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KH550-SiO_(2)/polyimide insulating paper preparation and characterisation

High Voltage 2024年第2期9卷 466-473页

作者： Minghe Chi Xue Sun Xiaorui Zhang Jiahao Shi Ling Weng Yang Yu School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbinChina Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbinChina School of Materials Science and Engineering Harbin University of Science and TechnologyHarbinChina

Oil-paper insulation material is an essential component for oil-filled transformers,and polyimide(PI)insulation paper is a novel material in the field of *** improvement of insulation class for insulation paper has gained significant attention in recent *** this study,SiO_(2)nanoparticles were modified with a silane coupling agent(KH550),and the KH550-SiO_(2)was added to the fibre membrane through in situ *** chemical composition and microcosmic characteristics of the PI porous fibre membrane were characterised using FT-IR and SEM FT-IR and ***-quently,the dielectric constant of the composite paper was reduced to 2.3 upon adding 3 wt%of KH550-SiO_(2),and the dielectric strength reached its maximum value of 85 kV/*** results demonstrate that the insulation performance of the KH550-SiO_(2)/PI composite was significantly improved due to the incorporation of nano-SiO_(2).This establishes an efficient approach for achieving excellent electrical and thermal properties in practical applications using the KH550-SiO_(2)/PI fibre membrane.

关键词： composite insulation fibre

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Acceptor-Type Singlet Fission Material Based on Strong Absorption Tetracyanothienoquinoid Skeleton

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CCS Chemistry 2024年第9期6卷 2142-2149页

作者： Senhao Wang Xiang-Yang Liu Mengfan Zhang Long Wang Ganglong Cui Hongbing Fu Jiannian Yao Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024 College of Chemistry and Material Science Sichuan Normal UniversityChengdu 610068 Key Laboratory of Theoretical and Computational Photochemistry Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875 Beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal UniversityBeijing 100048 Beijing National Laboratory for Molecules Science(BNLMS) Key Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of SciencesBeijing 100190

The practical efficiency of singlet fission(SF)-based photovoltaic devices is still far from satisfactory due to the limited scope of SF materials suitable for device application and the scarcity of schemes available for triplet *** SF materials identi-fied to date are typically electron donors while acceptor-type SF materials remain largely ***,the combination of a conventional electron donor and SF-active electron acceptor could circumvent the competitive energy transfer channel and better play the unique advantages of the SF process,which might be an adequate alternative for practical *** this work,we presented a new acceptor-type SF material based on a tetracyanothienoquinoid *** a quinoid skeleton exhibited strong absorption,ultrafast SF process,and excellent *** transient spectroscopy and multireference calculations(XDWCASPT2),the SF dynamics were examined featuring the rapid generation and subsequent annihilation and/or partial dissociation of multiexciton ***,our results not only provide a robust acceptor-type SF material but also suggest an adequate donor–acceptor alternative for SF-based solar cells,which could pave the way for the practical application of such a potential process.

关键词： singlet fission acceptor quinoidal skeleton mutiexciton state multireference calculation transient spectroscopy

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Precursor-Mediated Direct Growth of Defect-Rich Hierarchical Nanocarbons for Electrocatalytic Hydrogen Peroxide Production

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Chinese Journal of Chemistry 2024年第23期42卷 3113-3121页

作者： Xiaoting Sun Tiantian Lu Jialei Chen Youzeng Li Shan Chen Xuelong Liao Ying Liu Runyu Lv Huan Wang Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(RECAST)Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)College of ChemistryNankai UniversityTianjin 300071China

Carbon-based nanomaterials show great potential in selective electrochemical oxygen reduction reaction(ORR)through two-electron(2e^(-))pathway for H_(2)O_(2)production,which provides an eco-friendly alternative to industrial energy-intensive anthraquinone ***,it still remains challenging to directly construct topological defects,which makes it difficult to study the working mechanism on 2e^(–)***,we propose a precursor-mediated chemical vapor deposition(CVD)approach for direct growth of topological defect-rich hierarchical *** acid(H_(3)BO_(3))is introduced into the precursor for disturbing the nucleation and growth through decomposing B-containing species,which can in situ induce the formation of pentagon *** topological defect is found to be capable of introducing lattice strain,which can modify the electronic structure of nanocarbons and promote the key intermediate(^(*)OOH)formation,thus greatly enhancing the 2e^(-)ORR ***,the 2e^(-)ORR selectivity shows a positive correlation to the topological defect density,where the average H_(2)O_(2)selectivity reaches above 90%over a wide potential range with optimized concentration of H3BO3 as ***,in a flow cell,the hierarchical nanocarbons achieve a high H_(2)O_(2)production rate of 998 mmol·gcatalyst^(−1)·h^(−1)over 20 h of continuous electrocatalysis with stable current density(>100 mA·cm^(–2))and Faradaic efficiency(>90%).This work provides a straightforward method for the synthesis of active metal-free carbon-based catalyst for sustainable H_(2)O_(2)production.

关键词： Two electron oxygen reduction Topological defects In situ growth Precursor-mediated H_(2)O_(2)selectivity

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Twisted Integration of Complex Oxide Magnetoelectric Heterostructures via Water‑Etching and Transfer Process

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Nano-Micro Letters 2024年第1期16卷 360-369页

作者： Guannan Yang Guohua Dong Butong Zhang Xu Xu Yanan Zhao Zhongqiang Hu Ming Liu State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research LaboratoryKey Laboratory of the Ministry of EducationEngineering Research Center of Spin Quantum Sensor ChipsUniversities of Shaanxi ProvinceSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Manipulating strain mode and degree that can be applied to epitaxial complex oxide thin films have been a cornerstone of strain *** recent years,lift-off and transfer technology of the epitaxial oxide thin films have been developed that enabled the integration of heterostructures without the limitation of material types and crystal ***,twisted integration would provide a more interesting strategy in artificial magnetoelectric heterostructures.A specific twist angle between the ferroelectric and ferromagnetic oxide layers corresponds to the distinct strain regulation modes in the magnetoelectric coupling process,which could provide some insight in to the physical *** this work,the La_(0.67)Sr_(0.33)MnO_(3)(001)/0.7Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.3PbTiO_(3)(011)(LSMO/PMN-PT)heterostructures with *** *** angles were assembled via water-etching and transfer *** transferred LSMO films exhibit a fourfold magnetic anisotropy with easy axis along LSMO<110>.A coexistence of uniaxial and fourfold magnetic anisotropy with LSMO[110]easy axis is observed for the 45°Sample by applying a 7.2 kV cm^(−1)electrical field,significantly different from a uniaxial anisotropy with LSMO[100]easy axis for the 0°*** fitting of the ferromagnetic resonance field reveals that the strain coupling generated by the 45°twist angle causes different lattice distortion of LSMO,thereby enhancing both the fourfold and uniaxial *** work confirms the twisting degrees of freedom for magnetoelectric coupling and opens opportunities for fabricating artificial magnetoelectric heterostructures.

关键词： Magnetoelectric heterostructures Twist angle Epitaxial lift-off Magnetic anisotropy Ferromagnetic resonance

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Strength-ductility synergy in a hierarchical Cu-Cr-Zr alloy processed via laser powder bed fusion

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Journal of materials science & Technology 2024年第24期191卷 122-133页

作者： Wenjun Ma Fei Cao Lei Gao Yihui Jiang Zheng Chen Hao Shi Yanfang Wang Shuhua Liang School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Engineering Research Center of Conducting Materials and Composite Technology Ministry of EducationXi’an 710048China Shaanxi Province Key Laboratory of Electrical Materials and Infiltration Technology Xi’an 710048China

Laser powder bed fusion(LPBF)is a promising method for manufacturing functional and structural integrated Cu-Cr-Zr ***,the LPBF-processed Cu-Cr-Zr alloys still suffer from the strength-ductility trade-offdilemma,while maintaining high ***,LPBF-processed Cu-Cr-Zr alloy with a hierarchical structure was obtained by increasing the Cr and Zr content *** aging treatment,the hierarchical structure was composed of melt tracks at the macroscale,coarse grains(31.9±0.1μm)and fine grains(5.6±0.2μm)at the microscale,high-density of dislocations and dual precipitates at the *** direct aged sample exhibited an excellent combination of strength and ductility(tensile strength was enhanced to 626±1 MPa and uniform elongation of 16.2%±1.1%),which is superior to the traditionally wrought and LPBF-processed Cu-Cr-Zr alloys reported ***,a good electrical conductivity of 71.1%±0.3%IACS was also *** addition,the heterogeneous deformation-induced stress caused by the hierarchical structure not only led to a large increase in yield strength but also promoted tensile ductility.

关键词： Additive manufacturing Cu-Cr-Zr alloy Laser powder bed fusion Hierarchical structure Strength-ductility synergy

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Azocalixarenes: a scaffold of universal excipients with high efficiency

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science China Chemistry 2024年第5期67卷 1697-1706页

作者： Yu-Xin Yue Yi-Lin Lin Meng-Meng Chen Han-Wen Tian Rong Ma Ze-Han Wang Fang-Yuan Chen Yu-Chen Pan Dong-Sheng Guo College of Chemistry State Key Laboratory of Elemento-Organic ChemistryKey Laboratory of Functional Polymer Materials(Ministry of Education)Frontiers Science Center for New Organic MatterCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Nankai UniversityTianjin 300071China

Excipients are important components of pharmaceutical preparations that affect their quality, safety, and efficacy. Macrocyclic receptors are a family of supramolecular excipients with several advantages, including molecular-level protection, small sizes,fast kinetics of host-guest recognition, and modular construction. With the continuous advances in the medical field, personalized and precision medicine requires the development of excipients with low dosages, integrated modifying effects, universality,and controlled release. To meet these requirements, we have developed a new family of macrocyclic excipients based on calixarenes by integrating their covalent(broad chemical design space) and noncovalent(wide range of substrates) ***, azocalixarenes(Azo CAs) were designed, showing high binding affinities to a broad spectrum of active pharmaceutical ingredients(APIs), selectivity to interferents, and responsiveness to hypoxic microenvironments. Due to their highly efficient and controllable recognition, Azo CAs serve as low-dose excipients for 30 APIs. Molecular encapsulation by Azo CAs results in the integrated modification of the physicochemical properties of APIs, including solubility, stability, bioavailability,and biocompatibility. Moreover, Azo CAs can be reduced by azoreductases overexpressed in hypoxic microenvironments,leading to the controlled release of APIs. Collectively, Azo CA excipients have broad application prospects for a series of diseases such as enteritis, arthritis, stroke, cancer, bacterial infection and kidney injury, with diverse therapeutic modalities,including chemotherapy, photodynamic therapy, photothermal therapy, immunotherapy, boron neutron capture therapy, radiotherapy, fluorescence imaging, and their combinations.

关键词： supramolecular chemistry host-guest systems excipient calixarene molecular recognition

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MXene-induced electronic structure modulation of Fe-Al-LDH to boost the Fenton-like Reaction:Singlet oxygen evolution and electron-transfer mechanisms

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Journal of materials science & Technology 2025年第1期204卷 224-237页

作者： Zhongzhu Yang Zeyan Zhou Xiaofei Tan Guangming Zeng Chang Zhang College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Key Laboratory of Environmental Biology and Pollution Control(Hunan University) Ministry of EducationChangsha 410082China School of Materials Science and Engineering Hunan UniversityChangsha 410082China

Layered double hydroxide(LDH)based heterogonous peroxymonosulfate(PMS)activation degradation of pollutants has attracted extensive *** challenge is to selectively regulate the traditional free radical dominant degradation pathway into a nonradical degradation ***,an interface ar-chitecture of Ti_(3) C_(2) T_(x)-MXene(MXene)loading on the Fe-Al LDH scaffold was developed,which showed excellent stability and robust resistance against harsh ***,the rate constant for tetra-cycline hydrochloride(TC)degradation in the MXene-LDH/PMS process was 0.421 min^(-1),which was ten times faster than the rate constant for pure Fe-Al LDH(0.042 min^(-1)).Specifically,more reactive Fe with the closer d-band center to the Fermi level results in higher electron transfer *** occupa-tions of Fe-3d orbitals in Mxene/Fe-Al LDH are pushed above the Fermi level to generate,which results in higher PMS adsorption and inhibition of the release of oxygen-containing active species intermedi-ates,leading to the enhanced^(1)O_(2) ***,the built-in electric field in the heterojunc-tion was driven by the charge redistribution between MXene and Fe-Al LDH,resulting in a mediated-electron transfer mechanism,differentiating it from the Fe-Al LDH/PMS *** was fascinating that MXene/Fe-Al LDH achieved satisfactory treatment efficiency in continuous column reactor and real landfill leachate.

关键词： interface engineering Density functional theory Layered double hydroxides Peroxymonosulfate Electron transfer

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Insight into the metal-free electrocatalysis of heteroatom-doped carbon nanocages in competitive CO_(2) reduction and H_(2) evolution

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Nano Research 2025年第2期18卷 255-262页

作者： Liu Jiao Chenghui Mao Biao Feng Fengfei Xu Shuo Li Jun Zhong Mingqi Xia Ruonan Cui Xizhang Wang Lijun Yang Qiang Wu Zheng Hu Key Laboratory of Mesoscopic Chemistry of Ministry of Education(MOE)and Jiangsu Provincial Laboratory for Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Institute of Functional Nano and Soft Materials Laboratory(FUNSOM) Jiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123China

Metal-free carbon-based catalysts exhibit diverse electrocatalytic performances in CO_(2) reduction reaction(CO_(2)RR),but the attributions and contributions of active sites are still confusing to ***,the hierarchical carbon nanocages(hCNC)doped with different heteroatoms(B,N,P,S)are prepared to examine the impact of dopants on the competitive CO_(2)RR and hydrogen evolution reaction(HER).The hCNC and P-doped hCNC show little CO_(2)RR activity,B-and S-doped hCNC show weak CO_(2)RR activity,while N-doped hCNC presents high CO_(2)RR *** CO Faradaic efficiency(FECO)of N-containing hCNC increases almost linearly with increasing the N content,even with the co-existing B or P.S and SN-doped hCNC more facilitate the HER.16 doping configurations are constructed,and up to 53 sites are examined CO_(2) H2O H2 CO*H*COOH*CO for the electrochemical activities with a constant potential modelling *** pyridinic-N(N^(*))is the best active site for CO_(2)RR to CO,while CBO_(2)H_(2)-1(αC^(*)),CBO_(2)H_(2)-2(γC^(*)),NO-1(βC^(*)),PO_(2)H-3(αC^(*))and SO_(3)H-3(δC^(*))are active for *** optimized FECO achieves 83.6%for N-doped hCNC with 9.54 at.%nitrogen,and S-doped hCNC reaches ca.30 mA·cm^(-2) current density for *** study unveils the structure-performance correlation of heteroatom-doped hCNC,which is conducive to the rational design of advanced metal-free carbon-based catalysts.

关键词： heteroatom-doping metal-free carbon-based catalyst CO_(2)reduction reaction hydrogen evolution reaction active sites density functional theory(DFT)

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The chemical environment and structural ordering in liquid Mg-Y-Zn system:An ab-initio molecular dynamics investigation of melt for the formation mechanism of LPSO structure

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Journal of Magnesium and Alloys 2024年第2期12卷 815-824页

作者： Tangpeng Ma Jin Wang Kaiming Cheng Chengwei Zhan Jixue Zhou Jingyu Qin Guochen Zhao Xinfang Zhang Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

In an effort to clarify the formation mechanism of LPSO structure in Mg-Y-Zn alloy,the chemical environment and structural ordering in liquid Mg-rich Mg-Y-Zn system are investigated with the aid of ab-initio molecular dynamics *** liquid Mg-rich Mg-Y alloys,the strong Mg-Y interaction is determined,which promotes the formation of fivefold symmetric local *** Mg-Zn alloys,the weak Mg-Zn interaction results in the fivefold symmetry weakening in the liquid *** to the coexistence of Y and Zn,the strong attractive interaction is introduced in liquid Mg-Y-Zn ternary alloy,and contributes to the clustering of Mg,Y,Zn launched from *** is more,the distribution of local structures becomes closer to that in pure Mg compared with that in binary Mg-Y and Mg-Zn *** results should relate to the origins of the Y/Zn segregation zone and close-packed stacking mode in LPSO structure,which provides a new insight into the formation mechanism of LPSO structure at atomic level.

关键词： Mg-Y-Zn Chemical environment Structural ordering ab-initio molecular dynamics

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Insight the long-term biodegradable Mg-RE-Sr alloy for orthopaedics implant via friction stir processing

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Bioactive materials 2024年第11期41卷 293-311页

作者： Yixing Zhu Mengran Zhou Weikang Zhao Yingxin Geng Yujie Chen Han Tian Yifan Zhou Gaoqiang Chen Ruizhi Wu Yufeng Zheng Qingyu Shi State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084PR China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing100084PR China Department of Orthopedics The First Affiliated Hospital of Chongqing Medical UniversityChongqing400016PR China Key Laboratory of Superlight Materials&Surface Technology(Ministry of Education) Harbin Engineering UniversityHarbin150001PR China School of Materials Science and Engineering Peking UniversityBeijing100871PR China

Magnesium alloys,noted for their substantial mechanical strength and exceptional biocompatibility,are increasingly being considered for use in biodegradable ***,their rapid degradation and significant hydrogen release have limited their applications in *** this study,a novel Mg-RE-Sr alloy was created by friction stir processing to modify its microstructure and enhance its degradation *** microstructural characterization,the friction stir processing effectively refined the grains,accelerated the re-dissolution of precipitates,and ensured a uniform distribution of these *** processed alloy demonstrated improved comprehensive properties,with an in vitro corrosion rate of approximately 0.4 mm/y and increases in ultimate tensile strength and elongation by 37%and 166%,***,in vivo experiments involving a rat subcutaneous implantation model revealed a slower degradation rate of 0.09 mm/y and a uniform degradation process,basically achieving the requirements for ideal performance in orthopaedic *** superior degradation characteristics were attributed to the synergistic effect of attenuated galvanic corrosion and the formation of a dense Y(OH)3/Y2O3 film induced by an exceptional microstructure with a highly solid-soluted matrix and uniformly refined ***,the alloys exhibited excellent biocompatibility and did not cause undesirable inflammation or produce toxic degradation *** improvements in biocompatibility and degradation characteristics indicate great promise for the use of this friction stir processed alloy in osteosynthesis systems in the clinical setting.

关键词： Magnesium alloy Friction stir processing Microstructural evolution Biodegradable Biocompatibility

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