检索结果-内蒙古大学图书馆

Inside Back Cover: Nucleation and Growth of Amino Acid and Peptide Supramolecular Polymers through Liquid–Liquid Phase Separation (Angew. Chem. Int. Ed. 50/2019)

引用

Angewandte Chemie International Edition 2019年第50期58卷

作者： Dr. Chengqian Yuan Dr. Aviad Levin Dr. Wei Chen Dr. Ruirui Xing Dr. Qianli Zou Dr. Therese W. Herling Dr. Pavan Kumar Challa Prof. Tuomas P. J. Knowles Prof. Xuehai Yan State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China Department of Chemistry University of Cambridge Lensfield Road Cambridge CB2 1EW UK State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China Cavendish Laboratory University of Cambridge CB3 0FE Cambridge UK Center for Mesoscience Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China

来源：评论

学校读者我要写书评

暂无评论

Multifunctional silver film with superhydrophobic and antibacterial properties

引用

Nano Research 2016年第2期9卷 442-450页

作者： Ping Che Wei Liu Xiaoxue Chang Anhe Wang Yongsheng Han School of Chemistry and Biological Engineering University of Science & Technology Beijing Beijing 100083 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190China State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Science Beijing 100190 China Key Laboratory of Colloid and Interface Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

Material properties are strongly dependent on material structure. The large diversity and complexity of material structures provide significant opportunities to improve the properties of the materials, expanding their applications. Here, we discuss the fabrication of a multifunctional silver film prepared by controlling the nucleation and growth of silver particles. Silver films with high hydrophobicity and antibacterial activity were fabricated by adopting an electrochemical approach. The dependence of the hydrophobic and antibacterial properties on the size and shape of the silver particles was first investigated. Small-sized silver particles exhibited a high antibacterial rate, while a porous silver film composed of dendritic particles showed a significant hydrophobic activity. By regulating the reaction time, current density, and silver salt concentration, a silver film with a contact angle of 150.9° and an antibacterial rate of 54.7% was synthesized. This study demonstrates that finding a compromise between different material structures is a suitable wav to fabricate multifunctional devices.

关键词： hydrophobicity antibacterial silver film electrodeposition

来源：评论

学校读者我要写书评

暂无评论

Transition metal-doped heteropoly catalysts for the selective oxidation of methacrolein to methacrylic acid

引用

Frontiers of Chemical Science and engineering 2016年第1期10卷 139-146页

作者： Yanxia Zheng Heng Zhang Lei Wang Suojiang Zhang Shaojun Wang School of Light Industry and Chemical Engineering Dalian Polytechnic University Dalian 116034 China Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemistry and Chemical Engineering Qufu Normal University Qufu 273165 China

Heteropoly compounds with the general formula Cs1Mo.5X＋H3-o.5xP1.2MOllVO4o （M = Fe, Co, Ni, Cu or Zn） and CslCuyH3_2yP1.2MO11VO40 （y = 0.1, 0.3 or 0.7） were synthesized and then used as catalysts for the selective oxidation of methacrolein to methacrylic acid. The effects of the transition metals on the structure and activity of the catalysts were investigated. FTIR spectra showed that the transition metal-doped catalysts main- tained the Keggin structure of the undoped catalysts. X-ray diffraction results indicated that before calcination, the catalysts doped with Fe and Cu had cubic secondary structures, while the catalysts doped with Co, Ni or Zn had both triclinic and cubic phases and the Co-doped catalyst had the highest content of the triclinic form. Thermal treatment can decrease the content of the triclinic phase. NH3 temperature-programmed desorption and H2 tem- perature-programmed reduction results showed that the transition metals changed the acid and redox properties of the catalysts. The addition of Fe or Cu had positive effects on the activities of the catalyst which is due to the improvement of the electron transfer between the Fe or Cu and the Mo. The effects of the copper content on structure and catalytic activity were also investigated. The CSlCUo.3H2P1.2MO11VO40 catalyst had the best performance for the selective oxidation of methacrolein to methacrylic acid.

关键词： heteropoly compounds transition metals selective oxidation methacrolein

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to “Mesoscale modeling of emulsification in rotor–stator devices: Part II: A model framework integrating emulsifier adsorption” [Chem. Eng. Sci. 193 (2019) 156–170]

引用

Chemical engineering Science 2019年 197卷 326-326页

作者： Chao Chen Xiaoping Guan Ying Ren Ning Yang Jinghai Li Christian Kunkelmann Eduard Schreiner Christian Holtze Kerstin Mülheims Bernd Sachweh State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences P.O. Box 353 Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China BASF SE 67056 Ludwigshafen am Rhein Germany BASF Advanced Chemicals Co. Ltd. 200137 Shanghai China

来源：评论

学校读者我要写书评

暂无评论

Formation damage evaluation of a sandstone reservoir via pore-scale X-ray computed tomography analysis

引用

Journal of Petroleum Science and engineering 2019年 183卷

作者： Yongfei Yang Yingwen Li Jun Yao Kai Zhang Stefan Iglauer Linda Luquot Zengbao Wang 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 Petroleum Engineering Department Edith Cowan University Joondalup Western Australia 6027 Australia Hydrosciences Montpellier - CNRS Hydrosciences Montpellier Montpellier France School of Energy Resources China University of Geosciences (Beijing) Beijing 100083 PR China

The incompatibility between workover fluid and reservoir rock is one of the causes of formation damage. Fines migration and clay swelling are considered as the major mechanisms responsible for formation damage, which results in declining productivity. However, there has been limited visualized evidence of pore structural changes during formation damage. This paper establishes a formation damage evaluation method for sandstone reservoirs based on X-ray micro-computed tomography (CT) analysis. We presented conclusive evidence for clay swelling and fines migration during workover fluid flooding and formation liquid flooding. Water sensitivity and flow rate sensitivity tests were performed on a Dongying sandstone (heterogeneous argillaceous sandstone) plug. In addition, the plug was micro-CT imaged before and after flooding with workover fluid and formation liquid at medium resolution (24 μm voxel size); the changes in core permeability and the associated changes in 2D and 3D pore space were analyzed. We found that the sandstone pore space was partially blocked by clay minerals and moving particles, leading to significantly decreased porosity (5.17%–4.19% for sample 1, 5.38%–2.76% for sample 2) and permeability (3.38 × 10 −3  μm 2 to 1.28 × 10 −3  μm 2 for sample 1, 13.30 × 10 −3  μm 2 to 3.15 × 10 −3  μm 2 for sample 2). This permeability decrease was caused by a decrease in the average pore radius and coordination number. Moreover, increased micro-CT intensity was measured by comparison of initial and final tomogram images, representing clay swelling & blockage of pores during the displacement and a generally lower porosity. This work visualized microscale formation damage, which reminds that incompatibility between workover fluid and reservoir rock damages formation seriously and the fluid injection rate should be lower than the critical flow rate when developing a reservoir with a strong water sensitivity and flow rate sensitivity.

关键词： X-ray computed tomography In-situ imaging Permeability change Fines migration Clay swelling Formation damage

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation of stirred tanks using a hybrid immersed-boundary method

引用

Chinese Journal of Chemical engineering 2016年第9期24卷 1122-1134页

作者： Shengbin Di Ji Xu Qi Chang Wei Ge State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Conventionally, multiple reference frame(MRF) method and sliding mesh(SM) method are used in the simulation of stirred tanks, however, both methods have limitations. In this study, a hybrid immersed-boundary(IB)technique is developed in a finite difference context for the numerical simulation of stirred tanks. IBs based on Lagrangian markers and solid volume fractions are used for moving and stationary boundaries, respectively, to achieve optimal efficiency and accuracy. To cope with the high computational cost in the simulation of stirred tanks, the technique is implemented on computers with hybrid architecture where central processing units(CPUs) and graphics processing units(GPUs) are used together. The accuracy and efficiency of the present technique are first demonstrated in a relatively simple case, and then the technique is applied to the simulation of turbulent flow in a Rushton stirred tank with large eddy simulation(LES). Finally the proposed methodology is coupled with discrete element method(DEM) to accomplish particle-resolved simulation of solid suspensions in small stirred tanks. It demonstrates that the proposed methodology is a promising tool in simulating turbulent flow in stirred tanks with complex geometries.

关键词： Immersed-boundary method CPU–GPU hybrid computing Stirred tank Large eddy simulation

来源：评论

学校读者我要写书评

暂无评论

Recent advances in nanoporous graphene membrane for gas separation and water purification

引用

Science Bulletin 2015年第21期60卷 1807-1823页

作者： Chengzhen Sun Boyao Wen Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

Graphene is a one-atom-thick sheet of graphite comprising sp2-hybridized carbon atoms arranged in the hexagonal honeycomb lattices. By removing the honeycomb lattices and forming nanopores with specific geometry and size, nanoporous graphene has been demonstrated as a very high-efficiency separation membrane, due to the ultrafast molecular permeation rate for its one-atom thickness. This review focuses on the recent advances in nanoporous graphene membrane for the applications of gas separation and water purification, with a major emphasis on the molecular permeation mechanisms and the advanced fabrication methods of this state-of-the-art membrane. We highlight the advanced theoretical and experimental works and discuss the gas/water molecular transport mechanisms through the graphene nanopores accompanied with theoretical models. In addition, we summarize some representative membrane fabrication methods, covering the graphene transfer to porous substrates and the pore generation. We anticipate that this review can provide a platform for understanding the current challenges to make the conceptual membrane a reality and attracting more and more attentions from scientists and engineers.

关键词： Nanoporous graphene Gas separationWater purification Molecular permeationmechanism Membrane fabrication

来源：评论

学校读者我要写书评

暂无评论

Aqueous Synthesis of Ultrathin Platinum/Non‐Noble Metal Alloy Nanowires for Enhanced Hydrogen Evolution Activity

引用

Angewandte Chemie 2018年第36期130卷

作者： Zhaojun Liu Jing Qi Moxuan Liu Shumeng Zhang Qikui Fan Hongpo Liu Kai Liu Haoquan Zheng Yadong Yin Chuanbo Gao Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710054 China School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an Shaanxi 710119 China Department of Chemistry University of California Riverside CA 92521 USA

Although aqueous synthesis of nanocrystals is advantageous in terms of the cost, convenience, environmental friendliness, and surface cleanness of the product, nanocrystals of Pt and non‐noble metal alloys are difficult to obtain with controlled morphology and composition from this synthesis owing to a huge gap between the reduction potentials of respective metal salts. This huge gap could now be remedied by introducing a sulfite into the aqueous synthesis, which is believed to resemble an electroless plating mechanism, giving rise to a colloid of Pt‐M (M=Ni, Co, Fe) alloy nanowires with an ultrasmall thickness (ca. 2.6 nm) in a high yield. The sulfite also leads to the formation of surface M−S bonds and thus atomic‐level Pt/M–S(OH) interfaces for greatly boosted hydrogen evolution kinetics under alkaline conditions. An activity of 75.3 mA cm −2 has been achieved with 3 μg of Pt in 1 m KOH at an overpotential of 70 mV, which is superior to previously reported catalysts.

关键词： Dimetall-Legierungen Nanodrähte Platin Wasserstoffentwicklung Wässrige Synthesen

来源：评论

学校读者我要写书评

暂无评论

Influence of wettability on motion of compound droplets on solid surface in microchannel flow

Influence of wettability on motion of compound droplets on s...

引用

2016年大连国际微流控和芯片实验室大会

作者： Xinglong Shang Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

To understand droplet motion on solid surfaces is very important for many applications such as enhanced oil recovery（Freitas et al.2011）,droplet spreading,manipulation and fabrication of droplets in microfluidic devices（Worner et al.2012）.Solid surface wettability affects significantly the movement of the contact line and hence dominants the motion of droplets on solid surfaces,especially when the flow is confined to ***,the compound droplets are often common with the applications mentioned above（e.g.,water-in-oil-in-water and oil-in-water-in-oil type compound droplet）.Furthermore,the wettability of solid surfaces is often heterogeneous that make the drop motion more *** aim of this work is to investigate the influence of solid surface wettability（e.g.,solid surface wettability gradient and contact angle hysteresis） on the motion of compound droplets in microchannel *** this end,we develop a three-dimensional model by combining the front tracking method for drop surface motion and the generalized Navier boundary condition（Qian et al.2003） for contact line *** front tracking method to model the deformation and motion of compound droplets surrounded by elastic interfaces has been developed and validated in our previous work（Bai et al.2012;Luo et al.2015）.The presence of inner droplet significantly influences the deformation and motion of compound droplets on solid *** to the results from previous two-dimensional front tracking methods（Huang et al.2004） and other numerical methods（Ding et al.2010）,the pattern of ripples is observed in our simulations on the drop *** effects of dimensionless numbers including the Reynolds number,the capillary number and the volume ratio of the inner to the outer droplet are ***,it is demonstrated that the gradient of solid surface wettability and the hysteresis of contact angle have a remarkable effect on the deformation and motion of compound droplets.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Movement of Oil-Water-Solid Three-Phase Contact Line under Velocity Gradients

Movement of Oil-Water-Solid Three-Phase Contact Line under V...

引用

2016年大连国际微流控和芯片实验室大会

作者： Wenxiu ZHENG Chengzhen SUN Bofeng BAI State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

The movement of three-phase contact line which formed in the oil-water-solid three-phase area is of great importance in a number of applications,such as oil recovery,groundwater remediation,decontamination and *** process of oil droplets/film migration and detachment,which are controlled by the moving contact line,has shown its great significance in oil *** are various factors which can drive the contact line to move,such as pressure and electrical driving forces,etc,which will generate a velocity gradient for the flow near the *** this paper,we dedicate to investigate the moving rule of contact line under a velocity gradient from molecular dynamics(MD) ***,MD simulations are implemented by the FORCITE module in the Material Studio software to obtain the microscopic view of the moving contact *** size of the system is about 14 nm×3 nm×50 nm,including 2880 oil molecules and 33080 water *** interatomic interactions are described by COMPASS force field,for which van der Waals interaction is described by 9-6 Lennard-Jones potential and electronic interaction is described by Coulombic potential *** water and oil molecules are arranged on a silica substrate and the velocity gradient is generated by moving the upper *** water molecules we used SPC/E *** cutoff radius is 1.25 nm to the short-range intermolecular *** long-range Coulombic interactions are handled with the Ewald *** on the MD simulations,the configuration of water and oil molecules shows us the morphology of the contact line and variations of the contact angle at different velocity *** results exhibit that the contact line will move only when the velocity gradient is larger than a certain *** force inside the contact line region such as friction force and shear stress are calculated to make a deep understanding of the moving contact *** property of water/oil molecules and velocity profile

关键词： Movement of Oil-Water-Solid Three-Phase Contact Line under Velocity Gradients Velocity

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：