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Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency

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Chinese Journal of Polymer Science 2025年第2期43卷 316-327页

作者： Wen Yang Liang Yuan Kai Gong Ruo-Han Zhang Lan Lei Hui Li School of Chemistry and Chemical engineering Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering MaterialsUniversity of JinanJinan250022China School of Materials Science and engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin300350China

It is urgent to develop high-performance polyimide(PI)films that simultaneously exhibit high transparency,exceptional thermal stability,mechanical robustness,and low dielectric to fulfil the requirements of flexible display ***,a series of fluorinated polyimide films(FPIs)were fabricated by the condensation of 5,5′-(perfluoropropane-2,2-diyl)bis(isobenzofuran-1,3-dione)(6FDA)and the fluorinated triphenylmethane diamine monomer(EDA,MEDA and DMEDA)with heat-crosslinkable tetrafluorostyrene side groups,which was incorporated by different numbers of methyl groups pendant in the ortho position of amino ***,the FPI films underwent heating to produce crosslinking FPIs(C-FPIs)through the self-crosslinking of double bonds in the *** transparency,solvent resistance,thermal stability,mechanical robustness and dielectric properties of FPI and C-FPI films can be tuned by the number of methyl groups and crosslinking,which were deeply investigated by virtue of molecular dynamics(MD)simulations and density functional theory(DFT).As a result,all the films exhibited exceptional optically colorless and transparent,with transmittance in the visible region of 450-700 nm exceeding 79.9%,and the cut-off wavelengths(λ_(off))were nearly 350 *** thermal decomposition temperatures at 5% weight loss(T_(d5%))for all samples exceeded 504℃.These films exhibited a wide range of tunable tensile strength(46.5-75.1 MPa).Significantly,they showed exceptional dielectric properties with the dielectric constant of 2.3-2.5 at full frequency(10^(7)-20 Hz).This study not only highlights the relationship between the polymer molecular structure and properties,but offer insights for balancing optical transparency,heat resistance and low dielectric constant in PI films.

关键词： Crosslinkable fluorinated polyimide Methyl group Triphenylmethane Transparency Thermal stability Low dielectric constant

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La-substituted W-type barium-nickel ferrites for tunable and high-performance electromagnetic wave absorption

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International Journal of minerals,Metallurgy and Materials 2025年第3期32卷 645-656页

作者： Long Wang Jiurong Liu Shenghui Xie Yanli Deng Zhou Wang Shanyue Hou Shengying Yue Gang Wang Na Wu Zhihui Zeng key laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Electronic Materials Research laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric ResearchSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Army engineering University of PLA College of Field engineering Nanjing 210007China laboratory for Multiscale Mechanics and Medical Science State Key Laboratory for Strength and Vibration of Mechanical StructuresSchool of AerospaceXi’an Jiaotong UniversityXi’an 710049China Department of Electrical and Computer engineering Beckman Institute for Advanced Science and TechnologyUniversity of Illinois at Urbana-ChampaignUrbana 61801USA School of Chemistry and Chemical engineering Shandong UniversityJinan 250100China

W-type barium-nickel ferrite(BaNi_(2)Fe_(16)O_(27))is a highly promising material for electromagnetic wave(EMW)absorption be-cause of its magnetic loss capability for EMW,low cost,large-scale production potential,high-temperature resistance,and excellent chemical ***,the poor dielectric loss of magnetic ferrites hampers their utilization,hindering enhancement in their EMW-absorption *** efficient strategies that improve the EMW-absorption performance of ferrite is highly desired but re-mains ***,an efficient strategy substituting Ba^(2+)with rare earth La^(3+)in W-type ferrite was proposed for the preparation of novel La-substituted ferrites(Ba_(1-x)LaxNi_(2)Fe_(15.4)O_(27)).The influences of La^(3+)substitution on ferrites’EMW-absorption performance and the dissipative mechanism toward EMW were systematically explored and ***^(3+)efficiently induced lattice defects,enhanced defect-induced polarization,and slightly reduced the ferrites’bandgap,enhancing the dielectric properties of the ***^(3+)also enhanced the ferromagnetic resonance loss and strengthened magnetic *** effects considerably improved the EMW-absorption perform-ance of Ba_(1-x)LaxNi_(2)Fe_(15.4)O_(27)compared with pure W-type *** x=0.2,the best EMW-absorption performance was achieved with a minimum reflection loss of-55.6 dB and effective absorption bandwidth(EAB)of 3.44 GHz.

关键词： electromagnetic wave absorption W-type barium ferrite rare earth dielectric

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Multi-Method Comprehensive Investigation and Evaluation on the Effect of in-situ engineering Disposal of Contaminated mine Water

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Journal of Ocean University of China 2025年第1期24卷 75-84页

作者： DING Guantao LU Jie SHI Xinyu WANG Faming MA Yongyue LIU Yuxiang WEI Shanming WANG Yu GUO Xiujun key laboratory of shandong Provincial for Marine Environment and Geological engineering Ocean University of ChinaQingdao 266100China key laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China 801 Institute of Hydrogeology and engineering Geology Shandong Provincial Bureau of Geology&Mineral ResourcesJinan 250014China shandong engineering Research Center for Environmental Protection and Remediation on Groundwater Jinan 250014China Zhangqiu Branch of Jinan Ecological Environment Bureau Jinan 250200China Solid Waste and Chemicals Management Center Ministry of Ecology and Environment Beijing 100012China

mine water pollution caused by improper discharge of industrial wastewater,waste liquid and waste residue into minedout areas is a new form of pollution occurred in China in recent *** kind of pollution is buried deeply,and it is difficult to control,dispose and *** contaminated mine water from abandoned mining areas may even enter the ocean,posing a great threat to marine *** this study,using a water pollution incident occurred in a coal field at a depth of 80 m in shandong province,China,in 2015,as an example,the methods of engineering block disposal and groundwater remediation are reported,and the remediation effects are tested and evaluated by in-situ chemical detection and geophysical *** test results showed that engineering blocking measures such as cut-off walls can obviously block the DNAPL diffusion process in mine water,but the blocking effect on organic pollutants dissolved in water was *** can slow down the diffusion process of organic *** presence of mining tunnels and mined-out areas in the contaminated zone enhances the diffusion speed of various pollutants,especially during the remediation process when pollutants rapidly spread throughout the entire contaminated *** circulation extraction and oxidation methods have a significant degradation effect on pollutants like dichloromethane,but they may generate a large amount of secondary gaseous *** gaseous pollutants may migrate to the shallow subsurface through structures such as faults,leading to secondary subsurface *** designing remediation plans,it is crucial to strike a balance between blocking and guiding in the context of both blocking and restoration projects for achieving effective remediation.

关键词： deep stratum goaf organic pollution of groundwater engineering disposal effect evaluation

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Anti-Swelling Polyelectrolyte Hydrogel with Submillimeter Lateral Confinement for Osmotic Energy Conversion

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Nano-Micro Letters 2025年第4期17卷 96-110页

作者： Yongxu Liu Jiangnan Song Zhen Liu Jialin Chen Dejuan Wang Hui Zhi Jiebin Tang Yafang Zhang Ningbo Li Weijia Zhou Meng An Hong Liu Guobin Xue Institute for Advanced Interdisciplinary Research(iAIR) School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022People’s Republic of China College of mechanical and Electrical engineering Shaanxi University of Science and TechnologyXi’an 710021People’s Republic of China School of Physics and Technology University of JinanJinan 250022People’s Republic of China State key laboratory of Crystal Materials Shandong University27 Shandanan RoadJinan 250100People’s Republic of China

Harvesting the immense and renewable osmotic energy with reverse electrodialysis(RED)technology shows great promise in dealing with the ever-growing energy *** key challenge is to improve the output power density with improved trade-off between membrane permeability and ***,polyelectrolyte hydrogels(channel width,2.2 nm)with inherent high ion conductivity have been demonstrated to enable excellent selective ion transfer when confined in cylindrical anodized aluminum pore with lateral size even up to the submillimeter scale(radius,0.1 mm).The membrane permeability of the anti-swelling hydrogel can also be further increased with cellulose *** real seawater and river water,the output power density of a three-chamber cell on behalf of repeat unit of RED system can reach up to 8.99 W m^(-2)(per unit total membrane area),much better than state-of-the-art *** work provides a new strategy for the preparation of polyelectrolyte hydrogel-based ion-selective membranes,owning broad application prospects in the fields of osmotic energy collection,electrodialysis,flow battery and so on.

关键词： Ionic polymer Hydrogel Confinement effect Anti-swelling Osmotic energy conversion

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Research on active roof control space of fully mechanized caving support based on motion posture perception

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Meitan Xuebao/Journal of the China Coal Society 2025年第1期50卷 645-660页

作者： Zeng, Qingliang Lei, Xiaowan Meng, Zhaosheng Wan, Lirong Ban, Xinliang Hu, Yulong College of mechanical and Electronic engineering Shandong University of Science and Technology Qingdao266590 China College of Energy and Mining engineering Shandong University of Science and Technology Qingdao266590 China State key laboratory of Mining Disaster Prevention and Control Cofounded by shandong province Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China

The fully mechanized top-coal caving support is a critical device that serves both as a support mechanism and an active means for top-coal caving in fully mechanized top-coal caving mining operations. Proactive engagement and reinforcement of the top-coal can effectively guide its intelligent and orderly fragmentation. To investigate the theory of active perturbation and control of the top-coal by the support system, as well as to clarify the dynamic interaction and support space between the fully mechanized top-coal caving support and the top-coal, a dynamic perception method has been proposed. This method aims to enhance the controllability of the top-coal fragmentation and caving process by accurately perceiving the relative spatial postures of various components and the absolute spatial position and orientation of the fully mechanized top-coal caving support. Firstly, utilizing the Denavit-Hartenberg (D-H) method, a mathematical model of the spatial posture of the fully mechanized top-coal caving support is established. Through this analysis, the coordinates of the support's canopy beam and top-coal caving mechanism in both the coordinate systems of each joint node and the body coordinate system are determined, thereby elucidating the relative postures and motion coupling relationships among the key components of the fully mechanized top-coal caving support. Building on this foundation, a global perception model for the fully mechanized top-coal caving working face is constructed, allowing for the derivation of absolute spatial position and orientation data of the support. Additionally, the influence of the dip angles of the working face roof and floor on the spatial support posture of the fully mechanized top-coal caving support is analyzed. Secondly, distribution models for the contact support space of the top beam and the support space of the coal caving mechanism in fully mechanized top-coal caving supports were developed and calculated. This process yielded

关键词： mine roof control

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Adaptive Control of a Flexible Manipulator With Unknown Hysteresis and Intermittent Actuator Faults

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IEEE/CAA Journal of Automatica Sinica 2025年第1期12卷 148-158页

作者： Shouyan Chen Weitian He Zhijia Zhao Yun Feng Zhijie Liu Keum-Shik Hong School of mechanical and Electrical engineering Guangzhou University the School of Control Science and engineering Shandong University IEEE the College of Electrical and Information engineering Hunan University the National engineering Research Center for Robot Visual Perception and Control Technology Hunan University the School of Intelligence Science and Technology University of Science and Technology Beijing (USTB) the Institute for Future the School of AutomationQingdao University the School of mechanical engineering Pusan National University

In this study, we consider a single-link flexible manipulator in the presence of an unknown Bouc-Wen type of hysteresis and intermittent actuator faults. First, an inverse hysteresis dynamics model is introduced, and then the control input is divided into an expected input and an error compensator. Second,a novel adaptive neural network-based control scheme is proposed to cancel the unknown input hysteresis. Subsequently,by modifying the adaptive laws and local control laws, a fault-tolerant control strategy is applied to address uncertain intermittent actuator faults in a flexible manipulator system. Through the direct Lyapunov theory, the proposed scheme allows the state errors to asymptotically converge to a specified interval. Finally,the effectiveness of the proposed scheme is verified through numerical simulations and experiments.

关键词： Adaptive control flexible manipulator intermittent actuator faults inverse hysteresis dynamics vibration control

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Stretchable All-Small-Molecule Organic Solar Cells Enabled by Polymer Elastomer Confinement

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Chinese Journal of Polymer Science 2025年第2期43卷 271-277页

作者： Chen-Yi Zhang Yu-Qiang Liu Hong-Xiang Li Xin-Yue Cui Zheng-Dong Wei Yue-Heng Liu Ming-Hua Li An-Dong Zhang Pei Cheng Zhi-Shan Bo College of Textiles&Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao266071China State key laboratory of Polymer Materials engineering College of Polymer Science and EngineeringSichuan UniversityChengdu610065China College of Materials Science and engineering Qingdao UniversityQingdao266071China Beijing key laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing100875China

Intrinsic stretchability is a promising attribute of polymer organic solar cells(OSCs).However,rigid molecular blocks typically exhibit poor tensile properties,rendering polymers vulnerable to mechanical *** this study,we introduce a different approach utilizing all-small-molecule donors and acceptors to fabricate stretchable *** elastomer,styrene-b-ethylene-butylene-styrene(SEBS),was embedded to modulate film crystallization and *** effectively confines the growth process of donors and acceptors,leading to enhancement of the crystallization quality,thus contributing to enhanced device ***,SEBS can absorb and release mechanical stress during stretching,thereby preventing mechanical degradation of donors and *** mechanical properties of the OSCs were significantly improved by the incorporation of ***,the crack-onset strain increased from 1.03% to 5.99% with SEBS *** findings present a straightforward strategy for achieving stretchable OSCs using all small molecules,offering a different perspective for realizing stretchable devices.

关键词： All-small-molecule Organic solar cells Elastomer Stretchability Flexibility

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Flexible Graphene Field‑Effect Transistors and Their Application in Flexible Biomedical Sensing

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Nano-Micro Letters 2025年第2期17卷 252-313页

作者： Mingyuan Sun Shuai Wang Yanbo Liang Chao Wang Yunhong Zhang Hong Liu Yu Zhang Lin Han Institute of Marine Science and Technology Shandong UniversityQingdao 266237ShandongPeople’s Republic of China State key laboratory of Crystal Materials Shandong UniversityJinan 250100ShandongPeople’s Republic of China School of Integrated Circuits Shandong UniversityJinan 250100ShandongPeople’s Republic of China shandong engineering Research Center of Biomarker and Artificial Intelligence Application Jinan250100ShandongPeople’s Republic of China

Flexible electronics are transforming our lives by making daily activities more *** to this innovation are field-effect transistors(FETs),valued for their efficient signal processing,nanoscale fabrication,low-power consumption,fast response times,and ***,known for its exceptional mechanical properties,high electron mobility,and biocompatibility,is an ideal material for FET channels and *** combination of graphene and FETs has given rise to flexible graphene field-effect transistors(FGFETs),driving significant advances in flexible electronics and sparked a strong interest in flexible biomedical ***,we first provide a brief overview of the basic structure,operating mechanism,and evaluation parameters of FGFETs,and delve into their material selection and patterning *** ability of FGFETs to sense strains and biomolecular charges opens up diverse application *** specifically analyze the latest strategies for integrating FGFETs into wearable and implantable flexible biomedical sensors,focusing on the key aspects of constructing high-quality flexible biomedical ***,we discuss the current challenges and prospects of FGFETs and their applications in biomedical *** review will provide valuable insights and inspiration for ongoing research to improve the quality of FGFETs and broaden their application prospects in flexible biomedical sensing.

关键词： Flexible Graphene Field-effect transistor Wearable Implantable Biosensor

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Discrete Numerical Study on Type II Fracture of Partially Detached Concrete Panels in Cold Region

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Structural Durability & Health Monitoring 2025年第1期19卷 167-191页

作者： Huayi Zhang Maobin Song Lei Shen Nizar Faisal Alkayem Maosen Cao College of Water Conservancy and Hydropower engineering Hohai UniversityNanjing210024China Haihe River Huaihe River and Xiaoqinghe River Basin Water Conservancy Management and Service Center of Shandong ProvinceJinan250100China College of Mechanics and engineering Science Hohai UniversityNanjing211100China

When the upper chord beam of the beam-string structure(BSS)is made of concrete-ﬁlled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on the design of the tensioning plans and selection of control measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of composite BSS during con-struction,the inﬂuence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of concrete,and friction coefﬁcient on the bending stiffness are analyzed parametrically by the numerical simula-tion technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the construction and use stages of the composite BSS,respectively,and the mechanical properties such as prestress-tensioning control value,structural deformation,and internal force of key members are comparatively analyzed when adopting two different construction ***,the optimal construction plan of concrete placementﬁrst and then prestress-tensioning is proposed.

关键词： Beam-string structure(BSS) concrete-ﬁlled steel tube(CFST) bending stiffness timing of concrete placement prestress-tensioning

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Fabrication of porous Zn_(2)TiO_(4)-ZnO microtubes and analysis of their acetone gas sensing properties

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Rare Metals 2021年第6期40卷 1528-1535页

作者： Xiao-Yan Chen Xin-Zhen Wang Feng-Jun Liu Guo-Song Zhang Xiao-Jie Song Jian Tian Hong-Zhi Cui School of Materials Science and engineering Shandong University of Science and TechnologyQingdao 266590China shandong province key laboratory of mine mechanical engineering Shandong University of Science and TechnologyQingdao 266590China

Porous Zn2 Ti04-ZnO microtubes have been successfully fabricated using chemical precipitation followed by a calcination process using a carbon fiber *** porous Zn_(2)TiO_(4)-ZnO micro tubes with a diameter of~4μm consisted of Zn_(2)TiO_(4) and ZnO *** displayed worm-like pore *** fibers played an important role during the porous Zn_(2)TiO_(4)-ZnO microtube formation *** porous and hollow structure of Zn_(2)TiO_(4)-ZnO provided abundant active sensing sites and channels for gas adsorption and *** porous Zn_(2)TiO_(4)-ZnO microtubes exhibited improved gas sensing properties for acetone when compared with pure *** Zn_(2)TiO_(4)-ZnO sensor response was 33.4 for 100μg·ml^(-1) acetone at the optimum operating temperature(370℃).This was~2.7 times higher than that of pure ***,the as-prepared porous Zn_(2)TiO_(4)-ZnO microtubes displayed sufficient long-term acetone stability and *** showed the potential application for acetone *** enhanced Zn_(2)TiO_(4)-ZnO gas sensing properties are due to the unique heterogeneous and porous structure,which was analyzed using the porous and band structure.

关键词： Zn_(2)TiO_(4) Zinc oxide Porous Heterostructure Sensors

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