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SSRN 2023年

作者： Shi, Qingwen Liang, Jinxing Wang, Xuyi Yao, Kaixiang Tang, Yidan Pan, Chen Sun, Jiuxiao Liu, Rui Tan, Haiying Tang, Tao State Key Laboratory of New Textile Materials and Advanced Processing Technologies Key Laboratory of Textile Fiber and Products of Ministry of Education College of Materials Science and Engineering Wuhan Textile University Wuhan430200 China School of Computer Science and Artificial Intelligence Wuhan Textile University Wuhan430200 China High-Tech Organic Fibers Key Laboratory of Sichuan Province and China Bluestar Chengrand Co. Ltd China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun130022 China

Fire detection plays a crucial role in maintaining the safety of people's lives and property. However, most early fire detectors are designed to monitor the current or voltage changes of the sensing materials, which require external power supplies. It is still a challenge to make rapid and accurate noncontact early fire detection in precombustion due to the lack of reliable alarm signals. Herein, inspired by the discoloration of chameleon skin, we developed an early fire warning sensor (EFWS) by coating photonic crystals (PCs) on a plastic sheet with thermal expansion properties. Monodispersed zinc sulfide (ZnS) was coated on the plastic sheet as abnormal detection component for EFWS. Combined with the intelligent image recognition algorithm, the EFWS was designed and gave warnings for 0.9s at 260 °C. For the first time, a non-contact real-time monitoring strategy based on PCs EFWS in precombustion is developed. The sensing material can be directly pasted on the surface of the detected equipment, and combined with existing surveillance cameras in the detection area, early warning of fires can be achieved without additional equipment. The EFWS system can be used in fire alarms for aircraft, buildings, electrical appliances, substations, and other places in the future. © 2023, The Authors. All rights reserved.

关键词： Zinc sulfide

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One-Pot Synthesis of Nitrogen-Doped Carbonized Polymer Dots with Tunable Emission for Multicolor Light-Emitting Diodes

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SSRN 2022年

作者： Zhao, Liuxi Cao, Xiyue Jang, Xuanfeng Zhang, Yuhong Shang, Bin Sun, Zhengguang Zhan, Yuan Key Laboratory for the Green Preparation and Application of Functional Materials Ministry of Education Hubei Key Laboratory of Polymer Materials School of Materials Science and Engineering Hubei University Wuhan430062 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies School of Materials Science and Engineering Wuhan Textile University Wuhan430200 China

Carbonized polymer dots (CPDs) have highly potential application value in the field of optoelectronic devices due to their preferable stability, excellent optical properties and favorable biocompatibility. Here, the nitrogen-doped carbonized polymer dots (HNCDs) with self-quenching-resistant fluorescence were prepared via a simple solvothermal with citric acid, urea and 2-hydroxyethyl methacrylate (HEMA) as raw materials. The structure and luminescence properties of the HNCDs have been explored in detail by various contrast experiments. The results show that HEMA form the poly(HEMA) to modify on the surface of carbonized core, which can overcome the quenching effect of carbonized core. The nitrogen doping has great effect on the red shift emission of solid-state HNCDs. Furthermore, the HNCDs exhibit concentration-dependent emission, which lead to their emission red shifted from blue to red with increasing concentration. The HNCDs were further applied to construct the light-emitting diodes (LEDs), and the multicolor LEDs ranging from blue to red can be prepared by simply varying the type of chips and adjusting the concentration of HNCDs in encapsulating material. © 2022, The Authors. All rights reserved.

关键词： Urea

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气体灌注超润湿膜分离溶质

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Science Bulletin 2023年第24期68卷 3111-3113页

作者：董莹李静阳晓宇 Department of Forensic Medicine Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Laoshan Laboratory Wuhan University of TechnologyWuhan 430070China School of Engineering and Applied Sciences Harvard UniversityCambridge MA 02138USA

Membranes,including those that are based on nanofiltration and reverse osmosis(RO),have become important components of systems used for efficient removal of ions and small molecules from *** containing nanofiltration membranes are employed to separate divalent ions and>200 g mol-1molecules utilizing size-and charge-exclusion mechanisms.

关键词： mechanisms utilizing charge

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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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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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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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3d Spiral Model of the Wicking Effect For Continuous Polyester Filaments

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SSRN 2022年

作者： He, Jiahao Li, Jiugang Yang, Qiang Xie, Zhiyun Jin, Xinpeng Sun, Xiaoxi Zhang, Wenlu Liu, Zhijiang Xu, Xiaopeng Xu, Weilin Li, Wenbin Guo, Jing School of Textile and Material Engineering Dalian Polytechinc University Dalian116000 China State Key Laboratory of New Textile Materials and Advanced Processing Technology of Hubei Province Wuhan430200 China College of Textile Science and Engineering Wuhan Textile University Wuhan430200 China

The wicking effect is one of the main factors to promote the afflux and transfer of liquid water in yarn and fabric. It is of great significance to the subsequent processing of products, especially the immersion and interface bonding of textile matrix composites. Twist impacts the arrangement and tightness of fibers inside the yarn and the wicking channel of liquid water. A mathematical model based on the three-dimensional helical capillary permeation mechanism related to twisting is established by assuming that the fibers in the yarn are uniform in diameter and arrangement. With the macroscopic force balance method, the function of liquid capillary rise with wicking time was deduced, and the rising state of liquid water in the yarn was simulated by Comsol. Subsequently, a series of wicking experiments were conducted on polyester filament yarns with different twists to verify the accuracy of the model. The results revealed that the experimental data coincided well with the theoretical prediction. © 2022, The Authors. All rights reserved.

关键词： Yarn

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