ionic liquids were synthesized to catalyze the transesterification of glycerol and dimethyl carbonate. The tunable basicity and the anion–cation cooperative effect were responsible for the obtained results. The [TMG][TFE] showed the best activity turnover frequency(TOF)of 1754.0 h^(-1), glycerol(GL) conversion of 91.8%, glycerol carbonate(GC) selectivity of 95.5%) at 80 °C with 0.1 mol% catalyst for 30 min. The reaction mechanism of the transesterification was also proposed.

关键词： Guanidine-based ionic liquids Glycerol carbonate Transesterification

来源：评论

学校读者我要写书评

暂无评论

Numerical and experimental studies on the influences of flow field on the measurement accuracy of ultrasonic water meters

引用

Measurement: Sensors 2021年 18卷

作者： Jieqiang Ji Jianying Zheng GuoFu Chen Xiaojie Wu NingNing Zhang Yan Fang Leming Cheng Zhejiang Province Institute of Metrology Hangzhou 310018 China National Centre of Quality Supervision and Testing on Liquid Flow Measuring Instruments Hangzhou 310018 China State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

CFD modelling and experiments are carried out to study the influences of flow field on the measurement accuracy of ultrasonic water meters. The swirl generator and flow disturber are selected to change the flow field distributions inside the pipe. The calculation results show that the installation of left-handed swirl generator induces a specific flow pattern of the fluid inside the pipe, while the installation of flow disturber leads to the distortion of the axial velocity distributions. The critical distance of the fluid reaching the steady flow is 10D for left-handed swirl generator and flow disturber. In the experiment part, six different ultrasonic water meters are selected for the intrinsic errors tests. The results show that the installations of swirl generator and flow disturber induce the intrinsic errors shift to negative values. Compared with the flow disturber, the swirl generator has greater impact on the measurement accuracy.

关键词： flow field Disturbance generators Ultrasonic water meters CFD

来源：评论

学校读者我要写书评

暂无评论

Correction to: Research on Performance and Safety of Composite Inorganic Phase-Change Materials (NaNO3/SiO2/C) under Low-temperature Cold Shock

引用

Journal of Materials engineering and Performance 2021年第11期30卷 8686-8686页

作者： Liu, Liang Wu, Aixiang Huang, Yun Li, Junqin Beijing Academy of Safety Science and Technology Beijing China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing China Anhui Emergency Management Publicity and Education Center Hefei China Gansu Vocational and Technical College of Communications Lanzhou China

来源：评论

学校读者我要写书评

暂无评论

Cover Image, Volume 95, Issue 6

引用

Journal of Chemical Technology & Biotechnology 2020年第6期95卷

作者： Lei Yuan Xiangping Zhang Baozeng Ren Yingliang Yang Yinge Bai Lu Bai Hongshuai Gao Shaojuan Zeng College of Chemical and Engineering Zhengzhou University Zhengzhou China Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing China College of Chemical and Engineering University of Chinese Academy of Sciences Beijing China

The cover image is based on the Original Article Dual-Functionalized Protic Ionic Liquids for Efficient Absorption of NH3 through Synergistically Physicochemical Interaction by Shaojuan Zeng, Yingliang Yang, Lei Yuan ...

关键词：

来源：评论

学校读者我要写书评

暂无评论

Unveiling Electrochemical Urea Synthesis by Co-Activation of CO2and N2with Mott–Schottky Heterostructure Catalysts

引用

Angewandte Chemie 2021年第19期133卷

作者： Menglei Yuan Junwu Chen Yiling Bai Prof. Zhanjun Liu Jingxian Zhang Tongkun Zhao Qin Wang Shuwei Li Prof. Hongyan He Prof. Guangjin Zhang CAS Key Laboratory of Green Process Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China Center of Materials Science and Optoeletronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 P. R. China Engineering Design Department Hebei Enco Petrochemical Engineering Co. Ltd. Henan Branch Henan 450000 P. R. China Chemistry and Chemical Engineering Guangdong Laboratory Shantou 515031 P. R. China

Electrocatalytic C−N bond coupling to convert CO 2 and N 2 molecules into urea under ambient conditions is a promising alternative to harsh industrial processes. However, the adsorption and activation of inert gas molecules and then the driving of the C–N coupling reaction is energetically challenging. Herein, novel Mott–Schottky Bi-BiVO 4 heterostructures are described that realize a remarkable urea yield rate of 5.91 mmol h −1 g −1 and a Faradaic efficiency of 12.55 % at −0.4 V vs. RHE. Comprehensive analysis confirms the emerging space–charge region in the heterostructure interface not only facilitates the targeted adsorption and activation of CO 2 and N 2 molecules on the generated local nucleophilic and electrophilic regions, but also effectively suppresses CO poisoning and the formation of endothermic *NNH intermediates. This guarantees the desired exothermic coupling of *N=N* intermediates and generated CO to form the urea precursor, *NCON*.

关键词： C–N coupling electrocatalysis Mott–Schottky heterostructures urea

来源：评论

学校读者我要写书评

暂无评论

Front Cover: Reentrant 2D Nanostructured Liquid Crystals by Competition between Molecular Packing and Conformation: Potential Design for Multistep Switching of Ionic Conductivity (ChemPhysChem 8/2023)

引用

ChemPhysChem 2023年第8期24卷

作者： Kazuma Hamaguchi Dr. Huanjun Lu Shota Okamura Dr. Satoshi Kajiyama Dr. Junya Uchida Shunsuke Sato Dr. Go Watanabe Dr. Yoshiki Ishii Prof. Dr. Hitoshi Washizu Prof. Dr. Goran Ungar Prof. Dr. Takashi Kato Department of Chemistry and Biotechnology School of Engineering The University of Tokyo Hongo Bunkyo-ku Tokyo 113-8656 Japan 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 Suzhou 215009 China Department of Physics School of Science Kitasato University Kitasato Minami-ku Sagamihara Kanagawa 252-0373 Japan Graduate School of Information Science University of Hyogo Minatojima-Minamimachi Chuo-ku Kobe Hyogo 650-0047 Japan State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft Matter Xi'an Jiaotong University Xi'an 710049 China Research Initiative for Supra-Materials Shinshu University Wakasato Nagano 380-8553 Japan

来源：评论

学校读者我要写书评

暂无评论

Cover Picture: Phosphoric Acid: A key Role in Control of Structure and Properties of Vanadium Phosphorus Oxide Catalysts During Synthesis (04/2021)

引用

ChemistrySelect 2021年第4期6卷

作者： Ting Zhang Dr. Ruirui Zhang Yongkang Zhang Zhiqi Xie Yingwei Li Hui Wu Dr. Fei Dai Prof. Ruixia Liu Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering CAS 1North 2nd Street Zhongguancun Haidian District Beijing 100190 CN Sino-Danish College University of Chinese Academy of Sciences Yuquan Road Shijingshan District Beijing 100049 CN The authors T. Zhang and R. Zhang contributed equally to this article. School of Chemical Engineering University of Chinese Academy of Sciences Yuquan Road Shijingshan District Beijing 100049 CN

来源：评论

学校读者我要写书评

暂无评论

Effect of particle content on relative permeabilities in water flooding

引用

Journal of Petroleum Science and engineering 2021年 205卷

作者： Xiaocong Yu Yushu Wang Yongfei Yang Ke Wang Jun Yao Kai Zhang Hai Sun Lei Zhang Wenhui Song Vadim Lisitsa School of Petroleum Engineering Faculty of Earth Resources China University of Geosciences Wuhan 430074 PR China Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)) Ministry of Education Qingdao 266580 PR China Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 PR China Institute of Mathematics SB RAS Novosibirsk 630090 Russia

Water flooding is the most widely used method to enhance oil recovery. Simulating the influence of particle content on fluid flow in water flooding process can provide instructive significance for oilfield development. In this paper, a pore network model was established to simulate the transport process of particles in injected water and fallen particles from the reservoir. It was used to study the influence of particle blockage, deposition and migration on the clogged throats and changes of oil-water relative permeability curves. In the model, four parameters were set, fallen particle diameter, injected particle diameter, fallen particle number and injected particle number. Other parameters were fixed and only a variable was changed to explore the changeable rule of relative permeability curves. It can be generally noted that fallen particle changes have great influence on the relative permeability curves of oil phase and injected particle changes mainly affect the relative permeability curves of water phase. It is of great significance for oilfield development to study the influence of particle transportation on fluid seepage processes.

关键词： Water flooding Pore network model Relative permeability curves Particle transportation

来源：评论

学校读者我要写书评

暂无评论

Switchable Electrostatically Templated Polymerization

引用

Angewandte Chemie 2022年第39期134卷

作者： Chendan Li Jose R. Magana Fabian Sobotta Junyou Wang Martien A. Cohen Stuart Bas G. P. van Ravensteijn Ilja K. Voets 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 Institute for Complex Molecular Systems Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Current address: Grup d'Enginyeria de Materials (GEMAT) Institut Químic de Sarrià (IQS) Universitat Ramon Llull (URL) 08022 Barcelona Spain Current address: Department of Pharmaceutics Utrecht Institute for Pharmaceutical Sciences (UIPS) Faculty of Science Utrecht University P.O. Box 80082 3508 TB Utrecht The Netherlands

We report a switchable, templated polymerization system where the strength of the templating effect can be modulated by solution pH and/or ionic strength. The responsiveness to these cues is incorporated through a dendritic polyamidoamine-based template of which the charge density depends on pH. The dendrimers act as a template for the polymerization of an oppositely charged monomer, namely sodium styrene sulfonate. We show that the rate of polymerization and maximum achievable monomer conversion are directly related to the charge density of the template, and hence the environmental pH. The polymerization could effectively be switched “ON” and “OFF” on demand, by cycling between acidic and alkaline reaction environments. These findings break ground for a novel concept, namely harnessing co-assembly of a template and growing polymer chains with tunable association strength to create and control coupled polymerization and self-assembly pathways of (charged) macromolecular building blocks.

关键词： Complex Core Coacervate Micelles PIESA Polyelectrolytes RAFT Polymerization Templated Polymerizations

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：