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Toughening and Responsive Contractile Shape Memory Fibrous Membrane via Water for Mechanically Active Wound Dressing

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advanced Fiber materials 2024年第6期6卷 1942-1954页

作者： Wen Liu Wei Zhao Kunrong Xie Xue Feng Li Yufu Wang Deyan Kong Yanju Liu Jinsong Leng National Key Laboratory of Science and Technology On Advanced Composites in Special Environment Harbin Institute of TechnologyHarbin 150080People’s Republic of China Department of Astronautical Science and Mechanics Harbin Institute of Technology(HIT)No.92 West Dazhi StreetP.O.Box 301Harbin 150001People’s Republic of China Department of Orthopedic Surgery Second Affiliated Hospital of Harbin Medical UniversityNo.246Baojian RoadHarbin 150086People’s Republic of China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyNo.92West Dazhi StreetHarbin 150001People’s Republic of China

Conventional wound dressings only protect passively against bacterial *** mechanically active adhesive dressings(AADs)are inspired by the active closure of embryonic *** can promote wound healing by actively con-tracting the wound *** meet the requirements of high toughness,stimulus-response,and dynamic adhesion proper-ties,which are ***,we construct a water-responsive shape memory polyurea fibrous membrane(PU-fm)featuring favorable toughness,wet-adhesion,breathability,absorbency of four times its weight,and ***,the water-toughened electrospun PU-fm is fabricated using a homemade polyurea(PU)elastomer with multistage hydrogen bond networks as a spinning ***,a Janus-structured polyurea-polydopamine-silver fibrous membrane(PU@PDA@Ag-fm)is engineered,integrating antibacterial properties without compromising mechanical *** demonstrates strong adhesion to the skin,actively promotes wound contraction,and enables adaptive wrapping of tissues of varying sizes by the water-driven shape memory *** tests and wound healing experiments indicate that the PU@PDA@Ag-fm has favorable antibacterial properties against Escherichia coli(***)and accelerates the wound healing rate by 20%.For the first time,water-responsive shape memory PU-fm as the AADs is constructed,providing a new strategy for wound *** can be extended to applications in other smart devices for biomedicine such as tendon repair,and bioelectronic interfaces.

关键词： Mechanically active dressing Electrospun fibrous membrane Janus structure Water-responsive shape memory

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Characterization of the Root Surface of a Friction Stir Welded Uns S32760 Super Duplex Stainless Steel: Insights into its Microstructure and Corrosion Resistance

SSRN

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SSRN 2023年

作者： Vacchi, G.S. de Carvalho, Willian S. Meinhardt, C.P. Bergmann, Luciano A. Amancio-Filho, Sergio T. Rovere, C.A.D. Munir Rachid Corrosion Laboratory Department of Materials Engineering Federal University of São Carlos Rodovia Washington Luis Km 235 SP São Carlos13565-905 Brazil Federal University of São Carlos Graduate Program in Materials Science and Engineering Brazil Graz University of Technology – TU Graz Institute of Materials Science Joining and Forming BMK Endowed Professorship for Aviation Kopernikusgasse 24/1 Graz8010 Austria Federal University of Pampa Department of Mechanical Engineering Avenida Tiarajú 810 RS Alegrete Brazil Helmholtz-Zentrum Hereon Institute of Materials Mechanics Solid State Materials Processing Max-Planck-Straße 1 Geesthacht Germany

The root surface of a friction stir welded super duplex stainless steel (UNS S32760) was thoroughly characterized in this study. The findings revealed a refined grain structure and a conspicuous increase of 50 HV0.3 in the Root's hardness. Interestingly, the volume fraction of the ferrite phase remained largely unchanged. Rapid cooling in the welding process led to the Cr2N precipitation at the ferrite/ferrite grain boundaries in the root area, significantly increasing sensitization, reducing localized corrosion resistance under high potentials in a neutral pH saline environment, and adversely affecting root passivity in a hydrochloric acid environment compared to the base metal. © 2023, The Authors. All rights reserved.

关键词： Friction stir welding

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Edge detection imaging by quasi-bound states in the continuum

arXiv

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arXiv 2024年

作者： Liu, Tingting Qiu, Jumin Xu, Lei Qin, Meibao Wan, Lipeng Yu, Tianbao Liu, Qiegen Huang, Lujun Xiao, Shuyuan School of Information Engineering Nanchang University Nanchang330031 China Institute for Advanced Study Nanchang University Nanchang330031 China School of Physics and Materials Science Nanchang University Nanchang330031 China Advanced Optics and Photonics Laboratory Department of Engineering School of Science and Technology Nottingham Trent University NottinghamNG11 8NS United Kingdom School of Education Nanchang Institute of Science and Technology Nanchang330108 China School of Physics and Electronic Science East China Normal University Shanghai200241 China

Optical metasurfaces have revolutionized analog computing and image processing at sub-wavelength scales with faster speed and lower power consumption. They typically involve spatial differentiation with engineered angular dispersion. Quasi-bound states in the continuum (quasi-BICs) have recently emerged as a powerful tool for tailoring properties of optical resonances. While quasi-BICs have been explored in various applications that require high Q-factors and enhanced field confinement, their full potential in image processing remains unexplored. Here, we demonstrate edge detection imaging by leveraging a quasi-BIC in an all-dielectric metasurface. This metasurface, composed of four nanodisks per unit cell, supports a polarization-independent quasi-BIC through structural perturbations, allowing simultaneously engineering Q-factor and angular dispersion. Importantly, we find that with suitable parameters, this quasi-BIC metasurface can perform isotropic two-dimensional spatial differentiation, which is the core element for realizing edge detection. Following the theoretical design, we fabricate the metasurfaces on the silicon-on-insulator platform and experimentally validate their capability of high-quality, efficient, and uniform edge detection imaging under different incident polarizations. Our results illuminate the mechanisms of edge detection with quasi-BIC metasurfaces and highlight new opportunities for their application in ultra-compact, low-power optical computing devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Silicon on insulator technology

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Bioinspired wet-resistant organogel for highly sensitive mechanical perception

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science China materials 2022年第8期65卷 2262-2273页

作者： Wen Zhao Dingli Gan Xinyu Qu Jingying Liu Yunlong Liu Qian Wang Wenjun Wang Chencheng Sun Xiaochen Dong Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) School of Physical and Mathematical SciencesNanjing Tech University(NanjingTech)Nanjing 211816China School of Physical Science and Information Technology Liaocheng UniversityLiaocheng 252059China School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China

Smart flexible electronics with underwater motion detection have become a promising research aspect in intelligent *** by the strong adaptability of marine creatures to complex underwater environments,conventional biocompatible hydrogels are worth developing into organogels with preferred underwater adhesive properties,hydrophobic and antiswelling performance,and motion perception ***,a highly sensitive organogel sensor exhibiting good hydrophobicity,electromechanical properties,and adhesion properties was prepared for underwater utilization by regulating the chemical components and internal *** synergistic effect of massive reversible noncovalent bonds ensures the organogel’s excellent underwater adhesion to multifarious ***,the interactions of hydrophobic conductive fillers and the dynamic hydrophobic associations in the organogel endow it with satisfactory hydrophobic performance(contact angle of111.8°)and antiswelling property(equilibrium swelling ratio of-31%after 15-day immersion).The fabricated flexible organogel strain sensor exhibits high sensitivity(gauge factor of1.96),ultrafast response rate(79.1 ms),low limit of detection(0.45 Pa),and excellent cyclic stability(1044 tensile cycles followed by 3981 compressive cycles).Results demonstrate the proposed organogel’s precise perception of sophisticated human motions in air and underwater,which expands its application scenarios.

关键词： flexible electronics organogel hydrophobic association water-resistant underwater application

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Comparison of CMAS corrosion and sintering induced microstructural characteristics of APS thermal barrier coatings

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Journal of materials science & technology 2019年第3期35卷 440-447页

作者： Yiyou Wu Hua Luo Canying Cai Yanguo Wang Yichun Zhou Li Yang Guangwen Zhou School of Materials Science and Engineering Xiangtan University Key Laboratory of Low Dimensional Materials & Application Technology of Ministry of Education Xiangtan University Department of Mechanical Engineering & Materials Science and Engineering Program State University of New York at Binghamton

The microstructural features of high-temperature sintered and CaO-MgO-Al_2O_3-SiO_2(CMAS) corroded air plasma sprayed Y_2O_3 stabilized ZrO_2(YSZ) thermal barrier coatings(TBCs) under the thermal gradient condition were comparatively studied. As-sprayed YSZ has a lamellar structure and the lamellae are composed of closely aligned columnar crystals. The sintered and the CMAS corroded YSZ coatings maintain the t'-ZrO_2 phase as the as-sprayed YSZ coating. The sintered YSZ remains the lamellar structure with reduced interlamellar gaps and grains coarsening. After the CMAS corrosion, the top layer of the YSZ coating keeps its lamellar structure consisting of some columnar grains with the CMAS infiltration into the intergrain gaps and the formation of striped Zr_2Y_2 O_7. The typical lamellar structure transforms into more equiaxed grains in the middle and bottom layers of the ceramic coating along with significant infiltration of amorphous CMAS and anorthite formation in the bottom layer owing to the high contents of Ca and Al.

关键词： YSZ thermal barrier coating APS CMAS corrosion Anorthite

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Recycling of Waste Glass to Fabricate Different Morphological Sic Absorbers

SSRN

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SSRN 2023年

作者： Wang, Jinyan Zhou, Jintang Harm, Van Zalinge Chen, Zhiping Yao, Zhengjun Yang, Li Department of Electrical Engineering and Electronics University of Liverpool LiverpoolL69 3GJ United Kingdom College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Jiangsu Nanjing211100 China Department of Chemistry Xi'an Jiaotong-Liverpool University Jiangsu Suzhou215123 China Advanced Materials Research Institute Jiangsu Suzhou215123 China

Resource utilisation is the most favourable way to deal with industrial solid waste. However, there is only 21% of waste glass can be recycled. This article presents a facile synthesis of different morphological silicon carbides (SiC) using waste glass as silicon resources. The morphology of the products is closely associated with the weight concentration of waste glass powder. The sample's microstructure changed from fluffy spherical to fibrous with decreased waste glass powder. The electromagnetic wave(EMW) absorbing results show that the fluffy spherical SiC possesses the optimal EMW absorption performance with effective absorption bandwidth 4.81 GHz at 1.6 mm. By comparison, the EMW absorbing ability of SiC obtained through waste glass powder is better than the normal SiC prepared through commercial SiO2. Thus, the wasted glass has shown great promise as silicon resources to prepare high-performance SiC absorbers. The study can help people to make better use of waste glass and widen the use of high-performance SiC absorbers. © 2023, The Authors. All rights reserved.

关键词： Silicon carbide

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Improving the performance of inkjet printed QLED by annealing post-treatment

Improving the performance of inkjet printed QLED by annealin...

引用

International Conference on Display technology, ICDT 2021

作者： Jia, Siqi Ma, Jingrui Qu, Xiangwei Tang, Haodong Wu, Zhenghui Xu, Bing Liu, Pai Li, Guangyu Wang, Kai Sun, Xiao Wei Ministry of Education and Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and Engineering Jilin University Renmin Street No. 5988 Changchun130025 China Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Southern University of Science and Technology Shenzhen518055 China Shenzhen Planck Innovation Technologies Co. Ltd Shenzhen China

The quantum dot light-emitting diodes (QLEDs) by inkjet printing are promising candidates for lighting and display applications of the industry. Herein, we report an inkjet printed QLED, showing that the luminance of red QLED is as high as 185, 607 cd/m2, the external quantum efficiency reaches 12.6 %, and the lifetime (T95) is 549 h @ 1000 cd/m2, which is one of the highest reported for a very primitive device structure. © 2021, John Wiley and Sons Inc. All rights reserved.

关键词： Semiconductor quantum dots

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Ionic liquids for CO_(2) electrochemical reduction

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Chinese Journal of Chemical engineering 2021年第3期34卷 75-93页

作者： Fangfang Li Francesca Mocci Xiangping Zhang Xiaoyan Ji Aatto Laaksonen Energy Engineering Division of Energy ScienceLuleåUniversity of TechnologyLuleå97187Sweden Department of Chemical and Geological Sciences University of CagliariMonserrato 09042Italy CAS Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Division of Physical Chemistry Department of Materials and Environmental ChemistryArrhenius LaboratoryStockholm UniversityStockholm 10691Sweden Center of Advanced Research in Bionanocojugates and Biopolymers “Petru Poni”Institute of Macromolecular ChemistryIasi 700469Romania State Key Laboratory of Materials-Oriented and Chemical Engineering Nanjing Tech UniversityNanjing 211816China

Electrochemical reduction of CO_(2) is a novel research field towards a CO_(2)-neutral global economy and combating fast accelerating and disastrous climate changes while finding new solutions to store renewable energy in value-added chemicals and *** liquids(ILs),as medium and catalysts(or supporting part of catalysts)have been given wide attention in the electrochemical CO_(2) reduction reaction(CO_(2) RR)due to their unique advantages in lowering overpotential and improving the product selectivity,as well as their designable and tunable *** this review,we have summarized the recent progress of CO_(2) electro-reduction in IL-based electrolytes to produce higher-value *** then have highlighted the unique enhancing effect of ILs on CO_(2) RR as templates,precursors,and surface functional moieties of electrocatalytic ***,computational chemistry tools utilized to understand how the ILs facilitate the CO_(2) RR or to propose the reaction mechanisms,generated intermediates and products have been discussed.

关键词： Carbon dioxide Ionic liquids Electro-reduction Electrolyte Electrocatalytic material Computer simulation

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Role of Alloy Grain Boundaries in the High-Temperature Oxidation and Cr Volatilization of 22 Wt.% Cr Ferritic Stainless Steel for Sofc Applications

SSRN

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SSRN 2022年

作者： Kim, Byung Kyu Ko, Yoon Seok Jung, In-Ho Han, Heung Nam Yi, Kyung-Woo Kim, Dong-Ik Energy Materials Research Center Korea Institute of Science and Technology 5 Hwarangro 14-gil Seongbuk-gu Seoul02792 Korea Republic of Department of Materials Science and Engineering Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Research Institute of Advanced Materials Korea Republic of

The effects of the alloy grain size of high-Cr ferritic stainless steel were investigated using a sheet (t = 2 mm) and plate (t = 22 mm) of Cr ferritic stainless steel. The measured average grain size of the samples was ~ 25 μm and ~ 500 μm, respectively. The large-grained plate sample exhibited a 41% reduction in oxidation rate, and a slight decrease in Cr volatilization was observed in the small-grained sheet sample. Numerical analysis revealed that inhomogeneous GB-related oxidation is a major cause of differences in oxidation kinetics affected by metal grain size. © 2022, The Authors. All rights reserved.

关键词： Ferrite

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Surpassing electrocatalytic limit of earth-abundant Fe^(4+)embedded in N-doped graphene for(photo)electrocatalytic water oxidation

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Journal of Energy Chemistry 2021年第3期30卷 274-281页

作者： Wenjia Xue Feng Cheng Menglu Li Wenjian Hu Congping Wu Bing Wang Kuowei Liao ZhenTao Yu Yingfang Yao Wenjun Luo Zhigang Zou Eco-materials and Renewable Energy Research Center(ERERC) College of Engineering and Applied SciencesNanjing UniversityNanjing 210093JiangsuChina Key Laboratory for Advanced Technology in Environment Protection of Jiangsu Province Vancheng Institute of TechnologyYancheng 224051JiangsuChina Jiangsu Key Laboratory for Nano Technology National Laboratory of Solid State MicrostructvresDepartment of PhysicsNanjing UniversityNanjing 210093JiangsuChina Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093JiangsuChina Kunshan Innovation Institute of Nanjing University Suzhou 215347JiangsuChina School of Science and Engineering The Chinese University of Hong KongShenzhen2001 Longxiang BlvdLonggang DistrictShenzhen 518172GuangdongChina Macao Institute of Systems Engineering Macao University of Science and TechnologyMacao 999078China Huazhong University of Science and Technology Wuhan National Laboratory for OptoelectronicsWuhan 430074HubeiChina

Developing highly active,cost-effective,and environmental friendly oxygen evolution reaction(OER)electrocatalysts facilitates various(photo)electrochemical *** this work,Fe3N nanoparticles encapsulated into N-doped graphene nanoshells(Fe_(3)N@NG)as OER electrocatalysts in alkaline media were *** the experimental and theoretical comparison between Fe_(3) N@NG and Fe_(3)N/NG,specifically including in situ Mossbauer analyses,demonstrated that the NG nanoshells improved interfacial electron transfer process from Fe_(3)N to NG to form high-valence Fe^(4+)ions(Fe^(4+)@NG),thus modifying electronic properties of the outer NG shells and subsequently electron transfer from oxygen intermediate to NG nanoshells for OER catalytic ***,the NG nanoshells also protected Fe-based cores from forming OER inactive and insulated Fe_(2)O_(3),leading to high OER *** a result,the as-formed Fe^(4+)@NG shows one of the highest electrocatalytic efficiency among reported Fe-based OER electrocatalysts,which can as well highly improve the photoelectrochemical water oxidation when used as the cocatalysts for the Fe_(2)O_(3) nanoarray photoanode.

关键词： Fe(Ⅳ) Photoelectrochemistry Water oxidation Oxygen evolution reaction

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