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Research on Improving the Thermal Conductivity of Epoxy Resin with Flexible Assisted Rigid Groups

Chinese Journal of Polymer science 2024年第11期42卷 1845-1854,I0015页

作者： Hong-Yu Zhu Yan-Ji Zhu Di Bao Lu-Chao Pei Fei Xu Zhe Wang Huai-Yuan Wang School of Materials Science and Engineering Tianjin UniversityTianjin300050China Collaborative Innovation Centre of Chemical Science and Engineering(Tianjin) Tianjin UniversityTianjin300072China Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology Tianjin UniversityTianjin300072China School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering Tianjin UniversityTianjin300350China

Epoxy resins are cross-linked polymeric materials with typically low thermal ***,the introduction of rigid groups into epoxy resins is the main method to improve their intrinsic thermal *** researchers explored the relationship between the flexible chains of epoxy monomers and the thermal conductivity of the modified epoxy resins(MEP).The effect of flexible chain length on the introduction of rigid groups into the cross-linked structure of epoxy is worth investigating,which is of great significance for the improvement of thermal conductivity of polymers and related *** prepared a small molecule liquid crystal(SMLC)containing a long flexible chain via a simple synthesis reaction,and introduced rigid mesocrystalline units into the epoxy resin via a curing *** high-temperature curing,the introduced mesocrystalline units underwent orientational stacking and were immobilized within the *** and TGA tests showed that the ordering within the modified epoxy resin was increased,which improved the thermal conductivity of the epoxy ***,during the above process,the flexible chains of SMLC provide space for the biphenyl groups to align and therefore affect the thermal conductivity of the ***,the MEP-Ⅵcured with SMLC-Ⅵcontaining six carbon atoms in the flexible chain has the highest thermal conductivity of 0.40W·m^(-1)·K^(-1),which is 125%of the thermal conductivity of SMLC-IV of 0.32 W·m^(-1)·K^(-1),111%of the thermal conductivity of SMLC-Ⅷof 0.36W·m^(-1)·K^(-1),and 182%of the thermal conductivity of pure epoxy of 0.22 W·m^(-1)·K^(-1).The introduction of appropriate length flexible chains for SMLC promotes the stacking of rigid groups within the resin while reducing the occurrence of chain *** study will provide new ideas for the enhancement of thermal conductivity of cross-linked polymeric materials.

关键词： Epoxy Resin Polymer Thermal conductivity Rigid group Flexible chain

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Microfluidic reactors for paired electrosynthesis:Fundamentals,applications and future prospects

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Green Energy & Environment 2025年第3期10卷 471-499页

作者： Hao Xue Zhi-Hao Zhao Menglei Yuan Guangjin Zhang Queen Mary University of London Engineering School Northwestern Polytechnical University710129Xi'anChina State Key Laboratory of Solidification Processing and School of Materials Science and Engineering Northwestern Polytechnical University710072Xi'anChina CAS Key Laboratory of Green Process Engineering Institute of Process EngineeringChinese Academy of Sciences100190BeijingChina Center of Materials Science and Optoelectronics Engineering University of ChineseAcademy of Sciences100049BeijingChina

Paired electrosynthesis has received considerable attention as a consequence of simultaneously synthesizing target products at both cathode and anode,whereas the related synthetic efficiency in batch reactors is still undesirable under certain ***,laminar microfluidic reactor offers prospective options that possess controllable flow characteristics such as enhanced mass transport,precise laminar flow control and the ability to expand production scale *** this comprehensive review,the underlying fundamentals of the paired electrosynthesis are initially summarized,followed by categorizing the paired electrosynthesis including parallel paired electrosynthesis,divergent paired electrosynthesis,convergent paired electrosynthesis,sequential paired electrosynthesis and linear paired ***,a holistic overview of microfluidic reactor equipment,integral fundamentals and research methodology as well as channel extension and scale-up strategies is *** established fundamentals and evaluated metrics further inspired the applications of microfluidic reactors in paired *** work stimulated the overwhelming investigation of mechanism discovery,material screening strategies,and device assemblies.

关键词： Paired electrosynthesis Microfluidic reactor Laminar flow Scaling-up strategy

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Effects of carbon content on the microstructure and tensile properties of a low-density steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior

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Tandem engineering for CO_(2)electrolysis toward multicarbon products

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Nano Research 2023年第7期16卷 8670-8683页

作者： Tinghui Yang Min Kuang Jianping Yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Electrocatalysis of CO_(2)toward multicarbon(C_(2+))products have multifaceted applications in the energy and chemical industries,offers an attractive route to mitigate carbon emissions and abate the depletion of fossil ***,the productivity of CO_(2)-to-C_(2+)products suffers from a low selectivity and reaction rate owing to the difficulty in C-C coupling and the multiple electronproton transfer ***,numerous tandem catalysts have been developed to improve the selectivity and formation rate of CO_(2)-to-C_(2+)products via coupled multiple reaction steps,exhibiting high industrial *** review summarized recent progresses in the formation of C_(2+)products from CO_(2)electrolysis on tandem *** this review,we highlight the cooperative regulation strategy of tandem catalysts formed by introducing different types of new components and reveal the relationships between*CO intermediate mass transport and the selectivity of C_(2+)***,theoretical insight into the tandem catalytic mechanisms underlying the enhanced C_(2+)selectivity is also ***,the remaining challenges and opportunities for the electrocatalytic CO_(2)toward C_(2+)products are discussed.

关键词： CO_(2)electrolysis tandem catalysts mass transports spillovers multicarbon compounds

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Study on characteristics of acoustic signals generated by different DC discharge modes

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Plasma science and Technology 2023年第5期25卷 85-92页

作者：熊紫兰王渝淇李孟琦 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430000People’s Republic of China

Acoustic signals contain rich discharge *** this study,the acoustic signal characteristics of transient glow,spark,and glow discharges generated through DC pin–pin discharge were *** signals were analyzed in the time,frequency,and time–frequency domains,and the correlation between the electric and the acoustic signal was studied *** results show that glow discharge does not produce measurable sound *** the other modes,with a decrease in the discharge gap,the amplitude of the acoustic signal increases sharply with mode transformation,the short-time average energy becomes higher,and the frequency components are more ***,the current pulse and sound pressure pulse have a one-to-one relationship in the transient glow and spark regimes,and they are positively correlated in amplitude.A brief theoretical analysis of the mechanism of plasma sound and the trends of signals in different modes is ***,the change in the discharge energy is closely related to the sound generation of the plasma.

关键词： low-temperature plasma DC discharge discharging modes acoustic signal sound generation

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Thermally activated delayed phosphorescence triggered by charge separation state carrier storage in an organic scintillator

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National science Review 2025年第5期12卷 225-233页

作者： Ruo-Yu Cao Yu-Bing Si Qi Yang Zi-Ying Gao Jia-Wang Yuan Yi Zhao Qiu-Chen Peng Kai Li Shuang-Quan Zang Ben Zhong Tang Tianjian Laboratory of Advanced Biomedical Sciences Henan Key Laboratory of Crystalline Molecular Functional Materials College of Chemistry Zhengzhou University State Key Laboratory of Physical Chemistry of Solid Surfaces i Ch EM Fujian Provincial Key Lab of Theoretical and Computational Chemistry and College of Chemistry and Chemical Engineering Xiamen University School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong KongShenzhen(CUHK-Shenzhen)

Organic scintillators are among the most promising due to their inherent merits in terms of heavy metal–free constituents, synthesis designability, affordability of raw materials, and low usage costs. However,the limited X-ray excited luminescence(XEL) property of organic scintillators affects their application. To date, the main approaches for improving the XEL property of organic scintillators have focused on introducing heavy atoms to increase the absorbance of X-rays and establishing new luminescence pathways,such as thermally activated delayed fluorescence(TADF), to increase the exciton utilization efficiency. Even so, the XEL property of organic scintillators is not ideal compared with that of commercial inorganic scintillators. In this work, a highly stable charge separation(CS) state trap was introduced into the design of an organic scintillator. Combined with a unique thermally activated delayed phosphorescence(TADP)process, highly efficient capture and conversion of high-energy carriers are realized. As a result, the exciton generation efficiency dramatically increases, with an ultrahigh XEL intensity, and X-ray afterglow imaging at room temperature is achieved for the first time. This work provides a brand-new strategy for the design of high-performance organic scintillators.

关键词： organic scintillators afterglow charge separation thermally activated delayed phosphorescence X-ray afterglow imaging

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Mechanistic insights into stepwise activation of malachite for enhancing surface reactivity and flotation performance

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2159-2172页

作者： Qicheng Feng Wanming Lu Han Wang Qian Zhang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources Kunming University of Science and TechnologyKunming 650093China

Malachite is a common copper oxide mineral that is often enriched using the sulfidization-xanthate flotation ***,the direct sulfidization method cannot yield copper concentrate ***,a new sulfidization flotation process was developed to promote the efficient recovery of *** this study,Cu^(2+) was used as an activator to interact with the sample surface and increase its reaction sites,thereby strengthening the mineral sulfidization process and *** to single copper ion activation,the flota-tion effect of malachite significantly increased after stepwise Cu^(2+) *** potential,X-ray photoelectron spectroscopy(XPS),time-of-flight secondary ion mass spectroscopy(ToF-SIMS),scanning electron microscopy and energy dispersive spectrometry(SEM-EDS),and atomic force microscopy(AFM)analysis results indicated that the adsorption of S species was significantly enhanced on the mineral surface due to the increase in active Cu sites after Cu^(2+) stepwise ***,the proportion of active Cu-S spe-cies also increased,further improving the reaction between the sample surface and subsequent ***-transform infrared spec-troscopy(FT-IR)and contact angle tests implied that the xanthate species were easily and stably adsorbed onto the mineral surface after Cu^(2+) stepwise activation,thereby improving the hydrophobicity of the mineral ***,the copper sites on the malachite sur-face after Cu^(2+) stepwise activation promote the reactivity of the mineral surface and enhance sulfidization flotation of malachite.

关键词： malachite copper ions stepwise activation flotation mechanism enhanced sulfidization

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Tilted Perpendicular Anisotropy-Induced Spin-Orbit Ratchet Effects

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Chinese Physics Letters 2024年第7期41卷 181-186,I0001,I0002,I0003页

作者：陈彬龙垣图聂宇林凌姿瑀马天平张瑞轩吴义政骆泳铭王宁宁 School of Electronics and Information Engineering Hangzhou Dianzi UniversityHangzhou 310018China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Research Center for Intelligent Computing Platforms Zhejiang LaboratoryHangzhou 311121China Wenzhou Institute of Hangzhou Dianzi University Wenzhou 325038China Anhui Key Laboratory of Magnetic Functional Materials and Devices School of Materials Science and EngineeringAnhui UniversityHefei 230601China

Using micromagnetic simulations, we demonstrate the tilted perpendicular anisotropy-induced spin-orbit ratchet effect. In spin-orbit torque(SOT)-induced magnetization switching, the critical currents required to switch between the two magnetization states(upward and downward magnetization) are asymmetric. In addition, in the nanowire structure, tilted anisotropy induces formation of tilted domain walls(DWs). The tilted DWs exhibit a ratchet behavior during motion. The ratchet effect during switching and DW motions can be tuned by changing the current direction with respect to the tilting direction of anisotropy. The ratchet motion of the DWs can be used to mimic the leaky-integrate-fire function of a biological neuron, especially the asymmetric property of the “potential” and “reset” processes. Our results provide a full understanding of the influence of tilted perpendicular anisotropy on SOT-induced magnetization switching and DW motion, and are beneficial for designs of further SOT-based devices.

关键词： motion effect magnetization

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Study on the Load Characteristics of Submerged Body Under Internal Solitary Waves on the Continental Shelf and Slope

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China Ocean engineering 2024年第5期38卷 809-820页

作者： LIU Qian CUI Jian MEI Huan GAO Jun-liang WU Xiang-bai ZHANG Dai-yu ZHANG Rui-rui SHANG Xiao-dong School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China

Based on the high-quality observation data and the numerical simulation,the evolution characteristics of internal solitary waves(ISWs)and the load on the suspend submerged body are studied on the continental shelf and slope *** observed ISWs exhibit the first mode depression *** amplitudes of ISWs on the shelf and slope areas reach 50 m and 80 m,*** upper layer velocity in the westward direction is about 0.8 m/s on the continental shelf and 0.9 m/s on the continental slope during the passing through of *** lower layer is dominated by the eastward compensating *** the vertical direction,the water in front of the wave flows downward,while the water behind the wave flows upward,and the maximum vertical velocity exceeds 0.2 m/*** simulation results show that the larger the amplitude of ISWs,the larger the load on the submerged *** force on the submerged body by ISWs is dominated by the vertical force,and the corresponding maximum vertical forces on the continental shelf and slope are−25 kN and −27 *** submerged body is subjected to a large counterclockwise moment and the sudden change of the moment will also cause the submerged body to *** paper not only gives a deeper understanding of the characteristics of ISWs from the deep continental slope to the shallow continental shelf,but also has a certain guiding value for the prediction of ISWs and for marine military activities.

关键词： internal solitary waves submerged body CFD horizontal force vertical force moment South China Sea

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A DECOUPLED,LINEARLY IMPLICIT AND UNCONDITIONALLY ENERGY STABLE SCHEME FOR THE COUPLED CAHN-HILLIARD SYSTEMS

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Journal of Computational Mathematics 2025年第3期43卷 708-730页

作者： Dan Zhao Dongfang Li Yanbin Tang Jinming Wen School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan 430074China College of Information Science and Technology Jinan UniversityGuangzhou 510632China

We present a decoupled,linearly implicit numerical scheme with energy stability and mass conservation for solving the coupled Cahn-Hilliard *** time-discretization is done by leap-frog method with the scalar auxiliary variable(SAV)*** only needs to solve three linear equations at each time step,where each unknown variable can be solved *** is shown that the semi-discrete scheme has second-order accuracy in the temporal *** convergence results are proved by a rigorous analysis of the boundedness of the numerical solution and the error estimates at different *** examples are presented to further confirm the validity of the methods.

关键词： Coupled Cahn-Hilliard system Leap-frog method Scalar auxiliary variable Error estimate

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