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Metal ion-promoted fabrication of melanin-like poly(L-DOPA)nanoparticles for photothermal actuation

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Science China Chemistry 2020年第9期63卷 1295-1305页

作者： Xianheng Wang Lei Yang Peng Yang Wancai Guo Quan-Ping Zhang Xianhu Liu Yiwen Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China State Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002China

Melanin-inspired polymers are currently the focus of growing interest for a wide range of applications ranging from energy to biomedical *** researchers have made numerous attempts to prepare and utilize polydopamine nanoparticles(PDA NPs),they have made limited progress in developing and discovering another typical functional mimic of natural melanin,poly(levodopa)(P(L-DOPA))NPs,probably due to the lack of facile synthetic strategies towards satisfactory structural and functional control of melanin-like ***,we reported a one-pot preparation method towards P(L-DOPA)NPs with good yields and controllable size/property in an aqueous solution assisted by various metal ions(i.e.,Ni(II),Mg(II),Ca(II),Fe(III),Mn(II),Co(II),Zn(II)and Cd(II)).Interestingly,the resulting P(L-DOPA)NPs exhibited enhanced light absorption and photothermal behaviors compared with well-established PDA NPs,which can be employed to further fabricate kinds of photothermal composite actuators with promising performances such as folding,switching,and *** study offers a facile and robust way to synthesize new synthetic melanins beyond PDA,and facilitates further functional discovery and evolution of melanin-inspired polymers and composites.

关键词： melanin poly(L-DOPA)nanoparticle metal ion photothermal actuator

The Ordered Lattice Host Framework Induced Guest Li+ Disordering in High Performance Cobalt-Free Ni-Rich Cathode materials

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SSRN 2024年

作者： Xu, Jia Zhang, Xiaoyu Sun, Shixiong Fu, Rong Cheng, Fangyuan Wei, Peng Li, Qing Fang, Chun Lin, He Han, Jiantao State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China School of Materials Science and Engineering State Key Laboratory of Advanced Special Steel Shanghai University Shanghai200444 China School of Mathematical and Physical Sciences University of Technology SydneyNSW2007 Australia Shanghai Synchrotron Radiation Facility Zhangjiang Lab Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201204 China

Recently, due to high price, resource shortage and unstable supply of cobalt, the development of low-cost cobalt-free Ni-rich cathodes has attracted extensive attention with the ever-increasing lithium-ion batteries (LIBs) industry. Selecting cost-effective elements to replace cobalt in Ni-rich cathodes is urgent. However, the principle of structural design of Ni-rich cathode remains unclear, hampering the selection of alternative elements. Herein, the cobalt-free cathodes of LiNi0.95Mg0.05O2 (NiMg) and LiNi0.95Mn0.05O2 (NiMn) are designed as alternatives to LiNi0.96Co0.04O2 (NiCo). NiMg has comparable cycle stability with NiCo, while NiMn has inferior cycle performance. Reverse Monte Carlo modelling was used to generate structural model and uncover local structure by fitting pair distribution function. It reveals Mn causes more severe Jahn-Teller distortions and disordered lattice host framework (Ni0.95M0.05O2, M = Co/Mn/Mg) than Co and Mg due to the strong size effect and coulomb interactions of Mn in Ni0.95Mn0.05O2 layer. The outstanding cycle stability of NiMg and NiCo originates from the ordered lattice host frameworks, which relieve stress and inhibit particle breakage during cycle. Meanwhile, the ordered lattice host framework induced guest Li+ disordering reduces Li+ diffusion energy barrier, improving the rate capability. This study provides a new perspective for the structural design of cobalt-free Ni-rich cathodes. © 2024, The Authors. All rights reserved.

关键词： Cathodes

Simulation of local contact conditions in the secondary shear zone in dry and wet metal cutting 19

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Simulation of local contact conditions in the secondary shea...

19th CIRP Conference on Modeling of Machining Operations, CMMO 2023

作者： Denkena, B. Liu, H.C. Pape, F. Bergmann, B. Poll, G. Schenzel, J. Ellersiek, L. Leibniz Universität Hannover An der Universität 2 Garbsen30823 Germany Leibniz Universität Hannover An der Universität 1 Garbsen30823 Germany State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Qingdao Key Laboratory of Lubrication Technology for Advanced Equipment Center of Resource Chemistry and New Materials Qingdao266100 China

Cutting fluids significantly influence the contact conditions in metal cutting, e.g. stresses or contact areas. Due to the limited accessibility of the chip-tool contact, the identification of contact conditions is challenging. In this paper, a simulation model is created and used to identify the real contact area in dry and wet cutting. Experimentally identified normal stresses and chip-tool roughness serve as input parameters. The results show higher normal stresses in wet cutting, which results in a higher real contact area between rake face and chip. © 2023 Elsevier B.V.. All rights reserved.

关键词： Surface roughness

Elastic properties of Cu-6wt%Ag alloy wires for pulsed magnets investigated by ultrasonic techniques

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arXiv

arXiv 2024年

作者： Li, Ziyu Gu, Tianyi Wei, Wenqi Yuan, Yang Wang, Zhuo Luo, Kangjian Pan, Yupeng Xie, Jianfeng Zhang, Shaozhe Peng, Tao Liu, Lin Chen, Qi Han, Xiaotao Luo, Yongkang Li, Liang Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China School of Physics Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China School of Materials Science and Engineering State Key Lab for Materials Processing and Die & Mold Technology Huazhong University of Science and Technology Wuhan430074 China

Conductor materials with good mechanical performance as well as high electrical- and thermal-conductivities are particularly important to break through the current bottle-neck limit (∼ 100 T) of pulsed magnets. Here we perform systematic studies on the elastic properties of the Cu-6wt%Ag alloy wires, a promising candidate material for the new-generation pulsed magnets, by employing two independent ultrasonic techniques - resonant ultrasound spectroscopy (RUS) and ultrasound pulse-echo experiments. Our RUS measurements manifest that the elastic properties of the Cu-6wt%Ag alloy wires can be improved by an electroplastic drawing procedure as compared with the conventional cold drawing. We also take this chance to test the availability of our newly-built ultrasound pulse-echo facility at Wuhan National High Magnetic Field Center (WHMFC, China), and the results suggest that the elastic performance of the electroplastically-drawn Cu-6wt%Ag alloy wire remains excellent without anomalous softening under extreme conditions, e.g., ultra-high magnetic field up to 50 T, nitrogen / helium cryogenic liquids. © 2024, CC BY.

关键词： Bottles

Crystal Water-Capturing and Film-Forming Bifunctional Electrolyte Additive for Stabilizing Sodium Iron Hexacyanoferrate Cathode for Na-Ion Batteries

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SSRN 2024年

作者： Bai, Xianhai Zhang, Longqing Zhang, Dashui Li, Kaiming Li, Tongcan Ren, Yang He, Huibing Sun, Gang Xie, Bingxing Xu, Jing Yin, Xucai Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China State Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai200237 China School of New Energy Nanjing University of Science and Technology Jiangyin214443 China Shenzhen Key Laboratory of Special Functional Materials Shenzhen Engineering Laboratory for Advance Technology of Ceramics Guangdong Research Center for Interfacial Engineering of Functional Materials Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Materials Science and Engineering Shenzhen University Shenzhen518071 China

Due to its affordability, strong structural stability, and high rate capability, rhombohedral sodium ferrous hexacyanoferrate (FeHCF) has been identified as a potential cathode material for sodium ion batteries. Nevertheless, the presence of inherent crystal water and the susceptibility of its interface stability significantly hinder its capacity and cycling performance. In this study, we propose a novel modification approach involving the addition of ZnCl2 to effectively capture crystal water and facilitate the in situ formation of a ZnO coating on the FeHCF surface. Due to the decreased crystal water content and the presence of stable ZnO interphases, the occurrence of side reactions between the electrode and electrolyte, as well as crystal particle cracks in FeHCF during repeated sodiation/desodiation processes, is effectively reduced. Consequently, the modified FeHCF demonstrates an extended operational lifespan of 1000 cycles, with an initial discharge capacity of 112.0 mAh g−1 and a capacity retention rate of 77.8% at a current rate of 1 C within the voltage range of 2.0-4.2 V. Our research offers valuable insights into the removal of crystal water and the engineering of incident interfaces to enhance the cycle life of FeHCF cathodes in sodium-ion batteries. © 2024, The Authors. All rights reserved.

关键词： Sodium-ion batteries

Harnessing the Unconventional Cubic Phase in 2D LaNiO3Perovskite for Highly Efficient Urea Oxidation

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Angewandte Chemie 2024年第1期137卷

作者： Zhiao Wu Miao Fan Prof. Huiyu Jiang Jiao Dai Kaisi Liu Rong Hu Shutong Qin Prof. Weilin Xu Yonggang Yao Prof. Jun Wan State Key Laboratory of New Textile Materials and Advanced Processing Technologies Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing Wuhan Textile University Wuhan 430200 China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Phase engineering is a critical strategy in electrocatalysis, as it allows for the modulation of electronic, geometric, and chemical properties to directly influence the catalytic performance. Despite its potential, phase engineering remains particularly challenging in thermodynamically stable perovskites, especially in a 2D structure constraint. Herein, we report phase engineering in 2D LaNiO 3 perovskite using the strongly non-equilibrium microwave shock method. This approach enables the synthesis of conventional hexagonal and unconventional trigonal and cubic phases in LaNiO 3 by inducing selective phase transitions at designed temperatures, followed by rapid quenching to allow precise phase control while preserving the 2D porous structure. These phase transitions induce structural distortions in the [LaO] + layers and the hybridization between Ni 3 d and O 2 p states, modifying local charge distribution and enhancing electron transport during the six-electron urea oxidation process (UOR). The cubic LaNiO 3 offers optimal electron transport and active site accessibility due to its high structural symmetry and open interlayer spacing, resulting in a low onset potential of 1.27 V and a Tafel slope of 33.1 mV dec −1 for UOR, outperforming most current catalysts. Our strategy features high designability in phase engineering, enabling various electrocatalysts to harness the power of unconventional phases.

关键词： Phase Engineering 2D Material Microwave Interface Chemistry Urea Oxidation Reaction

A Novel L‑Cys@Cu MOF Embedding onto Cotton Fiber Surfaces to Exert Excellent Antiviral and Antibacterial Effects

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advanced Fiber materials 2024年第2期6卷 444-457页

作者： Yuanxiang Xiao Jingjing Jiang Rui Cai Jiajia Fu Shuangfei Xiang Shujun Zhao Feiya Fu Hongyan Diao Xiangdong Liu School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory for Diagnosis and Treatment of Infectious Diseases Collaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesCollege of MedicineThe First Affiliated HospitalZhejiang UniversityHangzhou 310003China Zhejiang Provincial Innovation Center of Advanced Textile Technology 700 Yuhui RoadKeqiao DistrictShaoxing 312030China

Unpredictable pandemics are likely to pose a significant global threat in the future,and biologically protective textiles will play critical roles in controlling the spread of pathogens during ***,we present a novel metal–organic framework(MOF)composed of repeating units of a Cu(II)/(L-Cys)_(2)complex formed through coordination bonds between Cu(II)and L-Cys,while being interconnected by ionic bonds involving Cu(II)and the carboxylate group of *** covalently embedding the MOF nanofibers onto cotton fiber surfaces,the resulting fabrics exhibit remarkable virucidal and antibacterial ***,even after 200 friction or 50 laundering cycles,the high antiviral ability to inactivate all phi-×174 within 10 min was maintained,and the bacterial reduction rate against *** and *** remained nearly at 100%.The remarkable virucidal effect of the L-Cys@Cu MOF structure is elucidated through a series ofα-amylase denaturation simulation tests,providing the first experimental demonstration of the antiviral mechanism,whereby MOF nanofibers induce protein denaturation to inactivate ***,cytotoxicity assessments confirm that the fabrics adorned with MOF nanofibers are safe for human *** advantages are promising for the development of protective textiles,highlighting the great potential of nanoscience in combating pandemics.

关键词： Metal–organic framework Antibacterial fabric Antiviral fabric Biologically protective textile L-cysteine

Multifunctional Van Der Waals Heterostructures Enabled by Femtosecond Laser-Controlled Band Alignment Engineering

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SSRN 2023年

作者： Liu, Lei Huo, Jinpeng Zou, Guisheng Xiao, Yu Sun, Tianming Feng, Bin Shen, Daozhi Du, Chengjie Peng, Jin Lin, Luchan Department of Mechanical Engineering State Key Laboratory of Tribology Key Laboratory for Advanced Manufacturing by Materials Processing Technology Ministry of Education of PR China Tsinghua University Beijing100084 China Taiyuan University of Technology Taiyuan030024 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China

Tailoring the band alignment of van der Waals (vdW) heterostructures is essential for regulating the electronic and optoelectronic performance of devices with superior functions. However, current band alignment engineering methods suffer from complexity, inflexibility, and limited tuning range, which restricts further applications. In this study, we demonstrate a novel strategy for tailoring the band alignment of BP/MoS2 heterostructures using femtosecond (fs) laser-controlled band alignment engineering. Although this approach sacrifices the rectification ratio of heterostructures, it dramatically expands the tuning range of the band alignment and improves optoelectronic response by localized doping and healing effect at heterojunctions. We also present a new physical model to describe carrier transport behavior for m-n-p structures and investigate the effect of fs laser irradiation. Finally, two conceptual devices were demonstrated to show the advanced applications by this post-processing technique. In optoelectronic applications, we utilized this strategy to improve photoresponsivity (> 8 times), detectivity (~1.48×1011 Jones), and fill the response gap in the NIR region of photodetectors. In multivalued logic applications, site-specific engineering was used to transform the inverter operating mode from binary to ternary with a wide output swing (~90%) by creating a unique NDT region. Our study demonstrates the potential of fs laser irradiation as a high-spatial-accuracy, air-stable and versatile band alignment engineering method for electronic and optoelectronic applications in the future. © 2023, The Authors. All rights reserved.

关键词： Heterojunctions

Investigation of Process Window of Al-Li Alloy During Twin-Roll Casting

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SSRN 2023年

作者： Yu, Wei Wang, Yin Li, Yong Jiang, Tao Wang, Haiyao Wang, Zhaodong Xu, Guangming Li, Jiadong Tang, Hongxue State Key Laboratory of Rolling and Automation Northeastern University Shenyang110819 China Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang110819 China Guangxi Advanced Aluminum Processing Innovation Center Co. Ltd. Nanning530007 China School of Materials and Metallurgy University of Science and Technology Liaoning Anshan114051 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures

The relationship between rheological behavior and segregation mechanism in twin-roll casting (TRC) processes has been discussed separately and qualitatively for many years, but there remains a lack of systematic and comprehensive analysis. Three typical rheological behaviors and structures have been exhibited with increased roll gaps in TRC, defined as TRC-3, 6, and 10, and prepared using 2060 Al-Li alloys in this study. The three typical process ranges were analyzed through the combination of experiments and multiscale simulations, including heat, flow, mechanical, and soluteconditions. Two stress-induced inverse segregation mechanisms were detected, which are semi-solid phase reflux induced by rolling stress, and solidify shell expansion induced by shearing stress. More importantly, a positive correlation model of shear-induced segregation was proposed here. Based on the above segregation behavior, a representative process for low stress-low segregation, TRC-6, was successfully prepared. The strength of TRC-6 with low segregation after T8 treatment reached 562.9 MPa, which were 9.0 and 8.2% higher than those of TRC-3 and 10, respectively. Futher, it provided a basis for the new generation of TRC process design with nonsegregation defects for the green, short process, and efficient preparation of Al-Li alloys. © 2023, The Authors. All rights reserved.

关键词： Binary alloys