检索结果-内蒙古大学图书馆

Fluorescent Probes Based on AIEgen-Mediated Polyelectrolyte Assemblies for Manipulating Intramolecular Motion and Magnetic Relaxivity

引用

Angewandte Chemie 2023年第13期135卷

作者： Yongkang Yao Dr. Peng Ding Dr. Chenxu Yan Yining Tao Bo Peng Prof. Dr. Weimin Liu Prof. Dr. Junyou Wang Prof. Dr. Martien A. Cohen Stuart Prof. Dr. Zhiqian Guo Department Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Institute of Fine Chemicals Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Chemical Engineering and Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Shanghai 200237 China School of Physical Science and Technology Shanghai Tech University Shanghai 200237 China

Uniting photothermal therapy (PTT) with magnetic resonance imaging (MRI) holds great potential in nanotheranostics. However, the extensively utilized hydrophobicity-driven assembling strategy not only restricts the intramolecular motion-induced PTT, but also blocks the interactions between MR agents and water. Herein, we report an aggregation-induced emission luminogen (AIEgen)-mediated polyelectrolyte nanoassemblies (APN) strategy, which bestows a unique “soft” inner microenvironment with good water permeability. Femtosecond transient spectra verify that APN well activates intramolecular motion from the twisted intramolecular charge transfer process. This de novo APN strategy uniting synergistically three factors (rotational motion, local motion, and hydration number) brings out high MR relaxivity. For the first time, APN strategy has successfully modulated both intramolecular motion and magnetic relaxivity, achieving fluorescence lifetime imaging of tumor spheroids and spatio-temporal MRI-guided high-efficient PTT.

关键词： Aggregation-Induced-Emission Excited-state Intramolecular Motion Fluorescent Probe Magnetic Relaxivity Polyelectrolyte

来源：评论

学校读者我要写书评

暂无评论

Current research in hydraulic turbines against sediment erosion: International partnership and collaborations

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期627卷

作者： Biraj Singh Thapa Bhola Thapa Ole Gunnar Dahlhaug Young-Ho Lee Qian Zhongdong Turbine Testing Lab Department of Mechanical Engineering Kathmandu University Dhulikhel Nepal The Waterpower Laboratory Norwegian University of Science and Technology Trondheim Norway Flow Informatics Lab Korea Maritime & Ocean University Bushan Korea State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan China

The problem of material erosion in hydraulic machineries has been under the investigation since a century ago. However, the proper solutions to the erosion of hydro turbine due to sediment-laden flows has not been found yet. The new and future hydropower development is shifting towards Asia region, which holds the highest capacity of undeveloped hydropower potential worldwide, and is also the largest contributor of the sediment intake to the ocean through its river systems. At present the various academic and research institutions are making advancements in R&D of hydraulic turbines against sediment erosion. This article highlights some major achievements made by Kathmandu University and its consortium partner intuitions in the advancement of the turbine technology for the future market.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A porous cell method for the simulation of fluid-solid interactions

引用

水道港口 2010年第5期31卷 318-318页

作者： H. B. Gu D. M. Causon C. G. Mingham L. Qian P. Z. Lin Centre for Mathematical Modelling and Flow Analysis Department of Computing and Mathematics Manchester Metropolitan UniversityManchester M 1 5GD UK State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065 China

There are many ways of describing a solid,porous or fluid region of the computational domain when solving the Navier-Stokes equations(NSE)for flow *** these the porous cell method is one of the most flexible *** this method,a parameter is defined as a ratio of the volume open to water and air in a calculation cell to its cell *** the calculation,the same numerical procedure is applied to every cell and no explicit boundary conditions are needed at solid *** method is used to simulate flow through porous media,around solid bodies and over a moving *** results compare well with experimental data and other numerical *** our future work the porous cell method will be applied to more complex fluid-solid interaction situations.

关键词： porous cell method Navier-Stokes equations sediment permeable dam level set method

来源：评论

学校读者我要写书评

暂无评论

Scalable Synthesis of Interconnected Porous Silicon/Carbon Composites by the Rochow Reaction as High‐Performance Anodes of Lithium Ion Batteries†

引用

Angewandte Chemie 2014年第20期126卷

作者： Zailei Zhang Yanhong Wang Wenfeng Ren Qiangqiang Tan Yunfa Chen Hong Li Ziyi Zhong Fabing Su State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 (China) Institute of Physics Chinese Academy of Sciences Beijing 100190 (China) Institute of Chemical Engineering and Sciences A*star 1 Pesek Road Jurong Island Singapore 627833 (Singapore)

Despite the promising application of porous Si‐based anodes in future Li ion batteries, the large‐scale synthesis of these materials is still a great challenge. A scalable synthesis of porous Si materials is presented by the Rochow reaction, which is commonly used to produce organosilane monomers for synthesizing organosilane products in chemical industry. Commercial Si microparticles reacted with gas CH 3 Cl over various Cu‐based catalyst particles to substantially create macropores within the unreacted Si accompanying with carbon deposition to generate porous Si/C composites. Taking advantage of the interconnected porous structure and conductive carbon‐coated layer after simple post treatment, these composites as anodes exhibit high reversible capacity and long cycle life. It is expected that by integrating the organosilane synthesis process and controlling reaction conditions, the manufacture of porous Si‐based anodes on an industrial scale is highly possible.

关键词： Anodenmaterialien Heterogene Katalyse Lithiumspeicher Poröse Nanostrukturen Silicium

来源：评论

学校读者我要写书评

暂无评论

Back Cover: Hydrogels from Amorphous Calcium Carbonate and Polyacrylic Acid: Bio-Inspired Materials for “Mineral Plastics” (Angew. Chem. Int. Ed. 39/2016)

引用

Angewandte Chemie International Edition 2016年第39期55卷

作者： Dr. Shengtong Sun Li-Bo Mao Zhouyue Lei Prof. Dr. Shu-Hong Yu Prof. Dr. Helmut Cölfen Physical Chemistry University of Konstanz Universitätsstrasse 10 78457 Konstanz Germany School of Chemical Engineering State Key Laboratory of Chemical Engineering Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 P.R. China Division of Nanomaterials and Chemistry Hefei National Laboratory for Physical Sciences at Microscale Department of Chemistry University of Science and Technology of China Hefei Anhui 230026 P.R. China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Laboratory for Advanced Materials Fudan University Shanghai 200433 P.R. China

来源：评论

学校读者我要写书评

暂无评论

Permeability prediction of considering organic matter distribution based on deep learning

引用

Physics of Fluids 2023年第3期35卷

作者： Hai Sun (孙海) Liang Zhou (周亮) Dongyan Fan (樊冬艳) Lei Zhang (张磊) Yongfei Yang (杨永飞) Kai Zhang (张凯) Jun Yao (姚军) 1Key Laboratory of Unconventional Oil and Gas Development China University of Petroleum (East China) Ministry of Education Qingdao 266580 People's Republic of China 2Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 People's Republic of China

At present, researchers predict permeability through core experiments that require specific experimental conditions and methods, which are difficult and time-consuming. Conventional simulation methods for predicting permeability require considerable computational resources. Therefore, deep learning can be used as a pore-scale simulation prediction method. In this study, we established a workflow for directly predicting permeability from images. Considering that the mineral properties of the nanopore wall of shale oil have a large influence on the flow, a core dataset with organic distribution was constructed with random circles, and the slip influence of organic pores was considered. From our dataset, we found that the average permeability with organic distribution was 32.3% higher than that without organic distribution. Therefore, to simulate the microscopic flow and predict the permeability of shale oil, considering the differences in the pore flow mechanisms of different minerals is necessary. We designed a convolutional network for the dataset, adopted the structure of SE-ResNet, added the squeeze-and-excitation (SE) module to the double-layer residual module of ResNet18, and combined the characteristics of the SE block with the attention mechanism and ResNet to effectively obtain the information between channels and avoid the problem of gradient disappearance or explosion. Using SE-ResNet for directly predicting the apparent permeability from images, the accuracy of the test set reached 88.5%. The model had strong generalization ability, and the SE-ResNet could map the image of the core to the apparent permeability, which was approximately 100 times faster than the direct flow simulation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Interface engineering of Z-scheme heterojunction for photocatalytic water splitting

引用

Fundamental Research 2024年

作者： Daming Zhao Yuxiao Yang Vasileios Binas Shaohua Shen School of Advanced Energy Shenzhen Campus of Sun Yat-sen University Shenzhen 518107 China Institute of Electronic Structure and Laser (IESL) FORTH P.O. Box 1527 Vasilika Vouton GR-71110 Heraklion Greece Physical Chemistry Laboratory Chemistry Department Aristotle University of Thessaloniki 54124 Thessaloniki Greece International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Photocatalytic water splitting technology can directly convert solar energy into H 2 via a zero-carbon route, offering a sustainable solution for solar utilization and H 2 supply. Among various developed photocatalysts, Z-scheme heterojunction mimicking natural photosynthesis by combining two dissimilar semiconductors for redox reactions in series has unequivocally demonstrated its superiority in enhanced charge transfer, robust redox driving force, and wide optical absorption range. A comprehensive understanding on the fundamental principles of interface engineering between semiconductor components is the key to construct an efficient Z-scheme heterojunction. By focusing on different types of semiconductors, this article thoroughly expounds the coupling principles of components in binary mediator-free and ternary solid-mediator Z-scheme heterojunctions for photocatalytic water splitting, from the viewpoint of band structure alignment and interfacial electric field design. In addition to the well summarized research progresses in recent years, perspectives on the challenges and opportunities for developing advanced Z-scheme heterojunctions are provided.

关键词： Interface engineering Z-scheme heterojunction Water splitting Photocatalysis Solar energy conversion

来源：评论

学校读者我要写书评

暂无评论

Photo-Triggered Fluorescence Polyelectrolyte Nanoassemblies: Manipulate and Boost Singlet Oxygen in Photodynamic Therapy

引用

Angewandte Chemie 2024年第2期137卷

作者： Dr. Yongkang Yao Dr. Shangjun Chen Dr. Chenxu Yan Prof. Dr. Junyou Wang Prof. Dr. Jianjun Liu Prof. Dr. Wei-Hong Zhu Prof. Dr. Chunhai Fan Prof. Dr. Zhiqian Guo Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Shanghai Key Laboratory of Functional Materials Chemistry Feringa Nobel Prize Scientist Joint Research Center Institute of Fine Chemicals Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China Institute of Molecular Medicine Renji Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200127 China Key Laboratory of Resource Chemistry of Ministry of Education Shanghai Key Laboratory of Rare Earth Functional Materials Department of Chemistry Shanghai Normal University Shanghai 200234 China State Key Laboratory of Chemical Engineering and Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Bioreactor Engineering Shanghai Frontier Science Research Base of Optogenetic Techniques for Cell Metabolism East China University of Science and Technology Shanghai 200237 China

Photodynamic therapy (PDT) is a clinically approved therapeutic modality that has shown great potential for cancer treatment. However, there exist two major problems hindering PDT applications: the nonspecific phototoxicity requiring patients to stay in dark post-PDT, and the limited photodynamic efficiency. Herein, we report a photo-triggered porphyrin polyelectrolyte nanoassembling (photo-triggered PPN) strategy, in which porphyrin photosensitizer and photoswitchable energy accepter are assembled into polyelectrolyte micelles by a combined force of charge interaction and metal-ligand coordination. The polyelectrolyte-based PPN exhibits good biocompatibility, and bestows a unique “confining isolated” inner microenvironment for fully overcoming the π–π stacking of porphyrins with significant photodynamic efficiency (123-fold enhancement). Due to the high Förster resonance energy transfer (FRET) (91.5 %) between porphyrin and photoswitch in closed-form, we could use light as a specific trigger to modulate photoswitch between closed- and open-form, and manipulate the 1 O 2 generation in three stages: pre-PDT (quenching 1 O 2 generation), during PDT (activating 1 O 2 generation), and post-PDT (silencing 1 O 2 generation). This de novo strategy has for the first time realized remotely manipulating and boosting 1 O 2 generation in PDT, well resolving the critical and general challenges of limited photodynamic efficiency and side effects from nonspecific phototoxicity.

关键词： fluorescent probe near-infrared fluorescence photodynamic therapy polyelectrolyte

来源：评论

学校读者我要写书评

暂无评论

Excess thermodynamic properties and FTIR studies of binary of 1, 3-dichlorobenzene with alkyl acetates (C1–C5) at different temperatures

引用

Chemical Data Collections 2020年 29卷

作者： R. Raju S. Ravikumar R. Gerald Arokiaraj S. Karlapudi K. Sivakumar V. Pandiyan Department of Physics Nehru Memorial College (Autonoums) Puthanampatti 621 007Tamil Nadu India. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 P. R. China. Department of Chemistry S.V.Arts Degree & P.G.College (T.T.D'S) Tirupati 517502 A.P India

Densities ( ρ ) and speed of sound ( u ) have been reported for the binary mixtures containing 1, 3- dichlorobenzene (1, 3-DCB) with methyl acetate, ethyl acetate, propyl acetate, butyl acetate and pentyl acetate at four different temperatures ( T = 303.15, 308.15, 313.15 and 318.15 K) and at atmospheric pressure. The experimental data of densities and speeds of sound has been further utilized to calculate excess molar volume ( V m E ) and excess isentropic compressibility ( κ S E ) the excess properties have been fitted to Redlich-Kister equation. Further, V m E results have also been discussed by using Prigogine–Flory–Patterson (PFP). The experimental speeds of sound data in the present investigated mixtures were compared with various theoretical models like collision factor theory (CFT) and free length theory (FLT) to check their relative merits of pure component properties. Moreover, the experimental excess functions were correlated in terms of FTIR spectral analysis.

关键词： Binary mixtures Densities Ester Halogenated benzene Speed of sound FTIR

来源：评论

学校读者我要写书评

暂无评论

Pore-scale simulation of remaining oil distribution in 3D porous media affected by wettability and capillarity based on volume of fluid method

引用

International Journal of multiphase flow 2021年 143卷

作者： Yongfei Yang Shaobin Cai Jun Yao Junjie Zhong Kai Zhang Wenhui Song Lei Zhang Hai Sun Vadim Lisitsa 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 Petroleum Geology and Geophysics SB RAS Novosibirsk 630090 Russia

Characterizing the trapped phase in porous media is essential for many engineering applications, such as enhanced oil recovery, nuclear storage, and geological sequestration of CO 2 . This study aims to study the distribution, evolution, and influencing factors of the remaining oil in the process of water flooding at the pore scale. The single-connected pore space model was established by reconstructing the real micron CT scanned images of carbonate rocks. The VOF (volume of fluid) method using FSF (filtered surface force) formulation was adopted on OpenFOAM platform to simulate the oil-water two-phase flow process at the pore scale. Different wettability and capillary number were considered in the model. The accuracy of the model was proved by comparing with previous experimental results. The results showed that in the process of water flooding, the complex pore structure would lead to the generation of remaining oil, and the phase circulation phenomenon can be observed in the remaining oil and presents two distribution forms: co-current driven flow and lid-cavity driven flow. It also revealed that the phase recirculation increases the viscous dissipation. Further research also showed that the two forms of recirculation could be transferred by changing the wettability and that a higher capillary number was more beneficial for reducing the remaining oil saturation.

关键词： Pore-scale modeling VOF Remaining oil Phase recirculation Capillary number Wettability

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：