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Ag-decorated 3D flower-like Bi_(2)MoO_(6)/rGO with boosted photocatalytic performance for removal of organic pollutants

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Rare Metals 2021年第5期40卷 1086-1098页

作者： Xin Liu Wei-Ya Huang Qin Zhou Xi-Rong Chen Kai Yang Dan Li Dionysios D.Dionysiou Faculty of Materials Metallurgical and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China Environmental Engineering and Science Program Department of Chemical and Environmental EngineeringUniversity of CincinnatiCincinnatiOH 45221-0012USA College of Science HealthEngineering and EducationMurdoch UniversityMurdoch 6150Australia

A series of unique 3D flower-like Bi_(2)MoO_(6)(BMO)/reduced graphene oxide(rGO)heterostructured composites decorated with varying amounts of Ag nanoparticles(NPs)were *** morphological characteristics,structural features,energy band structures and photoelectrochemical properties were systematically *** the Ag/BMO/rGO ternary composites(AgBGy;y=1%,2%and 3%)demonstrated greater photocatalytic activity towards efficient removal of our selected organic models[methyl orange(MO),rhodamine B(RhB)and phenol],as compared with the BMO/rGO binary composites(BG-x;x=0.25,2,4 and 5).Particularly,AgBG-2%,which was synthesized with the addition of 2 wt% rGO and 2 wt%Ag in BMO,possessed superior photocatalytic *** fitted rate constants(k)for the photocatalytic degradation of RhB,MO and phenol using AgBG-2% were estimated to be 0.0286,0.0301 and 0.0165 min^(-1),respectively,which were over one order of magnitude greater than those obtained using pure *** factors may contribute to the observed enhancement,including greater specific surface area,enhanced light absorption,promoted spatial separation of electronhole(e^(-)-h^(+))pairs and their suppressed recombination,especially benefiting from the synergistic effects among BMO,rGO and Ag *** work suggests that the rational design of BMO/rGO/Ag ternary composite was an effective strategy to boost the photocatalytic activity of the resulting catalyst towards the highly efficient removal of organic pollutants from water.

关键词： Bi_(2)MoO_(6) Reduced graphene oxide Ag nanoparticles 3D flower-like morphology Photocatalytic degradation

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Converting poly(ethylene terephthalate) waste into N-doped porous carbon as CO_(2) adsorbent and solar steam generator

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Green Energy & Environment 2022年第3期7卷 411-422页

作者： Changyuan Song Boyi Zhang Liang Hao Jiakang Min Ning Liu Ran Niu Jiang Gong Tao Tang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Materials Science&Engineering National University of Singapore9 Engineering Drive 1Singapore117576Singapore State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

Sustainable conversion of waste plastics into valuable carbon materials for diverse applications provides a promising strategy to dispose the municipal and industrial waste ***,it remains a challenge to precisely control the crosslinking reaction for transforming waste polyesters into N-doped porous carbon (NPC) with well-defined ***,we put forwards a strategy of stepwise crosslinking using melamine and ZnCl_(2)/NaCl eutectic salts to convert poly (ethylene terephthalate)(PET) into NPC at 550℃.We prove that firstly melamine reacts with PET degradation products to form a crosslinking structure,and subsequently ZnCl_(2)/NaCl promote the dehydration and decarboxylation of the crosslinking structure to generate a more thermally stable crosslinking *** coordination of two tandem crosslinking reactions is critical to control the microstructure of *** activations,NPC shows large specific surface area of 1173 m~2g^(-1),abundant N dopants,and rich oxygen-containing *** combined features endure NPC with excellent performance in CO_(2) capture and solar steam generation,e.g.,high CO_(2) adsorption capacity of 6.47 mmol g^(-1) and evaporation rate of 1.62 kg m^(-2)h^(-1).More importantly,NPC is compared to or prevails over previous carbon-based CO_(2) adsorbents or photothermal *** work will advance the research on “green” reutilization of low-cost polyester wastes to prepare sustainable carbon for solar energy conversion,environmental protection,etc.

关键词： adsorbent crosslinking polyester

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Comparative Study of Commercial Glass Fiber-Reinforced Polyester Composite Beams: Thermal Behavior and Durability to QUV Exposure

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Journal of The Institution of Engineers (India): Series D 2024年第3期105卷 1331-1340页

作者： Wulandari, Retno Radini, Fitri Ayu Yunus, Muhammad Arti, Dewi Kusuma Harianingsih Rusmana, Dasep Pratama, Ade Research Center for Polymer Technology National Research and Innovation Agency Banten South Tangerang15314 Indonesia Research Center for Advanced Material National Research and Innovation Agency Banten South Tangerang15314 Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Negeri Semarang Kampus Sekaran Semarang50229 Indonesia Directorate of Laboratory Management Research Facilities and Science Areas National Research and Innovation Agency Banten South Tangerang15314 Indonesia

Glass fiber-reinforced polyester (GFRP) composite beam is massively used in infrastructure because of its versatility. It is available in various matrices and fiber types and prices, so further research is required to understand the variations in its properties. This study examined two commercially available GFRP composite beams with a large price difference, almost 5 times. The inexpensive GFRPC was denoted as GFRPC 1 and the expensive GFRPC was denoted as GFRPC 2. Both composites employed unsaturated polyester, with a content of 36.53% and 36.02%, for GFRPC 1 and GFRPC 2, respectively. The glass fiber as filler was the same type, with a content of 62.19% and 63.98% for GFRPC 1 and GFRPC 2, respectively. Notably, GFRPC 1 exhibited combustible material of 1.28% during combustion from 600 to 900 °C in the presence of oxygen. Morphologically, more voids were seen in the cross-section area of GFRPC 2 than in GFRPC 1. The kinetic study of thermal degradation revealed that GFRPC 2 displayed slightly superior thermal behavior compared to GFRPC 1, with activation energy values of 103 kJ/mol and 112 kJ/mol, respectively. The changes were observed after 400 h of QUV exposure. The color changes observed were 1.68 for GFRPC 1 and 1.58 for GFRPC 2. The yellowish color on the composite surface exposed to UV light was confirmed through FTIR analysis. A decline in the storage and loss modulus curves occurred in GFRPC 1 compared to GFRPC 2. The GFRPC 1 and GFRPC 2 loss factor curves displayed a distinct behavior. In GFRPC 1, the 400-h QUV exposure impact results in a 50% increase in the loss factor curve. After QUV exposure to GFRPC 2, two peaks appeared on the loss factor curve. These peaks might be associated with a reaction product that can be seen in IR spectra. © The Institution of Engineers (India) 2023.

关键词： Glass fibers

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A Printable and Conductive Yield-Stress Fluid as an Ultrastretchable Transparent Conductor

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Research 2021年第1期2021卷 1554-1564页

作者： Qianying Lu Yunlei Zhou Xiangfei Yin Shitai Cao Xiaoliang Wang Desheng Kong College of Engineering and Applied Sciences State Key Laboratory of Analytical Chemistry for Life Scienceand Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210046China Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education Department of Polymer Science and EngineeringSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210046China

In contrast to ionically conductive liquids and gels,a new type of yield-stress fluid featuring reversible transitions between solid and liquid states is introduced in this study as a printable,ultrastretchable,and transparent *** fluid is formulated by dispersing silica nanoparticles into the concentrated aqueous *** as-printed features show solid-state appearances to allow facile encapsulation with *** transition into liquid-like behavior upon tensile deformations is the enabler for ultrahigh stretchability up to the fracture strain of the *** integrations of yield-stress fluid electrodes in highly stretchable strain sensors and light-emitting devices illustrate the practical *** yield-stress fluid represents an attractive building block for stretchable electronic devices and systems in terms of giant deformability,high ionic conductivity,excellent optical transmittance,and compatibility with various elastomers.

关键词： attractive electrolyte reversible

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Molecular simulation-guided and physics-informed mechanistic modeling of multifunctional polymers

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Acta Mechanica Sinica 2021年第5期37卷 725-745,I0002页

作者： Guang Chen Weikang Xian Qiming Wang Ying Li Department of Mechanical Engineering University of ConnecticutStorrsCT 06269USA Sonny Astani Department of Civil and Environmental Engineering University of Southern CaliforniaLos AngelesCA 90089USA Department of Mechanical Engineering and Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsCT 06269USA

polymeric materials have a broad range of mechanical and physical *** have been widely used in material science,biomedical engineering,chemical engineering,and mechanical *** introduction of active elements into the soft matrix of polymers has enabled much more diversified functionalities of polymeric materials,such as self-healing,electroactive,magnetosensitive,pH-responsive,and many *** further enable applications of these multifunctional polymers,a mechanistic modeling method is required and of great significance,as it can provide links between materials’micro/nano-structures and their macroscopic mechanical *** this goal,molecular simulation plays an important role in understanding the deformation and evolution of polymer networks under external loads and *** molecular insights provide physical guidance in the formulation of mechanistic-based continuum models for multifunctional *** this perspective,we present a molecular simulation-guided and physics-informed modeling framework for polymeric ***,the physical theory for polymer chains and their networks is briefly *** serves as the foundation for mechanistic-models of polymers,linking their chemistry,physics,and mechanics ***,the deformation of the polymer network is used to derive the strain energy density ***,the corresponding continuum models can capture the intrinsic deformation mechanisms of polymer *** then highlight several representative examples across multiphysics coupling problems to describe in detail for this proposed *** but not least,we discuss potential challenges and opportunities in the modeling of multifunctional polymers for future research directions.

关键词： Molecular simulation Multiphysics modeling Multiscale modeling Multifunctional polymers Soft Matter

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Hierarchical Microphase Behaviors of Chiral Block Copolymers under Kinetic and Thermodynamic Control

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CCS Chemistry 2022年第7期4卷 2460-2468页

作者： Zhen Geng Huiying Wang Seon-Mi Jin Xinghao Yan Min Ren Bijin Xiong Ke Wang Renhua Deng Senbin Chen Eunji Lee Lianbin Zhang Jintao Zhu Zhenzhong Yang State Key Laboratory of Materials Processing and Die&Mould Technology Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074 School of Materials Science and Engineering Gwangju Institute of Science and Technology(GIST)Gwangju 61005 Institute of Polymer Science and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084

Chiral superstructures in confined spaces are subtly affected by the complex interplay among various noncovalent interactions,details of which are still in adequately ***,we report the threedimensional confined assembly of the chiral block copolymers of polystyrene-block-poly(D-lactide)andits enantiomer in emulsion droplets and demonstrate unprecedented successive microphase transformations from single helices to double helices with inverted helicity,and then to twisted cylinders in the constructedcolloidal *** structural transformations of chiral microphases are kinetically dependent and can further transform into thermodynamically stable achiral cylinders with saddle-shaped topology upon solvent *** formation and subsequent structural transformations as well as thefinal degeneration of chiral architectures provide guidance to understand the chiral evolution at different length scales within spherical confined space and to fabricate biomimetic systems.

关键词： chiral block copolymers helical structures confined assembly kinetic control mesoporous chiral nanochannels

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A Low-cost, Easy-to-Fabricate, and Environmentally Friendly Composite Solid Electrolyte for Use in Lithium Metal Cells Paired with Lithium Iron Phosphate and Silicon

A Low-cost, Easy-to-Fabricate, and Environmentally Friendly ...

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Fiber Society 2022 Fall Meeting and Technical Conference: 80 Years of Excellence in Advancing Scientific Knowledge Pertaining to Fibers and Fiber Materials

作者： Orenstein, Raphael Dirican, Mahmut Cheng, Hui Chang, Liang Yan, Chaoyi Wang, Eric Zhiqi Zhang, Xiangwu Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University RaleighNC United States

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Magnetic NiFe_(2)O_(4)/Polypyrrole nanocomposites with enhanced electromagnetic wave absorption

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Journal of Materials science & Technology 2022年第13期108卷 64-72页

作者： Jiang Guo Xu Li Zhuoran Chen Jianfeng Zhu Xianmin Mai Renbo Wei Kai Sun Hu Liu Yunxia Chen Nithesh Naik Zhanhu Guo School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science&TechnologyXi’an 710021China School of Urban Planning and Architecture Southwest Minzu UniversityChengdu 610041China School of Chemical Engineering Northwest UniversityXi’an 710069China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai201306China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450001China School of Mechanical Engineering Shanghai Dianji UniversityShanghai201306China Department of Mechanical&Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipal 576104KarnatakaIndia Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN37996USA

NiFe_(2)O_(4)/polypyrrole(NiFe_(2)O_(4)/PPy)nanocomposites are prepared by a simple surface-initiated polymerization method and demonstrate negative permittivity in the low frequency *** nanocomposites also exhibit significantly enhanced electromagnetic wave(EMW)absorption property in the high frequency *** with pure PPy,the enhanced negative permittivity is observed in the NiFe_(2)O_(4)/PPy nanocomposites with a NiFe_(2)O_(4)loading of 5.0,10.0,20.0 and 40.0 wt%,indicating the formation of metal-like electrical conducting network in NiFe_(2)O_(4)/PPy ***,the negative permittivity could be tuned by changing the NiFe_(2)O_(4)*** minimum reflection loss(RL)of-40.8 dB is observed in the 40.0 wt%NiFe_(2)O_(4)/PPy composites with a thickness of only 1.9 *** effective absorption bandwidth below-10.0 and-20.0 dB reaches 6.08 and 2.08 GHz,*** enhanced EMW absorption performance benefits from the improved independence matching,EMW attenuation capacity,and synergistic effects of conduction loss,dielectric loss(interfacial and dipole polarizations)and magnetic loss(exchange and natural resonances).This research work provides a guidance for the fabrication of nanocomposites with an excellent EMW absorption.

关键词： NiFe_(2)O_(4)/PPy composites Negative permittivity EMW absorption

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Conductive Mof Coating for Suppressing the Mn Dissolution in Limn2o4 Toward Long-Life Lithium-Ion Batteries

SSRN

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SSRN 2024年

作者： Kim, Eunji Lee, Jeongmin Park, Junghyun Nam, Kwan Woo Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul03760 Korea Republic of

Spinel lithium manganese oxide (LiMn2O4, denoted LMO) is one of the promising cathode materials with non-toxicity, high operating voltage, and low cost. However, structural collapse during battery cycling — caused by Mn dissolution and the Jahn-Teller effect — is a critical disadvantage, reducing cycle retention, particularly at high temperatures. In this investigation, to solve these critical issues of LMO cathode, we introduce Cu3(HITP)2, a conductive two-dimensional (2D) MOF as a surface coating material through a simple process. Coating the conductive 2D Cu3(HITP)2 MOF increases the electrical conductivity and shows the effect of suppressing the dissolution of Mn by enriching the surface of LMO with Mn4+. By suppressing Mn dissolution, structural stability also improves, resulting in offsetting all the inherent problems of LMO. As a result, at 50 °C, CuHITP–LMO exhibits an initial capacity of 98.7 mAh g–1 at 100 mA g–1 and achieved a capacity of 74.5 mAh g–1 after 100 cycles, indicating outstanding cyclability. This research highlights the potential of conductive 2D MOF to improve the electrochemical performances of battery cathode. © 2024, The Authors. All rights reserved.

关键词： Cathodes

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Solution processable carbazole-benzophenone derivatives as bipolar hosts enabling high-efficiency stable green TADF organic LEDs

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Journal of Materials Chemistry C 2023年第4期11卷 1579-1592页

作者： Nagar, Mangey Ram Kumar, Krishan Blazevicius, Dovydas Beresneviciute, Raminta Krucaite, Gintare Tavgeniene, Daiva Hao, Chen Tun Banik, Subrata Jou, Jwo-Huei Grigalevicius, Saulius Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Polymer Chemistry and Technology Kaunas University of Technology Radvilenu Plentas 19 KaunasLT50254 Lithuania School of Basic Sciences Department of Chemical Sciences Indian Institutes of Technology Mandi Himachal Pradesh India Department of Chemistry School of Chemical and Biotechnology SASTRA Deemed University Tamil Nadu Thanjavur613401 India

Solution-processable bipolar materials acting as hosts, soluble in common organic solvents, are key materials for thermally activated delayed fluorescence (TADF) emitters. Bipolar hosts are importantly anticipated to encourage solution-processable high-efficiency TADF organic light-emitting diodes (LEDs). Herein, we have successfully designed and synthesized solution-processable bipolar carbazole-benzophenone derivatives as host materials, i.e. 4,4′-di(3-phenylcarbazol-9-yl)benzophenone (BPBCzO) and 4,4′-di[3-[4-(carbazol-9-yl)phenyl] carbazol-9-y] benzophenone (BCzBCzO). These newly synthesized hosts exhibited high-triplet energies, balanced charge-transporting properties, suitable molecular orbital energy levels, good thermal stability, and good solubility, which are required to realize green TADF based organic LEDs. Initially, we fabricated two different types of TADF organic LEDs using these hosts and commercially available guest 4CzIPN as a green dopant and compared their device characteristics. A green TADF based organic LED employing BPBCzO host displayed excellent performance with a maximum external quantum efficiency (EQEmax), current efficacy (CEmax), and power efficacy (PEmax) as high as 23.2%, 70.7 cd A−1, and 55.6 l m W−1, respectively. In particular, over 90% of EQE was reserved (EQE of 21.3%) at the practical luminance of 1000 cd m−2, which is advantageous for display technology. At last, green OLED was also fabricated with a cross-linkable hole transport material, i.e. 3,6-bis(4-vinylphenyl)-9-ethylcarbazole (VPEC) and realized PEmax of 63.6 l m W−1 with EQE of 25.3%, which could be very effective for lighting and display devices. These excellent outcomes demonstrate the big potential of the carbazole-benzophenone derivatives as host materials for next-generation solution-processable display and lighting technologies. © 2023 The Royal Society of Chemistry.

关键词： Molecular orbitals

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