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SSRN 2024年

作者： Gong, Xiaolong Zhao, Jianwei Liu, Kai Wang, Huafang Fan, Zitian School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Mechanical Engineering and Automation Wuhan Textile University Wuhan430200 China

Foundry dust (FD) and foundry waste ash (FWA) are difficult-to-treat solid wastes discharged from the foundry industry, and their resource utilization has attracted increasing *** this paper, high-strength and lightweight ceramsite was fabricated solely using FD and FWA as raw materials. The chemical composition and particle characteristics of FD and FWA were evaluated by X-ray fluorescence spectrometer, laser particle size analyzer, X-ray diffraction, as well as scanning electron microscope. The effects of material ratio, sintering temperature, and sintering time on the physical performance, morphological structures, and phase constitution of the ceramsite were studied. The obtained results showed that the activated clay and coal dust within the FD serve as a binder and pore-forming agent, respectively. When the ceramsite was prepared with a material ratio of FD: FWA = 50 wt.%: 50 wt.% and sintered at 1120 °C for 20 min, it exhibited remarkable physical performance, characterized by a compressive strength as high as 8.51 MPa, a 1 h water absorption of 2.97%, and a bulk density and apparent density as low as 0.68 g/cm3 and 1.23 g/cm3, respectively. Microscopic analysis revealed that the optimized sintering process resulted in the formation of a compact enamel shell on the ceramsite surface, leading to uniformly distributed pores and a dense skeletal structure inside the ceramsite, thereby achieving the high-strength and lightweight properties. This study offers valuable insights for the efficient utilization of foundry solid waste. © 2024, The Authors. All rights reserved.

关键词： Sintering

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Engineering Building Blocks of Covalent Organic Frameworks for Boosting Capacitive Charge Storage

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SSRN 2022年

作者： Dong, Yanying Zhang, Xiaofang Wang, Yonglin Tang, Liqiu Yang, Yingkui State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Hubei Engineering Technology Research Centre of Energy Polymer Materials School of Chemistry and Materials Science South-Central Minzu University Wuhan430074 China

Engineering building blocks of covalent organic frameworks (COFs) with tailored active sites and microstructures is efficient in boosting capacitive energy storage. Herein we craft imine-linked COFs built from tri-arylamine knots and di-aldehyde linkers via a well-established Schiff-base condensation. The resulting COFs show enriched redox responses and diverse morphologies including nanoparticles, hollow spheres, and crystalline fibers by altering the knot planarity and the substitutes on linkers. It is disclosed that the coplanarity of building blocks and intramolecular H-bonding dominate the stacking modes of COFs, and accordingly their microstructures, and electrochemical performance. Among such COFs, a hydroquinone-enriched nanofiber-like COF delivers the highest specific capacitance of 235 F g-1 at 0.5 A g-1, which outperforms the most COF-based electrodes reported previously, due to its high planarity, intramolecular H-bonding, ultrahigh specific surface area, and abundant electroactive moieties. This work may unlock an alternative approach to the modularization of pseudocapacitive COFs by enriching redox-active centers and tuning microstructures. © 2022, The Authors. All rights reserved.

关键词： Microstructure

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Low-Energy Synthesis of Zno/Cuo Piezoelectric Catalytic materials Driven by Mechanical Stirring for the Degradation of Organic Pollutants

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SSRN 2023年

作者： Li, Haibo Ma, Wenxia Zeng, Xianglong Liu, Shuming Xiao, Longhao Fang, Zheng Feng, Yuqin Yang, Ming Zhu, Hao Liu, Hongjun Yang, Yongsheng School of Chemistry and Engineering Hu-bei Key Laboratory of Biomass Fibers and Eco-dyeing and Finishing Wuhan Textile University Wuhan430073 China The Key Laboratory of Natural Medicine and Immuno-Engineering Henan University 475004 China Water Technology Research Center AGplus Technologies Co. Ptd 303 Longhai Er Road West Zone Dayawan Guangdong Huizhou516082 China Materials Science and Engineering State Key Laboratory of New Textile Materials and Advanced Processing Technology Wuhan Textile University Wuhan430200 China

The presence of pollutants in aquatic environments is an urgent environmental issue. To address this concern, the present study explores the use of a low-temperature synthesized ZnO/CuO p-n heterojunction as a piezoelectric catalyst, activated through mechanical stirring, for the removal tetracycline (TC) antibiotics. The piezoelectric catalytic activity of various ZnO/CuO ratios was investigated under the influence of a magnetic stirrer. The most effective ZnO/CuO ratio achieved a TC removal efficiency of 98% after 120 minutes. The primary active species responsible for TC degradation were identified as hydroxyl radicals (·OH) and superoxide radicals (·O2-), as evidenced through quenching experiments. The piezoelectric current generated by ZnO/CuO-1.5 was found to be 3.1 and 6.2 times higher than that of pure ZnO and pure CuO, respectively, due to the formation of a p–n heterojunction structure and built-in electric field situation. Experimental findings support a proposed piezoelectric catalytic mechanism. The facile and low-temperature synthesis process, coupled with superior removal rates, provide theoretical support for the large-scale application of ZnO/CuO as a mechanically driven piezoelectric catalyst. © 2023, The Authors. All rights reserved.

关键词： Copper oxides

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A Universal Atomic Substitution Conversion Strategy Towards Synthesis of Large‑Size Ultrathin Nonlayered Two‑Dimensional materials

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Nano-Micro Letters 2021年第11期13卷 79-91页

作者： Mei Zhao Sijie Yang Kenan Zhang Lijie Zhang Ping Chen Sanjun Yang Yang Zhao Xiang Ding Xiaotao Zu Yuan Li Yinghe Zhao Liang Qiao Tianyou Zhai School of Physics University of Electronic Science and Technology of China(UESTC)Chengdu 610054People’s Republic of China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074People’s Republic of China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province Institute of New Materials and Industrial TechnologiesCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035People’s Republic of China

Nonlayered two-dimensional(2D)materials have attracted increasing attention,due to novel physical properties,unique surface structure,and high compatibility with microfabrication ***,owing to the inherent strong covalent bonds,the direct synthesis of 2D planar structure from nonlayered materials,especially for the realization of large-size ultrathin 2D nonlayered materials,is still a huge ***,a general atomic substitution conversion strategy is proposed to synthesize large-size,ultrathin nonlayered 2D *** nonlayered CdS as a typical example,large-size ultrathin nonlayered CdS single-crystalline flakes are successfully achieved via a facile low-temperature chemical sulfurization method,where pre-grown layered CdI2 flakes are employed as the precursor via a simple hot plate assisted vertical vapor deposition *** size and thickness of CdS flakes can be controlled by the CdI2 *** growth mechanism is ascribed to the chemical substitution reaction from I to S atoms between CdI2 and CdS,which has been evidenced by experiments and theoretical *** atomic substitution conversion strategy demonstrates that the existing 2D layered materials can serve as the precursor for difficult-to-synthesize nonlayered 2D materials,providing a bridge between layered and nonlayered materials,meanwhile realizing the fabrication of large-size ultrathin nonlayered 2D materials.

关键词： Nonlayered 2D materials Large-size ultrathin CdS flakes Atomic substitution conversion Layered-nonlayered structural transformation

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Stabilizing Zinc Anodes with Sodium Lignosulfonate-Doped Polypyrrole

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SSRN 2024年

作者： Ni, Yaqi Liu, Qifan Xue, Tao Zang, Limin Qiu, Jianhui Yu, Xiuwen Zhang, Jiali Yang, Chao MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges Universities Key Laboratory of Natural and Biomedical Polymer Materials Guilin University of Technology Guilin541004 China Guangxi Colleges Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization School of Materials and Environment Guangxi Minzu University Nanning530105 China Department of Machine Intelligence and Systems Engineering Faculty of Systems Science and Technology Akita Prefectural University Yurihonjo015-0055 Japan

Despite zinc-based electrochemical energy storage being considered a safe and efficient energy storage system, problems such as uncontrolled dendrite growth, hydrogen precipitation reactions, and corrosion have seriously hindered its commercialization. Mitigating dendrite growth and other associated issues is crucial for the successful commercialization of these systems. Herein, we propose a sodium lignosulfonate-doped polypyrrole protective layer for zinc anodes with good hydrophilicity, electrical conductivity, and a porous structure, which can effectively inhibit the growth of zinc dendrites and the side reactions. The doping of sodium lignosulfonate introduces numerous zincophilic groups. The sulfonic acid groups enhance zinc ion interaction and regulate flux, while phenolic hydroxyl groups increase zincophilic sites, aiding in the uniform deposition of zinc. As expected, the Zn||Zn symmetric cell with this protective layer provides high cycling stability of more than 1960 hours at 0.5 mAh cm-2, 0.25 mA cm-2. This study presents a feasible approach for realizing stable zinc anodes. © 2024, The Authors. All rights reserved.

关键词： Polypyrroles

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Facile and Scalable Fabrication of Stretchable Flame-Resistant Yarn for Temperature Monitoring and Strain Sensing

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SSRN 2022年

作者： Zou, Sizhuo Wang, Yu Li, Daiqi Zhang, Yingying Cai, Guangming State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Key Laboratory of Organic Optoelectronics and Molecular Engineering The Ministry of Education Department of Chemistry Tsinghua University Beijing100084 China

Electronic textiles with functions of temperature monitoring and human motion detection have attracted considerable interest, especially those which can be operated under extreme conditions such as high temperature. However, the restricted working conditions and poor stretchability have limited the practical application of most reported electronic textiles. Herein, we report a facile and scalable strategy to fabricate flame-resistant sensing yarn with a core–sheath structure for temperature monitoring and strain sensor applications via a large-scale spinning technique. The hierarchical yarn comprises a spandex filament as the core, carbon nanotube (CNT)-coated aramid fibers as the middle layer, and aramid fibers as the sheath. The obtained spandex/CNT@Aramid/Aramid (SCAA) yarn exhibited stretchability up to 160% with excellent thermal resistance, outstanding thermal insulation performance, and temperature monitoring ability within a wide-range of 50–400 °C. Additionally, SCAA-based textiles showed excellent strain sensing performance in a wide operating temperature range (0–300 °C). Based on the above, a SCAA-based textiles which can transmit high-temperature alarms through active (stretching) and passive (thermosensation) modes was designed, enabling temperature monitoring presenting at extremely high temperatures. We believe this work will contribute to the development of practical sensing e-textiles towards applications in harsh environment. © 2022, The Authors. All rights reserved.

关键词： Thermal insulation

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Versatile Preparation of Jellyfish-Inspired Color Transition Hydrogels Via Polymerization Induced Supramolecular Geletion （Pisg）

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SSRN 2024年

作者： Feng, Anchao Gao, Chao Wang, Xiaowei Wu, Boyu He, Chen Bai, Yifan Thang, San H. State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Beijing Key Laboratory of Preparation and Processing of New Polymer Materials Beijing University of Chemical Technology Beijing100029 China Aerospace Research Institute of Materials & Processing Technology Beijing100076 China School of Chemistry Monash University ClaytonVIC3800 Australia

Supramolecular hydrogels based on host–guest interactions constitute a class of intriguing soft matter and have attracted great attention due to their unique properties, etc. In this study, we successfully synthesized 4-methylene-7-diethylaminocoumarin methacrylate (DEACMMA) monomer and carried out reversible addition-fragmentation chain transfer (RAFT) polymerization using methylated β-cyclodextrin via a host-guest encapsulation mechanism. This process led to the formation of ternary copolymer hydrogel supramolecular photoresponsive hydrogels through polymerization induced supramolecular gelation (PISG). The encapsulation of coumarin monomers by methylated cyclodextrins was confirmed using 2D ROESY NMR and fluorescence spectroscopy. We have carefully analyzed the microstructure of these supramolecular hydrogels by rheological profiles and scanning electron microscopy (SEM). Stimulated by UV light, the copolymers transition from non-luminescence to a bright fluorescent blue color, which is reminiscent of the self-transforming colors observed in jellyfish. The development of photostimuli-responsive hydrogels based on methylated β-cyclodextrin-coated coumarin esters opens new avenues in the fields of smart materials and clinical medicine. © 2024, The Authors. All rights reserved.

关键词： Cyclodextrins

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Atomic Layered IR Constructed Ultrasmall Pdir Core-Shell Nanoparticles as Robust Water Splitting Electrocatalyst in Acid

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SSRN 2022年

作者： Xie, Yuhua Chang, Chaofeng Luo, Fang Yang, Zehui Sustainable Energy Laboratory Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo RD Wuhan430074 China State Key Laboratory for Hubei New Textile Materials and Advanced Processing Technology School of Materials Science and Engineering Wuhan Textile University Wuhan430200 China

The realization of commercialization of proton electrolyte membrane water splitting (PEMWS) significantly depends on the anodic electrocatalyst working at high potential and strong acidic condition requiring superior oxygen evolution reaction (OER) activity and stability. In this manuscript, we devise the construction of ultrasmall Pd@Ir core-shell nanoparticles (3 nm) with atom layer Ir (3 atomic layers) on carbon nanotubes (Pd@Ir/CNT) as exceptional bifunctional electrocatalyst in acidic water splitting. Due to the core-shell structure, strain generated at heterointerfaces leads to an upshifted d band center of Ir atoms contributing to a 123-fold better mass activity at 1.63 V vs. RHE than commercial IrO 2;besides, the electronic hybridization suppresses the electrochemical dissolution of Ir;as a result, a robust stability is also achieved. In hydrogen evolution reaction (HER) catalysis, Pd@Ir/CNT also exhibits a 7.4-time higher mass activity than Pt/C. Furthermore, only 1.7 V is needed to reach water splitting current density of 100 mA cm -2 , 251 mV lower than Pt/C-IrO 2 indicating its exceptionality in acidic water splitting. © 2022, The Authors. All rights reserved.

关键词： Core shell nanoparticles

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Domain Evolution, Dielectric and Piezoelectric Response in Bent Freestanding PbTiO3 Ferroelectric Nanowires

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SSRN 2024年

作者： Zhou, Meng-Jun Peng, Kun Tan, Yueze Yang, Tiannan Chen, Long-Qing Nan, Ce-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Department of Materials Science and Engineering Materials Research Institute The Pennsylvania State University University ParkPA16802 United States School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing100084 China

Ferroelectric oxides with excellent flexibility are of significant practical and theoretical interests in recent studies. With most up-to-date research efforts, the effect of large bending on properties of nano-scale ferroelectric materials is still to be investigated. In this work, we elucidate the effect of bending angle on ferroelectric domain structures and material properties of bending PbTiO3 nanowires using phase-field simulations and thermodynamic modeling. We find non-monotonic dependencies of the coercive fields, dielectric responses and piezoelectric properties on the bending angle. A maximum enhancement of 462% and 226% in the dielectric constant and piezoelectric coefficient, respectively, is achieved at an 18° bending angle for the PbTiO3 nanowire with a radius of R = 10 nm and length L=100 nm, which is attributed to the formation of strong-response zones within the nanowire as illustrated by both the phase-field and thermodynamic analysis. The current work provides useful theoretical insights for the experimental explorations into ferroelectric functionalities of nanomaterials and potential applications of high-performance flexible ferroelectric-based nanodevices. © 2024, The Authors. All rights reserved.

关键词： Piezoelectricity

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The Effect of Sr Doping at the A-Sites on the Performance of La0.5gd0.5ba1− X Sr X Co2o5+ Δ Double Perovskite materials

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SSRN 2023年

作者： Wei, Ze Xiong, Xueqing Chen, Xiyong Pan, Juntao Cai, Donglin Huang, Xiaomei Han, Gang Liu, Yihui Jiang, Zezuo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured Materials School of Resources Environment and Materials Guangxi University Guangxi Nanning530004 China Hubei Key Laboratory of Advanced Technology for Automotive Components & Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Hubei Wuhan430070 China Chongzuo Key Laboratory of Rare-earth-based New Powder Materials with Special Properties Guosheng Rare Earth New Materials Co. Ltd. Guangxi Chongzuo532200 China

La0.5Gd0.5Ba1−xSrxCo2O5+δ (x=0–0.5) perovskite cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs) were prepared by a solid-state reaction method, and the crystal structures, thermal expansion coefficients, defect chemistries, and electrochemical properties of the cathode materials were studied. X-ray diffraction showed that with the doping level increase of Sr, the materials underwent a transformation from a tetragonal phase to a cubic phase. The materials retained good chemical compatibility with the Ce0.9Gd0.1O1.95 electrolyte at 1100°C. The thermal expansion coefficients decreased with the increase of Sr doping level, while the number of oxygen vacancies and the surface oxygen concentration increased. The conductivities of all the samples were measured above 100 S/cm at 400 to 700°C in air, and the conductivity of LGBCOSr-0.5 (x = 0.5, with a single perovskite) at 400°C reached up to 1034 S/cm. The cathodic polarization and characteristic capacitance obtained from the DRT (distribution of relaxation times) analysis of the electrochemical impedanceshowed that the addition of strontium improved the transport of oxygen ions and charge transfer in the cathodic redox processes. These results indicate that La0.5Gd0.5Ba0.5Sr0.5Co2O5+δ is a promising cathode material for IT-SOFCs. © 2023, The Authors. All rights reserved.

关键词： Cathodes

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