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Topological Design of Low Dielectric Ladder-like Polysilsesquioxane and Copolymers

Chinese Journal of Polymer science 2025年第3期43卷 477-487页

作者： Wen-Jie Fan Meng Xie Jin-Feng Tian Yan He Shuang Xia Wen-Xin Fu Key Laboratory of Science and Technology on High-Tech Polymer Materials Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China

Low dielectric constant(low-k)materials are critical for advanced packaging in high-density microelectronic devices and high-frequency communication *** polysiloxanes,which are characterized by their unique double-chain structure and intrinsic microporosity,offer remarkable advantages in terms of thermal stability,oxidation resistance,and dielectric ***,structural defects in ladder polysiloxanes,such as cage-like and irregular oligomers,and their effects on dielectric properties remain *** this study,a series of ladder-like polysiloxanes(X-TMS)with diverse side groups weresynthesized via a one-step base-catalyzed *** influence of the benzocyclobutene(BCB)side groups on the formation of regular ladder structures was systematically ***,BCB incorporation disrupted the structural regularity,favoring the formation of cage-like and irregular topologies,which were extensively characterized using 29silicon nuclear magnetic resonance spectroscopy(^(29)Si-NMR),Fourier transform infrared spectroscopy(FTIR),gel permeation chromatography(GPC),and X-ray diffraction(XRD).These structural defects were beneficial for improving the hydrophobicity and thermal *** of X-TMS with commercial DVS-BCB resins further enhanced the mechanical properties,with the elastic modulus increasing from 3.6 GPa to 4.4 GPa and water absorption reduced from 0.33 wt%to 0.06 wt%.This study establishes a clear correlation between topological structures and material *** findings not only advance the understanding of the structure-property relationships in ladder polysiloxanes but also provide a novel approach for designing high-performance interlayer dielectric materials for next-generation microelectronics.

关键词： Ladder polymer Topological structures Polysiloxanes Low dielectric Benzocyclobutene

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Barocaloric effect in ferroelastic Pb_(3)(VO_(4))_(2)

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Chinese Physics B 2025年第3期34卷 506-510页

作者： Pengtao Cheng Zuhua Chen Chengliang Zhang Zhengming Zhang Bing Li Dunhui Wang Hangzhou Dianzi University Hangzhou 310018China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser TechnologyKey Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

The barocaloric effect is considered as one of the most promising refrigeration with the potential to replace traditional gas compression *** of the main obstacles to the application of barocaloric materials lies in the requirement for high driving *** this paper,we report on the barocaloric effect of Pb_(3)(VO_(4))_(2),which exhibits a ferroelastic transition from a high-temperature trigonal structure to a low-temperature monoclinic structure at 357 K,accompanied by a substantial volume *** entropy change induced by hydrostatic pressure can reach up 14 J·kg^(-1)·K^(-1)under a relatively low pressure of 80 *** work is expected to expand the selection range of barocaloric materials.

关键词： solid-state refrigeration barocaloric effect ferroelastic transition

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Custom-assembled phase change modular devices for personalize speciality:Carbon energy thermal management application

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Nano Research 2025年第3期18卷 22-32页

作者： Yilin Chen Huitao Yu Yiyu Feng Wei Feng School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin 300350China Institute of Advanced Technology and Equipment Beijing University of Chemical TechnologyBeijing 100029China

In the context of 5G,the high-frequency cyclicity and inhomogeneity of heat flow put forward higher requirements for the thermal control system of electronic devices,and there is a great need for thermal management modules with fixed point and high efficiency to ensure the long-term development of electronic ***,we selected four phase change molecules with significant differences in phase change temperatures to be composited with graphene aerogel(GA)to obtain Ei@GA,Tetra@GA,Octa@GA,and 1,10-Deca@*** with pure phase change molecules,the thermal conductivity has been increased by more than 20%,and the relative enthalpic efficiency is as high as 98.7%or ***,we assembled the four phase change composites by“reduction welding”to obtain the integrated,modular thermal management device M1-PCMs@*** of inhomogeneous heat generation in electronics by building an inhomogeneous heat generation *** with the homogeneous modules M2-Ei@GA and M3-1,10-Deca@GA,the effective temperature control time of the customized module M1-PCMs@GA is extended by 100.0 and 394.3 s,***,custom-assembled modular thermal management devices have important application prospects in the field of intelligent temperature control of electronic devices,and the idea of cascade assembly enriches the application functions and development direction of intelligent thermal managers.

关键词： graphene aerogel phase change materials assembly customization modular thermal management devices

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Mechanical properties of sandstone under in-situ high-temperature and confinement conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第4期32卷 778-787页

作者： Liyuan Liu Juan Jin Jiandong Liu Wei Cheng Minghui Zhao Shengwen Luo Yifan Luo Tao Wang Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China Key Laboratory of Oil&Gas Production China National Petroleum CorporationBeijing 100083China Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China Research Institute of Oil and Gas Technology PetroChina Qinghai Oilfield CompanyDunhuang 736202China School of Future Cities University of Science and Technology BeijingBeijing 100083China

Low-to medium-maturity oil shale resources display substantial reserves, offering promising prospects for in-situ conversion inChina. Investigating the evolution of the mechanical properties of the reservoir and caprock under in-situ high-temperature and confine-ment conditions is of considerable importance. Compared to conventional mechanical experiments on rock samples after high-temperat-ure treatment, in-situ high-temperature experiments can more accurately characterize the behavior of rocks in practical engineering,thereby providing a more realistic reflection of their mechanical properties. In this study, an in-situ high-temperature triaxial compressiontesting machine is developed to conduct in-situ compression tests on sandstone at different temperatures(25, 200, 400, 500, and 650℃)and confining pressures(0, 10, and 20 MPa). Based on the experimental results, the temperature-dependent changes in compressivestrength, peak strain, elastic modulus, Poisson's ratio, cohesion, and internal friction angle are thoroughly analyzed and discussed. Resultsindicate that the mass of sandstone gradually decreases as the temperature increases. The thermal conductivity and thermal diffusivity ofsandstone exhibit a linear relationship with temperature. Peak stress decreases as the temperature rises, while it increases with higher con-fining pressures. Notably, the influence of confining pressure on peak stress diminishes at higher temperatures. Additionally, as the tem-perature rises, the Poisson's ratio of sandstone decreases. The internal friction angle also decreases with increasing temperature, with 400℃ acting as the threshold temperature. Interestingly, under uniaxial conditions, the damage stress of sandstone is less affected by tem-perature. However, when the confining pressure is 10 or 20 MPa, the damage stress decreases as the temperature increases. This study en-hances our understanding of the influence of in-situ high-temperature and confinement conditions on the

关键词： in-situ high temperature mechanical property thermal damage thermomechanical coupling

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High-Temperature Heat Flux Sensor Based on Composite Ceramic thermal Resistance Layer

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IEEE Sensors Journal 2025年第9期25卷 14668-14677页

作者： Pang, Junqi Shang, Ze Zhang, Lei Qin, Yongqiang Zhang, Xiangxiang Ma, Hongshuai Tan, Qiulin North University of China Key Laboratory of Micro/Nano Devices and Systems Ministry of Education Taiyuan030051 China Science and Technology on Space Physics Technology Laboratory Beijing100076 China

Surface heat flux density is critical for aerospace components, especially engine blades and turbine disks that operate at high temperatures. Conventional water-cooled sensors are impractical for in situ testing, and thin-film heat flux sensors (HFSs) have limited high-temperature durability. To overcome those shortcomings, this study proposes a design method for the high-temperature HFS (HTHFS) that eliminates the need for a water-cooled structure and has excellent high?temperature performance. The HTHFS features a three-layer coated structure comprising a 99% Al2O3 ceramic substrate, PtRh10/Pt thermopile sensitive layer, and composite ceramic thermal resistance layer (TRL). The effective hot junctions of the HTHFS contact the heat source directly, while the rest of the sensor surface is coated with the TRL of low thermal conductivity and high temperature resistant. The proposed design improves the oxidation resistance, sensitivity, and transient response. The HTHFS was fabricated using screen-printing and air spraying processes. Repeatability, stability, and temperature resistance test results for the HTHFS reveal that the average heat flux at 1400 ?C was 403.27 kW/m2 , with a sensitivity of 3.58 V/(kW/m2 ). The dynamic response time (T90), measured via the laser impulse response method, was 1.08 ms. Notably, the HTHFS operated at 1400 ?C for more than 5 h without failure. Characterized by low thermal impedance, high-temperature resistance, rapid response, and high reliability, the HTHFS can accurately measure the heat flux, making it highly valuable for in situ sensing applications in high-temperature aerospace components. © 2001-2012 IEEE.

关键词： Screen printing

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Effect of order–disorder transition on thermodynamic and electronic properties of σ and χ phases in W–Re alloy: the first-principles calculation

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Tungsten 2025年第1期7卷 195-213页

作者： Zhi-Peng Zhu Dian Jia William Yi Wang Jun-Lei Yin Xing-Yu Gao Shu-Feng Yang Hai-Feng Song Jin-Shan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The Tungsten-Rhenium(W-Re) alloys,celebrated for their high melting point,strength at elevated temperatures,electrical resistivity,and radiation resistance,have been widely utilized in high-temperature components,aerospace,electronics,and nuclear *** constituents of the topologically close-packed(TCP) phases,the sigma phase(σ) and chi phase(χ) formed within W-Re alloys wield considerable influence on the mechanical properties and the stability of the *** calculations were utilized in the present work to explore the structural,thermodynamic,and electronic properties of both ordered and disordered configurations within the σ and χ phases,culminating in a systematic elucidation of the higher phase stability exhibited by the ordered *** is found that the bulk modulus of these two phases is directly proportional to the concentration of Re in the alloy,while the equilibrium volume is inversely *** thermodynamic parameters of the σ and χ phases are calculated via the mean-field potential *** similar trends observed in the isobaric heat capacity,enthalpy increment,and entropy change curves for these two phases suggest they possess comparable thermodynamic *** is noteworthy that the contribution of ionic vibrations predominantly affects the isobaric heat capacity,while the contribution of thermal electronic excitations increases linearly with *** the structure and thermodynamic properties of TCP phases in W-Re alloys at low temperatures has profound significance for optimizing material performance,microstructures features,establishing theoretical foundations,and predicting material behavior.

关键词： First-principles calculations Phase stability Thermodynamic properties W-Re alloy TCP phases

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Buried interface bridging for inverted cesium-formamidinium triiodide perovskite solar cells with long operational stability

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science China Chemistry 2025年第1期68卷 163-173页

作者： Chenhui Zhang Chunjun Liang Fulin Sun Ting Zhu Xinghai Huang Yuzhu Guo Xinyu Guo Kunyang Ge Dan Li Fangtian You Zhiqun He Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China Department of Physics School of Physical Science and EngineeringBeijing Jiaotong UniversityBeijing 100044China

In the field of perovskite solar cells(PSCs),the research on defects in the buried interface has been relatively limited due to its non-exposure;however,this interface significantly impacts the performance enhancement of inverted *** study employs phenylethylammonium chloride(PEACl)molecules as a buffer layer to modify the buried interface of p-i-n structured PSCs,aiming to enhance the uniformity of self-assembled monolayers(SAMs)and facilitate the uniform nucleation and growth of perovskite films on the ***,the introduction of the PEACl buffer layer effectively passivates defects at the bottom of the perovskite layer and notably enhances the crystal quality of the perovskite film by mitigating residual stress,thereby reducing nonradiative recombination *** these optimizations,the MA-free PSCs treated with PEACl achieve a power conversion efficiency(PCE)of 24.11%,with significant improvements in storage,thermal stability,and operational *** noteworthy is the device's performance in an unencapsulated state,whereas after 1,500 hours of continuous light operation stability testing,it retains 97%of its original *** study not only enriches the systematic understanding of the characteristics of the buried interface in PSCs but also contributes significantly to advancing the commercial production of perovskite photovoltaic technology.

关键词： defect-induced recombination buried interfaces inverted perovskite solar cells crystallization lattice mismatch

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3D Printing of Metal and Alloy Nanoarchitectures through a Complexation-Driven Strategy

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Nano Letters 2025年第20期25卷 8294-8302页

作者： Han, Changjian Li, Rui Jiang, Modong Huang, Kunjing Tao, Yuan Wang, Dong Wang, Guorui Ni, Jincheng Hu, Yanlei Wu, Dong Chu, Jiaru Li, Jiawen CAS Key Laboratory of Mechanical Behavior and Design of Materials Key Laboratory of Precision Scientific Instrumentation Anhui Higher Education Institutes Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei230027 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230027 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Science Beijing100190 China

3D metal/alloy nanoarchitectures demonstrate transformative potential for next-generation technologies including metamaterials, nanophotonics, and microrobotics. Current metal/alloy nanomanufacturing methods are often restricted to limited metals and simple geometries. Herein, we propose a versatile and scalable method for fabricating 3D metal-alloy nanoarchitectures through a complexation-driven strategy. By leveraging the complexation of metal ions with carboxyl groups, various metal ions are incorporated into acrylic acid-based polymer scaffolds. Subsequent thermal decomposition and reduction transform these scaffolds into metallic nanoarchitectures. As most metal ions can engage in complexation, we successfully fabricated seven distinct elemental metal nanoarchitectures and their corresponding alloy variants, substantiating the versatility of our method. This work establishes a scalable platform for nanoscale metal and alloy manufacturing, opening new possibilities for advanced nanoengineering applications. © 2025 American Chemical Society.

关键词： 3D printing complexation metal/alloy nanoarchitecture two-photon lithograph

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Synergistic surface restructuring and cation mixing via ultrafast Joule heating enhancing ultrahigh-nickel cathodes for advanced lithium-ion batteries

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Journal of Energy Chemistry 2025年第4期103卷 371-382页

作者： Haoyu Wang Jinyang Dong Meng Wang Yun Lu Hongyun Zhang Jinzhong Liu Yun Liu Na Liu Ning Li Qing Huang Feng Wu Yuefeng Su Lai Chen School of Materials Science and Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Chongqing Innovation Center Beijing Institute of TechnologyChongqing 401120China Testing Centre of Power Batteries China North Vehicle Research InstituteBeijing 100072China

The implementation of ultrahigh-Ni cathodes in high-energy lithium-ion batteries(LIBs)is constrained by significant structural and interfacial degradation during *** this study,doping-induced surface restructuring in ultrahigh-nickel cathode materials is rapidly facilitated through an ultrafast Joule heating *** functional theory(DFT)calculations,synchrotron X-ray absorption spectroscopy(XAS),and single-particle force test confirmed the establishment of a stable crystal framework and lattice oxygen,which mitigated H2-H3 phase transitions and improved structural ***,the Sc doping process exhibits a pinning effect on the grain boundaries,as shown by scanning transmission electron microscopy(STEM),enhancing Li~+diffusion kinetics and decreasing mechanical strain during *** in situ development of a cation-mixing layer at grain boundaries also creates a robust cathode/electrolyte interphase,effectively reducing interfacial parasitic reactions and transition metal dissolution,as validated by STEM and time-of-flight secondary ion mass spectrometry(TOF-SIMS).These synergistic modifications reduce particle cracking and surface/interface degradation,leading to enhanced rate capability,structural integrity,and thermal ***,the optimized Sc-modified ultrahigh-Ni cathode(Sc-1)exhibits 93.99%capacity retention after 100 cycles at 1 C(25℃)and87.06%capacity retention after 100 cycles at 1 C(50℃),indicating excellent cycling and thermal *** presenting a one-step multifunctional modification approach,this research delivers an extensive analysis of the mechanisms governing the structure,microstructure,and interface properties of nickel-rich layered cathode materials(NCMs).These results underscore the potential of ultrahigh-Ni cathodes as viable candidates for advanced lithium-ion batteries(LIBs)in next-generation electric vehicles(EVs).

关键词： Lithium-ion batteries Ultrahigh-nickel layered cathodes In situ surface doping Cation mixing layer Structure and thermal stability

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Insight into slag-enhanced thermal desorption at the organo-mineral interface of clay soils

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Pedosphere 2025年第2期35卷 312-324页

作者： Juan ZHANG Xin WANG Xinyue DU Shukai FAN Hui LIU Minghua ZHANG State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Mineral Processing Environmental Engineering InstituteBGRIMM Technology Group Shandong Institute of Geophysical & Geochemical Exploration College of Agricultural and Environmental Sciences University of California

Multiple active components in steel slags can optimize soil texture and catalyze the thermal desorption of refractory organic pollutants,especially polycyclic aromatic hydrocarbons （PAHs）.In this study,a safety and risk assessment was conducted on toxic metals present in collected steel slags,and the refining slag with a high content of free-Ca O from the XG iron and steel plant （XGRS） was selected and used to regulate the plasticity index （PI） of clay *** the clay soil with high liquid limit and high plasticity （CH）,the PI reduced from 34.3% to 24.8% with steel slags at an addition ratio of 10%（mass percent）,and for the clay soil with low liquid limit （CL）,the PI decreased from 22.8% to 16.5%,resulting in silt soil with optimal thermal *** thermal removal efficiency of PAHs in CH decreased from 81.9% to 74.0% at 350°C as the soil water content increased from 0 to 150 g kg-1,due to the hydration and swelling of clay minerals and the heat loss associated with dehydroxylation and *** efficiency further decreased to 68.7% using 2%（mass percent） Ca O as an additive due to the delayed dehydr（oxyl）ation of clay minerals and enhanced aromatization of soil organic *** contrast,addition of 2% high-content titania-bearing slag （HTBS） enhanced the removal efficiency of high-ring PAHs,with the efficiency increasing for 5-ring from 52.6% to 59.7% and for 6-ring from 76.6% to 81.8%.This is due to the presence of amorphous TiO2and crystalline CaTiO3in HTBS,which can degrade water to produce reactive oxygen *** 2% XGRS addition facilitated the complete removal of PAHs by air-supplemented lattice oxygen,leading to the oxidation of C–C bonds in CH to C–O,C=O,and O–C=O functional *** study provides valuable insights into the use of additives to enhance the thermal remediation of PAH-contaminated clay soils via activating oxygen species and oxidizing C–C bonds in organo-mineral complexes within clay soils.

关键词： catalytic degradation clay dehydration origanic pollutants polycyclic aromatic hydrocarbons reactive oxygen species remediation steel slags

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