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Bridging from the Sequence to Architecture: Graft Copolymers engineering via Successive Latent Monomer and Grafting-from Strategies

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Chinese Journal of Chemistry 2021年第5期39卷 1273-1280页

作者： Yajie Zhang Xiaohuan Cao Yang Gao Yujie Xie Zhihao Huang Zhengbiao Zhang Xiulin Zhu State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China State Key Laboratory of Radiation Medicine and Protection Soochow UniversitySuzhouJiangsu 215123China Global Institute bf Software Technology No.5 Qingshan RoadSuzhou National Hi-Tech DistrictSuzhouJiangsu 215163China

The on-demand building copolymer structures,from sequence to architecture,is crucial in understanding the relation between pol-ymer structure and property,meanwhile motivating the innovation of polymer ***,the challenge is conspicuous for,complicated polymer structures from inherently intricate *** this work,copolymers with tailored grafting density and distributions were achieved using successive latent monomer and grafting-from *** hydroxyl group functionalized fu-ran/maleimide adduct(FMOH)was selected as the latent monomer for RAFT polymerization of an array of copolymers with tailored localization of hydroxyl group along the main *** hydroxyI group further initiated the ring opening polymerization(ROP)of L-lactide or ε-caprolactone,resulting in a library of multicomponent copolymers via grafting-from *** initiating efficiency reached to-100% with variable molecular weight(21300-58600 Da)and narrow distributions(Ð_(M)<1.25),indicating that such graft copolymers possessed controlled density and distribution of side chains as its linear *** investigation on thermal properties of the well-defined graft copolymers implied that the precise tailoring over copolymer structures at the molecule level could lead to tunable chemical/physical *** work bridged polymer from sequence to architecture,unveiled a new meth-od in creating graft copolymers with programmable structures and provided the insight into the structure/property relationship.

关键词： Sequence determination Polymers Latent Monomer Polymerization Maleimide

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Multiphysics Modeling and Parameter Analysis of Industrial Power-to-Hydrogen Electrolyzers

Multiphysics Modeling and Parameter Analysis of Industrial P...

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Energy, Electrical and Power engineering (CEEPE), International Conference on

作者： Ke Chen Kewei Hu Jie Yang Feng Chen Zhiyao Zhong Jiakun Fang State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This paper proposes the multiphysics model of the industrial power-to-hydrogen electrolyzers. Based on the multi-energy flow in the industrial power-to-hydrogen electrolysis plant, the coupling among the multiphysics in the electrolyzer, including the electrochemical reaction, the flow field, the mass transfer and the temperature field, are unveiled. The governing equations and coupling mechanisms of the physical fields are introduced in detail, which are further illustrated according to the simulation results in COMSOL Multiphysics. Furthermore, several critical parameters, including the cell voltage, temperature and the concentration of the electrolyte, are analyzed based on the proposed model. Through the analysis on the current density- voltage characteristics, it can be concluded that the operating of the industrial electrolyzer usually faces the trade-off between the hydrogen production rate and the efficiency. The proposed model provides multiphysics explanations on the industrial statistics of the electrolyzer.

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Superior Iodine Uptake Capacity Enabled by an Open Metal-Sulfide Framework Composed of Three Types of Active Sites

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CCS Chemistry 2023年第7期5卷 1540-1548页

作者： Yugang Zhang Linwei He Tingting Pan Jian Xie Fuqi Wu Xinglong Dong Xia Wang Lixi Chen Shicheng Gong Wei Liu Litao Kang Junchang Chen Lanhua Chen Long Chen Yu Han Shuao Wang State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123 Advanced Membranes and Porous Materials(AMPM)Center Physical Sciences and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900 School of Life Sciences School of Civil EngineeringShaoxing UniversityShaoxing 312000 School of Environmental and Materials Engineering Yantai UniversityYantai 264005

Efficient adsorption of gaseous radioiodine is pivotal for the sustainable development of nuclear energy and the long-termradiation safety of the ecological ***,state-of-the-art adsorbents(***-organic frameworks and covalent-organic frameworks)currently under exploration suffer severely from limited adsorption capacity,especially under a real-world scenariowith extremely lowradioiodine concentration and elevated *** mostly originates from the relatively weak sorption driving forces mainly determinedby the iodine-adsorbent interaction consistingof noncovalent interactionswith a small fraction of strong chemical ***,we document the discovery of an open metal-sulfide framework((NH_(4))_(2)(Sn_(3)S_(7)),donated as SCU-SnS)constructed by three different types of active sites as a superior iodine *** from the ability of iodine for pre-enrichment into the framework by charge-balancing NH_(4)^(+)through N-H···I interaction,the efficient reduction of I^(2)affording I^(-)by S^(2-),and extremely high binding affinity between Sn_(4)^(+)and I^(-),SCU-SnS exhibit a record-breaking iodine adsorption capacity(2.12 g/g)under dynamic breakthrough conditions and the highest static capacity(6.12 g/g)among all reported inorganic adsorbents,both at 348 *** facile synthesis and low cost endow SCU-SnS with powerful application potential for the nuclear industry.

关键词： iodine metal-sulfide framework removal active sites dynamic adsorptio

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White matter regeneration induced by aligned fibrin nanofiber hydrogel contributes to motor functional recovery in canine T12 spinal cord injury

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Regenerative Biomaterials 2022年第1期9卷 260-270页

作者： Zheng Cao Weitao Man Yuhui Xiong Yi Guo Shuhui Yang Dongkang Liu He Zhao Yongdong Yang Shenglian Yao Chuzhong Li Lingyun Zhao Xiaodan Sun Hua Guo Guihuai Wang Xiumei Wang State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced MaterialsSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Neurosurgery Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 102218China Center for Biomedical Imaging Research Tsinghua UniversityBeijing 100084China Department of Orthopedics Dongzhimen HospitalBeijing 100007China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Neurosurgical Institute Beijing Tiantan HospitalBeijing 100070China

A hierarchically aligned fibrin hydrogel(AFG)that possesses soft stiffness and aligned nanofiber structure has been successfully proven to facilitate neuroregeneration in vitro and in ***,its potential in promoting nerve regeneration in large animal models that is critical for clinical translation has not been sufficiently ***,the effects of AFG on directing neuroregeneration in canine hemisected T12 spinal cord injuries were *** obvious white matter regeneration consisting of a large area of consecutive,compact and aligned nerve fibers is induced by AFG,leading to a significant motor functional *** canines with AFG implantation start to stand well with their defective legs from 3 to 4 weeks postoperatively and even effortlessly climb the steps from 7 to 8 ***,high-resolution multi-shot diffusion tensor imaging illustrates the spatiotemporal dynamics of nerve regeneration rapidly crossing the lesion within 4 weeks in the AFG *** findings indicate that AFG could be a potential therapeutic vehicle for spinal cord injury by inducing rapid white matter regeneration and restoring locomotion,pointing out its promising prospect in clinic practice.

关键词： aligned fibrin hydrogel spinal cord injury white matter regeneration diffusion tensor imaging canine

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Synthesis and Performance Characterization of a Low Adsorption Clay-resistant Polycarboxylate Superplasticizer

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Journal of Wuhan University of technology(Materials Science) 2021年第3期36卷 446-455页

作者： ZHANG Ying WANG Pengshuo SUN Guowen YANG Jianming GAO Rui School of Materials Science and Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China College of Civil Engineer-ing Yancheng Institute of TechnologyYancheng 224051China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang050043China Heibei Key Laboratory of Advanced Materials for Transportation Engineering and Environment Shijiazhuang Tiedao UniversityShijiazhuang050043China

A low adsorption clay-resistant polycarboxylate superplasticizer(KN-PC)was synthesized using acrylic acid and isopentenol polyoxyethylene ether as the main reaction *** structural characterization and clay-resistant mechanism of the KN-PC were explored using Fourier transform infrared spectroscopy and X-ray diffraction,and the effect of the KN-PC on the performance of composite paste with various montmorillonite(MMT)contents was *** with ordinary polycarboxylate superplasticizer(PC),the KN-PC has a low sensitivity to the *** the action of the MMT,the adsorption dosage of the KN-PC on the MMT is much smaller than that of the PC.

关键词： polycarboxylate superplasticizer clay-resistant montmorillonite performance synthesis

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Research on Cracking Mechanism of Aero-Engine Thermocouple Bearing Ring Under High-Temperature Creep Test

SSRN

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SSRN 2024年

作者： Wang, Songjun He, Jianjun Gong, Zhihui Cai, Yuhui Yao, Biqing Xiao, Tingyi School of Energy and Power Engineering Changsha University of Science and Technology Changsha410114 China State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha40082 China

AbstractsThe thermocouple bearing ring in aero-engine have prematurely cracked during service, posing a significant safety hazard. This paper analyzes the microstructure and fracture behavior of K4169 high-temperature superalloy specimens under thermomechanical loading considering this phenomenon. The results revealed that a small amount of needle-like δ-phases and an increased number of Laves phases accumulated around the grain boundaries after direct aging treatment. After solution treatment followed by aging, more twinning features were observed at the grain boundaries, and the Laves phase was diffusely distributed. No needle-like δ-phases were found at 710°C, indicating that the heat treatment was optimal. At 650°C, the alloy demonstrated excellent creep resistance, characterized by distinct stages of constant velocity and accelerated creep. On the specimen's surface, twins and a few dislocations appeared, while the Laves phase precipitated and partially aggregated at the grain boundaries, accompanied by the formation of small voids. As the temperature increases, the Laves phase content increases along with the formation of voids. These Laves phases were accompanied by needle-like δ phases, forming 'bands' that facilitated crack initiation, primarily along the grain boundaries. At 650°C, secondary cracks appeared at the fracture, indicative of predominantly ductile fracture behavior. With an increase in temperature to 710°C, precipitation of the second phase increased significantly, leading to pronounced stress concentration. Consequently, the fracture mode transitioned from ductile fracture to a ductile-brittle mixed fracture. © 2024, The Authors. All rights reserved.

关键词： Grain boundaries

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Efficient chromium Cr (VI) removal from wastewater through modified cycad's leaf biochar: insights into adsorption-reduction mechanisms and kinetic analysis

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Biomass and Bioenergy 2025年 200卷

作者： Li, Xin Wu, Qirui Chen, Dingdu Tamjidur, Rahman Sheikh Fan, Peng Wang, Geming Zhang, Weixin Provincial Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of Technology Wuhan430073 China The State Key Laboratory of Materials Processing and Die & Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Wuhan NARI Limited Liability Company State Grid Electric Power Research Institute Wuhan430074 China

The removal of Cr(VI) from wastewater through adsorption is beneficial for both human health and the environment. Current adsorption materials often suffer from a small specific surface area and a single pore structure. In this study, cycad leaves were carbonized via vacuum high-temperature calcination and subsequently activated with KOH to obtain modified cycad leaf biochar (KBC). The activation with KOH significantly improved the specific surface area and pore structure of the biochar. The KBC sample exhibited abundant microporous and mesoporous structures, which facilitated the conversion of C=O to C-O, generating more active sites conducive to Cr(VI) adsorption. The specific surface area of KBC reached as high as 1225 m2/g, which was 40 times greater than that of BC (30 m2/g). These microstructural features significantly enhanced the adsorption capacity of cycad leaf biochar for Cr(VI), increasing it from 39.1 mg/g for BC to 250.7 mg/g for KBC when the adsorption time reached 96 h. Furthermore, both the pseudo-first-order kinetic model and the pseudo-second-order kinetic model were employed to deeply investigate the adsorption mechanism, which encompasses physical adsorption, chemical adsorption, and redox reactions. Kinetic analysis was conducted to elucidate the adsorption process. Additionally, density functional theory calculations were performed to verify the reaction mechanism between C-O groups and Cr(VI). By leveraging the synergistic effects of vacuum high-temperature calcination and KOH activation, the specific surface area and pore structure of the biochar achieved a significant improvement. This study not only provides a new method for wastewater treatment but also offers theoretical insights and technical support for the practical application of biochar-based adsorption materials in environmental remediation. © 2025 Elsevier Ltd

关键词： Potassium hydroxide

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All-Polymeric Fibrous Triboelectric Nanogenerator for Self-Powered Intelligent Active Motions Monitoring System

SSRN

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SSRN 2023年

作者： Wu, Yuxuan Cui, Xiuju Wu, Hanguang Su, Zhiqiang State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical Technology Beijing100029 China Beijing Key Laboratory of Clothing Materials R & D and Assessment Beijing Institute of Fashion Technology Beijing100029 China

The emergence of fibrous triboelectric nanogenerators (FTENGs) provides a promising candidate for self-powered wearable electronics, and developing the all-polymeric FTENGs is beneficial to further improve the wearing comfort of the devices. However, it remains a crucial challenge to fabricate the all-polymeric FTENGs with ideal energy output performances. In this work, an all-polymeric stretchable FTENG (PEDOT/FSiR-FTENG) with high triboelectric outputs is fabricated through a simple rolling method and applied in the human active motions monitoring. The wrinkled PEDOT:PSS electrode layer is constructed to endow the PEDOT/FSiR-FTENG with high stretchability, enabling it to stably output electrical signals under 50% strain extension. In addition, the configuration and constituent of the electrode are adjusted to further enhance its conductivity, thereby significantly optimizing the triboelectric performance of the PEDOT/FSiR-FTENG. The obtained PEDOT/FSiR-FTENG can output the open-circuit voltage and short-circuit current of 30 V and 0.16 μA respectively under the external force of 60 N, and the electric signals show an obvious variation with the change of the force between 0.5-220 N, demonstrating its high sensitivity and responsiveness to mechanical stimuli. Taking advantage of these outstanding properties, the PEDOT/FSiR-FTENG is applied as a flexible self-powered sensor in the precise physiological detection, including large human motions (steps and joints bending) and slight human vital signs (expression, pulse, and phonation). In addition, a self-powered intelligent active motion monitoring system with wireless data transmission ability is developed based on the PEDOT/FSiR-FTENG, presenting great application potential in the remote patient care and the real-time communication between deaf-mutes. © 2023, The Authors. All rights reserved.

关键词： Nanogenerators

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Siox@Zro2@C Nanospheres as High-Capacity and Stable Anode Material for Lithium-Ion Batteries

SSRN

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SSRN 2023年

作者： Deng, Wenwen Ni, Shaocong Hu, Naiqi Zhou, Ying Jin, Zhong State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and Technology Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing210023 China School of Material Science and Engineering Suzhou University of Science and Technology Suzhou215009 China

Silicon oxide (SiOx) has been widely studied due to its ultrahigh theoretical specific capacity for lithium storage. However, its inherent low electronic conductivity and large volume change before and after lithium insertion have limited its commercialization. To address this issue, we report the synthesis of SiOx@ZrO2@C ternary composite nanospheres by convenient and scalable wet chemistry and sintering processes. In the unique structure of 3D porous SiOx@ZrO2@C nanospheres, ZrO2 supplies high structural stability and high electronic conductivity, while the amorphous carbon layer helps to form a stable solid electrolyte interface, suppress volume expansion and greatly improve the conductivity. Electrochemical measurements demonstrate that the SiOx@ZrO2@C nanospheres exhibit a capacity retention of 72.2% after 500 cycles at 500 mA g-1. At a high current density of 800 mA g-1, the SiOx@ZrO2@C nanospheres can still deliver a capacity of 529.1 mAh g-1. This work provides a promising mass-scale synthesis method for producing SiOx composites and introduces a novel and high-performance anode material for lithium-ion batteries. © 2023, The Authors. All rights reserved.

关键词： Anodes

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Location of the space stem in long negative laboratory sparks

Location of the space stem in long negative laboratory spark...

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Asia-Pacific International Conference on Lightning (APL)

作者： Xiangen Zhao Yaping Du Lili Guo Yang Liu Junjia He Department of Building Environment and Energy Engineering The Hong Kong Polytechnic University Hong Kong China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

It is well known that the negative leader in the air develops in a stepwise manner, with each step originating from a space stem. However, the formation mechanism of a space stem remains unknown, leading to a blockage in the study on negative leader discharge. One of the main reasons is the lack of observations of space stems. For this reason, and as a continuation of our work, this paper focuses on the initiation location of the space stems. We have designed experimental conditions to enable space stem observation using a high-speed camera. Through processing the experimental images, it is found that the location where the space stems start to be formed may be located at the boundary of the previous corona streamer discharge, or inside the pre-corona streamer region, but at the edge of the intense discharge area. These findings may help to further Figure out the formation mechanism of a space stem in long negative sparks in the air.

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