检索结果-内蒙古大学图书馆

Scalable, Durable, and Recyclable Metal‐Free Catalysts for Highly Efficient Conversion of CO2 to Cyclic Carbonates

Angewandte Chemie 2020年第51期132卷 23491-23498页

作者： Yao‐Yao Zhang Guan‐Wen Yang Rui Xie Li Yang Prof. Bo Li Prof. Dr. Guang‐Peng Wu MOE Laboratory of Macromolecular Synthesis and Functionalization Adsorption and Separation Materials and Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University Zhe Da Road 38 Hangzhou 310027 China College of Material Chemistry and Chemical Engineering Hangzhou Normal University Yuhangtang Road 2318 Hangzhou 311121 China

A highly active bifunctional organoboron catalyst with the advantages of scalable preparation, thermostability, and recyclability was reported for the cyclization of CO2 and epoxides. An intramolecular cooperative mechanism was substantiated by investigations into the crystal structure of the catalysts, structure–performance relationships, kinetic studies, and the key reaction intermediates.A series of highly active organoboron catalysts for the coupling of CO2 and epoxides with the advantages of scalable preparation, thermostability, and recyclability is reported. The metal‐free catalysts show high reactivity towards a wide scope of cyclic carbonates (14 examples) and can withstand a high temperature up to 150 °C. Compared with the current metal‐free catalytic systems that use mol % catalyst loading, the catalytic capacity of the catalyst described herein can be enhanced by three orders of magnitude (epoxide/cat.=200 000/1, mole ratio) in the presence of a cocatalyst. This feature greatly narrows the gap between metal‐free catalysts and state‐of‐the‐art metallic systems. An intramolecular cooperative mechanism is proposed and certified on the basis of investigations on crystal structures, structure–performance relationships, kinetic studies, and key reaction *** a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re‐organized for online delivery, but are not copy‐edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the *** note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

关键词： cycloaddition CO2 capture cooperative mechanisms cyclic carbonates metal-free catalysts

来源：评论

学校读者我要写书评

暂无评论

Circularly Polarized Luminescence Active Supramolecular Nanotubes Based on PtIIComplexes That Undergo Dynamic Morphological Transformation and Helicity Inversion

引用

Angewandte Chemie 2022年第38期134卷

作者： Seok Gyu Kang Dr. Ka Young Kim Yumi Cho Dong Yeun Jeong Prof. Ji Ha Lee Prof. Tomoki Nishimura Prof. Shim Sung Lee Prof. Sang Kyu Kwak Prof. Youngmin You Prof. Jong Hwa Jung Department of Chemistry and Research Institution of Natural Sciences Gyeongsang National University (GNU) Jinju 52828 Republic of Korea Department of Energy Enginerring School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea Division of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul 03760 Republic of Korea Chemical Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima 739-8527 Japan Department of Chemistry and Materials Faculty of Textile Science and Technology Shinshu University Nagano 386-8567 Japan

Circularly polarized luminescence (CPL) with tunable chirality is currently a challenging issue in the development of supramolecular nanomaterials. We herein report the formation of helical nanoribbons which grow into helical tubes through dynamic helicity inversion. For this, chiral Pt II complexes of terpyridine derivatives, namely S - trans - 1 and R - trans - 1 , with respective S - and R -alanine subunits and incorporating trans -double bonds in the alkyl chain were prepared. In DMSO/H 2 O (5 : 1 v / v ), S - trans - 1 initially forms a fibrous self-assembled product, which then undergoes dynamic transformation into helical tubes (left-handed or M -type) through helical ribbons (right-handed or P -type). Interestingly, both helical supramolecular architectures are capable of emitting CPL signals. The metastable helical ribbons show CPL signals ( g lum =±4.7×10 −2 ) at 570 nm. Meanwhile, the nanotubes, which are the thermodynamic products, show intense CPL signals ( g lum =±5.6×10 −2 ) at 610 nm accompanied by helicity inversion. This study provides an efficient way to develop highly dissymmetric CPL nanomaterials by regulating the morphology of metallosupramolecular architectures.

关键词： Circularly Polarized Luminescence Helicity Inversion Morphological Transformation PtII-Complex Supramolecular Nanotubes

来源：评论

学校读者我要写书评

暂无评论

Electrochemical Screening of Contact Layers for Metal Halide Perovskites

arXiv

引用

arXiv 2021年

作者： Kodur, Moses Dorfman, Zachary Kerner, Ross A. Skaggs, Justin H. Kim, Taewoo Dunfield, Sean P. Palmstrom, Axel Berry, Joseph J. Fenning, David P. Chemical Engineering Program Department of Nanoengineering University of California La Jolla San DiegoCA92093 United States National Renewable Energy Laboratory GoldenCO80401 United States Materials Science and Engineering Program University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute University of Colorado BoulderCO80309 United States Department of Physics University of Colorado BoulderCO80309 United States

Optimizing selective contact layers in photovoltaics is necessary to yield high performing stable devices. However, this has been difficult for perovskites due to their complex interfacial defects that affect carrier concentrations in the active layer as well as charge transfer and recombination at the interface. Using vacuum thermally-evaporated tin oxide as a case study, we highlight electrochemical tests that are simple yet screen device-relevant contact layer properties, making them useful for process development and quality control. Specifically, we show that cyclic voltammetry and potentiostatic chronoamperometry correlate to key performance parameters in completed devices as well as other material/interfacial properties relevant to devices such as shunt pathways and chemical composition. Having fast, reliable, scalable, and actionable probes of electronic properties is increasingly important as halide perovskite photovoltaics approach their theoretical limits and scale to large-area devices. © 2021, CC BY.

关键词： Chronoamperometry

来源：评论

学校读者我要写书评

暂无评论

ensile and structural properties of natural rubber vulcanizates with different mastication times

引用

Polimeros 2021年第1期31卷

作者： Hayeemasae, Nabil Soontaranon, Siriwat Rasidi, Mohamad Syahmie Mohamad Masa, Abdulhakim Department of Rubber Technology and Polymer Science Faculty of Science and Technology Prince of Songkla University Pattani Thailand Research Unit of Advanced Elastomeric Materials and Innovations for BCG Economy Faculty of Science and Technology Prince of Songkla University Pattani Thailand Synchrotron Light Research Institute Nakhon Ratchasima Thailand Faculty of Chemical Engineering Technology Universiti Malaysia Perlis Perlis Malaysia Perlis Malaysia Rubber Engineering and Technology Program International College Prince of Songkla University Hat Yai Songkhla Thailand

Mastication reduced the molecular weight of natural rubber (NR). This would affect the tensile properties and straininduced crystallization of the rubber vulcanizates due to the structural changes of the rubber molecules. In this study, influences of mastication time on tensile response, deformation-induced crystallization, and structural effects of crosslinked NR were investigated. The crystallization behavior and structural changes during stretching were studied by means of wide angle X-ray scattering (WAXS) and small angle X-ray scattering (SAXS). Increased mastication time significantly affected modulus at specified strain and upturn point of strain-induced crystallization of the crosslinked samples while the tensile strength was influenced slightly by mastication. During stretching, degree of crystallinity at given strain was found to decrease with increasing mastication time, while the crystallite size was reduced. Moreover, the size of crosslinked network structures induced by crosslinking also decreased slightly with increasing mastication time, as suggested by SAXS measurement. © 2021 Associacao Brasileira de Polimeros. All rights reserved.

关键词： Rubber

来源：评论

学校读者我要写书评

暂无评论

Metal Halide Regulated Photophysical Tuning of Zero‐Dimensional Organic Metal Halide Hybrids: From Efficient Phosphorescence to Ultralong Afterglow

引用

Angewandte Chemie 2020年第51期132卷 23267-23271页

作者： Dr. Liang‐Jin Xu Anna Plaviak Dr. Xinsong Lin Michael Worku Dr. Qingquan He Maya Chaaban Prof. Bumjoon J. Kim Prof. Biwu Ma Department of Chemistry and Biochemistry Florida State University Tallahassee FL 32306 USA Materials Science and Engineering Program Florida State University Tallahassee FL 32306 USA Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea

Zero‐dimensional Ph4P+ (TPP+) metal halide hybrids have been developed to exhibit distinct photophysical properties, from highly efficient phosphorescence to ultralong afterglow. The afterglow properties of Ph4P+ cations could be suspended for the hybrids containing low band gap emissive metal halide species, such as SbCl52− and MnCl42−, but enhanced for the hybrid containing wide band gap non‐emissive ZnCl42−.The photophysical tuning is reported for a series of tetraphenylphosphonium (TPP) metal halide hybrids containing distinct metal halides, TPP2MXn (MXn=SbCl5, MnCl4, ZnCl4, ZnCl2Br2, ZnBr4), from efficient phosphorescence to ultralong afterglow. The afterglow properties of TPP+ cations could be suspended for the hybrids containing low band gap emissive metal halide species, such as SbCl52− and MnCl42−, but significantly enhanced for the hybrids containing wide band gap non‐emissive ZnCl42−. Structural and photophysical studies reveal that the enhanced afterglow is attributed to stronger π–π stacking and intermolecular electronic coupling between TPP+ cations in TPP2ZnCl4 than in the pristine organic ionic compound TPPCl. Moreover, the afterglow in TPP2ZnX4 can be tuned by controlling the halide composition, with the change from Cl to Br resulting in a shorter afterglow due to the heavy atom *** a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re‐organized for online delivery, but are not copy‐edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the *** note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

关键词： afterglow heavy atom effect organic–metal halide hybrids phosphorescence zero-dimensional materials

来源：评论

学校读者我要写书评

暂无评论

Sustainable flower-like Cu-Ni metal-organic frameworks catalyst for enhanced electrochemical sensing and photocatalytic degradation of antibiotic pollutants

引用

Microchemical Journal 2025年 214卷

作者： N.S.K. Gowthaman Ameer Farithkhan E. Narayanamoorthi Ponnusamy Arul Chinnathambi Nandhini Vellaichamy Balakumar S. Selvarajan School of Engineering Monash University Bandar Sunway Selangor 47500 Malaysia Center for Advanced Energy Materials SRM TRP Engineering College Tiruchirapalli 621 105 Tamil Nadu India Center for Research Easwari Engineering College Chennai 600 089 Tamil Nadu India School of Materials Science and Engineering Pusan National University Busan 46241 Republic of Korea International PhD Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City 243303 Taiwan Institute of Biochemical and Biomedical Engineering Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei 106 Taiwan Department of Materials Engineering Ming Chi University of Technology New Taipei City 24303 Taiwan Department of Chemistry Sri Ramakrishna College of Arts & Science Coimbatore 641 006 Tamil Nadu India Department of Chemistry Theni Kammavar Sangam College of Arts & Science Theni 625 531 Tamil Nadu India

Massive usage of antibiotics harms the environment through animals’ excrement and squeezes open-wellbeing issues. Enrofloxacin (EF), an antimicrobial agent, treats bacterial diseases and infections in cattle, poultry and exotic animals and exhibits harmful side effects. The present work proposed a sensitive and rapid electrochemical scaffold based on the Cu-Ni bimetallic-organic framework (Cu-Ni-MOF) for the detection of harmful EF in real-time applications. The Cu-Ni-MOF was synthesized through solvothermal approach with the support of a multifunctional organic ligand, 4,4-biphenyldicarboxylicacid and characterized through various analytical tools. The electrochemical sensor for EF detection was constructed by drop-casting the Cu-Ni-MOF on a glassy carbon electrode and the fabricated sensor exhibited higher catalytic activity when compared to the parental counterparts by exhibiting 1.7-fold higher current for EF oxidation. Further, the fabricated sensor is highly active in the linear range response of 200 nM–2 mM with a limit of detection of 15.17 nM and sensitivity of 638.71 µA mM cm −2 under optimized environments. The higher electrocatalytic activity of the Cu-Ni-MOF electrode synergistically stems from the strong interaction between Cu 2+ of the MOF and pyridone and carboxylate moieties of the EF and facile electron transition facilitated by Ni 2+ . The practicability of the sensor was evaluated in milk, egg and river water samples and the obtained results were validated with Liquid Chromatography-Mass Spectrometric technique. Furthermore, the prepared catalyst was utilized for the photochemical decontamination of EF and the present Cu-Ni-MOF catalyst delivered excellent photocatalytic activity in the decontamination of EF under visible light at ambient temperature.

关键词： Cu-Ni-MOF Electrochemical sensor Enrofloxacin Environmental pollutants Metal-organic framework Photocatalytic degradation

来源：评论

学校读者我要写书评

暂无评论

Hierarchical assembly of iron-oxide supraparticles for enhanced photothermal antibacterial activity

引用

Colloids and Interface science Communications 2025年 67卷

作者： Hammad, Mohaned Amin, Adil Ursu, Cristian Rosca, Irina Peptanariu, Dragos Qian, Liwei Nica, Valentin Hardt, Sebastian Wiggers, Hartmut Segets, Doris Institute for Energy and Materials Processes – Particle Science and Technology (EMPI–PST) University of Duisburg-Essen Duisburg Germany Physics of Polymers and Polymeric Materials Laboratory “Petru Poni” Institute of Macromolecular Chemistry Iasi Romania Centre of Advanced Research in Bionanoconjugates and Biopolymers “Petru Poni” Institute of Macromolecular Chemistry Iasi Romania College of Bioresources Chemical and Materials Engineering Shaanxi University of Science and Technology Xi'an Shaanxi China Department of Chemical Engineering University of Salamanca Salamanca Spain HSWmaterials GmbH Kamp-Lintfort Germany Institute for Energy and Materials Processes – Reactive Fluids (EMPI–RF) University of Duisburg-Essen Duisburg Germany Center for Nanointegration Duisburg-Essen (CENIDE) University of Duisburg-Essen Duisburg Germany

Bacterial infections, particularly those caused by drug-resistant strains, pose a significant global health threat. Photothermal therapy using iron-oxide nanoparticles shows promise in antibacterial treatments, but their use is limited by toxicity and nanoparticle agglomeration. This study presents a scalable spray-drying method to synthesize iron-oxide supraparticles, designed to enhance antibacterial efficacy while minimizing cytotoxicity. The iron-oxide supraparticles exhibited superior peroxidase-like activity compared to their nanoparticles, generating hydroxyl radicals through increased active sites. They demonstrated significant antibacterial activity against Escherichia coli and Staphylococcus aureus under near-infrared laser irradiation (1064 nm), achieving antibacterial rates of 77 % and 80 %, respectively, outperforming nanoparticles (25 % and 12 %). Their unique structure, with a larger diameter, rough surface, and internal porosity, contributed to improved antibacterial performance. Additionally, iron-oxide supraparticles maintained high cell viability in human dermal fibroblasts, confirming their biocompatibility. These supraparticles offer a promising approach for broad-spectrum antimicrobial applications without compromising host-cell viability. © 2025 The Authors

关键词： Antibacterial activity Photothermal therapy Spray drying Superparamagnetic iron oxide Supraparticles

来源：评论

学校读者我要写书评

暂无评论

Design of Air Quality Monitoring System Based on Web Using Wireless Sensor Network 3

Design of Air Quality Monitoring System Based on Web Using W...

引用

3rd International Conference on chemical and Material engineering, ICCME 2018

作者： Purwanto, P. Suryono, S. Sunarno, S. Doctorate Program of Environmental Science School of Postgraduates Studies Universitas Diponegoro Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Department of Physics Faculty of Science and Mathematics Universitas Diponegoro Semarang Indonesia

Air pollution (O3, SO2, CO, NOx, PM, and Pb) can have a severe impact on environmental damage and human health problems. Therefore, monitoring of pollutant levels in the air is essential to find out how much that gas levels can cause air pollution. In general, air quality monitoring is carried out using a conventional system. Inside the system requires large-sized equipment, long time for analysis, expensive, and with limited space resolution. It becomes inefficient, amid the development of technology that can carry out online monitoring, real-time, low cost, small size and a wide range of distance. The technology is known as the wireless sensor network system. The aim of this research is to design an air quality monitoring system using a Wireless Sensor Network (WSN) that can be accessed via the web and smartphone. The developing of WSN systems consist of two steps, are design and implementation device. The first step is done by assembling sensor nodes and hosting a web server. And after the device was finished, the next step is testing and calibrating of the system. The results of experiment show that the system is able to detect various air pollution, such as SO2, NOX, CO, and other environmental factors such as temperature, humidity and wind speed. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Air quality

来源：评论

学校读者我要写书评

暂无评论

Elimination of antibiotic resistance genes and control of horizontal transfer risk by UV-based treatment of drinking water: A mini review

引用

Frontiers of Environmental science & engineering 2019年第3期13卷 3-11页

作者： Virender K.Sharma Xin Yu Thomas J.McDonald Chetan Jinadatha Dionysios D.Dionysiou Mingbao Feng Department of Environmental and Occupational Health School of Public Health Texas A&M University College Station TX 77843 USA Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China Central Texas Veterans Health Care System Temple TX 76504 USA College of Medicine Texas A&M Health Science Center Bryan TX 77807 USA Environmental Engineering and Science Program Department of Chemical and Environmental Engineering (DChEE) 705 Engineering Research Center University of Cincinnati Cincinnati OH 45221 USA

Antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) have been recognized as one of the biggest public health issues of the 21 st century. Both ARB and ARGs have been determined in water after treatment with conventional disinfectants. Ultraviolet (UV) technology has been seen growth in application to disinfect the water. However, UV method alone is not adequate to degrade ARGs in water. Researchers are investigating the combination of UV with other oxidants (chlorine, hydrogen peroxide (H2O2), peroxymonosulfate (PMS), and photocatalysts) to harness the high reactivity of produced reactive species (C1-, C1O -, Cl2-,-OH, and SO4-_) in such processes with constituents of cell (e.g., deoxyribonucleic acid (DNA) and its components) in order to increase the degradation efficiency of ARGs. This paper briefly reviews the current status of different UV-based treatments (UV/chlorination, UV/H2O2, UV/PMS, and UV-photocatalysis) to degrade ARGs and to control horizontal gene transfer (HGT) in water. The review also provides discussion on the mechanism of degradation of ARGs and application of q-PCR and gel electrophoresis to obtain insights of the fate of ARGs during UV-based treatment processes.

关键词： Antibiotic resistance bacteria Advanced oxidation processes Disinfection Reactive chlorine species Sulfate radicals Reactive oxygen species

来源：评论

学校读者我要写书评

暂无评论

Prediction of carbon nanostructure mechanical properties and role of defects using machine learning

arXiv

引用

arXiv 2021年

作者： Zhao, Qi Winetrout, Jordan J. Xu, Yanxun Wang, Yusu Heinz, Hendrik Halıcıoglu Data Science Institute University of California San Diego San diegoCA92093 United States Department of Chemical and Biological Engineering University of Colorado Boulder BoulderCO80309 United States Materials Science and Engineering Program University of Colorado Boulder BoulderCO80309 United States Department of Applied Mathematics and Statistics Johns Hopkins University BaltimoreMD21218 United States

Carbon fiber and graphene-based nanostructures such as carbon nanotubes (CNTs) and defective structures have extraordinary potential as strong and lightweight materials. A longstanding bottleneck has been lack of understanding and implementation of atomic-scale engineering to harness the theoretical limits of modulus and tensile strength, of which only a fraction is routinely reached today. Here we demonstrate accurate and fast predictions of mechanical properties for CNTs and arbitrary 3D graphitic assemblies based on a training set of over 1000 stress-strain curves from cutting-edge reactive MD simulation and machine learning (ML). Several ML methods are compared and show that our newly proposed hierarchically structured graph neural networks with spatial information (HS-GNNs) achieve predictions in modulus and strength for any 3D nanostructure with only 5-10% error across a wide range of possible values. The reliability is sufficient for practical applications and a great improvement over off-the shelf ML methods with up to 50% deviation, as well as over earlier models for specific chemistry with 20% deviation. The algorithms allow more than 100 times faster mechanical property predictions than traditional molecular dynamics simulations, the identification of the role of defects and random 3D morphology, and high-throughput screening of 3D structures for enhanced mechanical properties. The algorithms can be scaled to morphologies up to 100 nm in size, expanded for chemically similar compounds, and trained to predict a broader range of properties. © 2021, CC BY.

关键词： Defects

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：