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Highly Thermally Conductiveand Flame-Retardant Waterborne Polyurethane Composites with 3D BNNS Bridging Structures via MagneticField Assistance

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Nano-Micro Letters 2025年第6期17卷 279-296页

作者： Hao Jiang Yuhui Xie Mukun He Jindao Li Feng Wu Hua Guo Yongqiang Guo Delong Xie Yi Mei Junwei Gu Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials The International Joint Laboratory for Sustainable Polymers of Yunnan ProvinceThe Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan ProvinceFaculty of Chemical EngineeringKunming University of Science and TechnologyKunming 650500People’s Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China

The microstructure design for thermal conduction pathways in polymeric electrical encapsulation materials is essential to meet the stringent requirements for efficient thermal management and thermal runaway safety in modern electronic ***,a composite with three-dimensional network(Ho/U-BNNS/WPU)is developed by simultaneously incorporating magnetically modified boron nitride nanosheets(M@BNNS)and non-magnetic organo-grafted BNNS(U-BNNS)into waterborne polyurethane(WPU)to synchronous molding under a horizontal magnetic *** results indicate that the continuous in-plane pathways formed by M@BNNS aligned along the magnetic field direction,combined with the bridging structure established by U-BNNS,enable Ho/U-BNNS/WPU to exhibit exceptional in-plane(λ//)and through-plane thermal conductivities(λ_(⊥)).In particular,with the addition of 30 wt%M@BNNS and 5 wt%U-BNNS,theλ//andλ_(⊥)of composites reach 11.47 and 2.88 W m^(-1) K^(-1),respectively,which representing a 194.2%improvement inλ_(⊥)compared to the composites with a single orientation of M@***,Ho/U-BNNS/WPU exhibits distinguished thermal management capabilities as thermal interface materials for LED and *** composites also demonstrate excellent flame retardancy,with a peak heat release and total heat release reduced by 58.9%and 36.9%,respectively,compared to ***,this work offers new insights into the thermally conductive structural design and efficient flame-retardant systems of polymer composites,presenting broad application potential in electronic packaging fields.

关键词： Boron nitride nanosheets Magnetic response Structural design Thermal conductivity Flame retardancy

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Multistage microcellular waterborne polyurethane composite with optionally low-reflection behavior for ultra-efficient electromagnetic interference shielding

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材料科学技术（英文版） 2025年第5期208卷 132-140页

作者： Jianming Yang Hu Wang Hexin Zhang Peng Lin Hong Gao Youyi Xia Xia Liao School of Chemistry and Chemical Engineering Anhui University of TechnologyMa'anshan 243032China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China

Electromagnetic interference(EMI)shielding materials with superior shielding efficiency and low-reflection properties hold promising potential for utilization across electronic components,precision in-struments,and fifth-generation communication *** this study,multistage microcellular wa-terborne polyurethane(WPU)composites were constructed via gradient induction,layer-by-layer cast-ing,and supercritical carbon dioxide *** gradient-structured WPU/iron-cobalt loaded reduced graphene oxide(FeCo@rGO)foam serves as an impedance-matched absorption layer,while the highly conductive WPU/silver loaded glass microspheres(Ag@GM)layer is employed as a reflection *** to the incorporation of an asymmetric structure,as well as the introduction of gradient and porous con-figurations,the composite foam demonstrates excellent conductivity,outstanding EMI SE(74.9 dB),and minimal reflection characteristics(35.28％)in 8.2-12.4 GHz,implying that more than 99.99999％of elec-tromagnetic(EM)waves were blocked and only 35.28％were reflected to the external ***-terestingly,the reflectivity of the composite foam is reduced to 0.41％at 10.88 GHz due to the resonance for incident and reflected EM *** that,the composite foam is characterized by low density(0.47 g/cm3)and great stability of EMI shielding *** work offers a viable approach for craft-ing lightweight,highly shielding,and minimally reflective EMI shielding composites.

关键词： Electromagnetic interference shielding Supercritical carbon dioxide(ScCO2) foaming Low reflectivity Multilayered structure Microcellular

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–C≡N functionalizing polycarbonate-based solid-state polymer electrolyte compatible to high-voltage cathodes

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Journal of Energy Chemistry 2024年第11期98卷 422-431页

作者： Shuo Ma Yanan Zhang Donghui Zhang Yating Zhang Wenbin Li Kemeng Ji Zhongli Tang Mingming Chen Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin UniversityTianjin 300350China The Research Center of Chemical Engineering Tianjin UniversityTianjin 300350China

Solid-state polymer electrolytes(SPEs) capable of withstanding high voltage are considered to be key for next-generation energy storage devices with inherent safety as well as high energy *** study involves the rational design of solid-state-C≡N functionalized P(VEC_1-CEA_(0.3))/LiTFSI@CE SPEs and its synthesis by in-situ free radical polymerization of vinyl ethylene carbonate(VEC) and 2-cyanoethyl acrylate(CEA).In situ polymerization yields electrode/electrolyte interfaces with low interfacial resistance,forming a stable SEI layer enriched with LiF,Li_(3)N,and RCOOLi,ensuring stable Li plating/stripping for over 1400 ***-C≡N moiety renders the αH on the adjacent αC positively charged,thereby endowing it with the capability to anchor TFSI^(-).Simultaneously,the incorporation of-C≡N moiety diminishes the electron-donating ability of the C=O,C-O-C,and-C≡N functional groups,facilitating not only the ion conductivity enhancement but also a more rapid Li^(+)migration proved by DFT theoretical calculations and Raman *** room temperature,t_(Li+) of 0.60 for P(VEC_1-CEA_(0.3))/LiTFSI@CE SPEs is achieved when the ionic conductivity σ_(Li+)is 2.63×10^(-4) S cm^(-1) and the electrochemical window is expanded to5.0 *** coin cells with high-areal-loading cathodes and the 6.5-mAh pouch cell,exhibit stable charge/discharge *** 25℃,the 4.45-V Li|P(VEC_1-CEA_(0.3))/LiTFSI@CE|LiCoO_(2) battery performs stable cycling over 200 cycles at 0.2 C,with a capacity retention of 82.1%.

关键词： Lithium-metal batteries High-voltage Solid-state polymer electrolytes –C≡N In situ polymerization

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Epsilon iron carbide derived from Fe4N for ethanol synthesis via ester hydrogenation

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Journal of Energy Chemistry 2025年 108卷 19-29页

作者： Huang, Huijiang Shang, Xin Wang, Qiang Cao, Meng Sun, Fan Liu, Wei Xu, Yan Wang, Junhu Zhao, Yujun Ma, Xinbin Key Laboratory for Green Chemical Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering School of Chemical Engineering and Technology Tianjin University Tianjin300072 China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Liaoning Dalian116023 China

Ethanol synthesis via dimethyl oxalate hydrogenation has garnered increasing attention in the fields of syngas utilization. Although Ε-Fe2C has been identified as a promising active species for DMO hydrogenation to ethanol, its formation is kinetically challenging during carbonization. In this work, a Fe4N phase was first synthesized by pretreating a 30Fe/SiO2 catalyst in an ammonia environment, followed by carbonization in a methanol-H2 flow to obtain Ε-Fe2C as the active phase. Fe4N, rather than Fe[sbnd]O[sbnd]Si, facilitates the transformation into iron carbide during the carbonization process. The transformation pathway of iron nitride (FexN) is mediated by intermediate iron carbonyl species (Fe[sbnd]CO), ultimately leading to the formation of iron carbide as the active phase. The resulting catalyst exhibited 40 times higher catalytic activity than the untreated catalyst in DMO hydrogenation. Combined structure properties and DFT calculation revealed that the lower energy barrier of Ε-Fe2C for ester hydrogenation underpins/strengthens its superior performance, while the STY of Ε-Fe2C is 2.8 times that of Ε′-Fe2.2C and 58 times that of χ-Fe5C2. This study provides a novel strategy for designing highly efficient iron carbide catalysts for the esters hydrogenation system. © 2025 Science Press and Dalian Institute of chemical Physics, Chinese Academy of Sciences

关键词： Hydrogenolysis

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Mechanochemical synthesis of oxygenated alkynyl carbon materials with excellent Hg(Ⅱ) adsorption performance from CaC2 and carbonates

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Green Energy & Environment 2023年第1期8卷 275-282页

作者： Yingjie Li Songping Li Xinyi Xu Hong Meng Yingzhou Lu Chunxi Li State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical TechnologyBeijing100029China College of Chemical Engineering Beijing University of Chemical TechnologyBeijing100029China Anhui Key Lab of Coal Clean Conversion and Utilization School of Chemistry and Chemical EngineeringAnhui University of TechnologyMaanshan243032China

Adsorptive removal of heavy metal ions from wastewater is very important,and the key is the development of efficient *** this work,oxygenated alkynyl carbon materials(OACMs)were synthesized via mechanochemical reaction of CaC_(2) and a carbonate(CaCO_(3),Na2CO_(3),or NaHCO_(3))at ambient *** resultant OACMs are micro mesoporous carbon nanomaterials with high specific area(>648 m2 g^(-1)),highly crosslinked texture,and rich alkynyl and oxygenated *** OACMs exhibit excellent Hg(Ⅱ)adsorption due to the soft acid-soft base interaction between alkynyl and Hg(Ⅱ),and OACM-3 derived from CaC_(2) and NaHCO_(3) has the saturated Hg(Ⅱ)adsorbance of 483.9 mg g^(-1)along with good selectivity and *** adsorption is mainly chemisorption following the Langmuir ***-3 also shows high adsorbance for other heavy metal ions,e.g.256.6 mg g^(-1)for Pb(II),232.4 mg g^(-1)for Zn(II),and 198.7 mg g^(-1)for Cu(II).This work expands the mechnochemical reaction of CaC_(2)with carbonates and possibly other oxyanionic salts,provides a new synthesis approach for functional alkynyl carbon materials with excellent adsorption performance for heavy metal ions,as well as a feasible approach for CO2 resource utilization.

关键词： CaC_(2) Mechanochemistry Alkynyl carbon materials Hg(Ⅱ) Heavy metal Adsorption

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Effects of noise on fluidized bed characteristics measurements by electrical capacitance tomography

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Chinese Journal of chemical engineering 2025年第3期79卷 219-233页

作者： Kai Huang Chunlei Pei Shuanghe Meng Wuqiang Yang Hua Li Mao Ye Jinlong Gong Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and Engineering Tianjin University Dalian National Laboratory for Clean Energy and National Engineering Laboratory for MTO Dalian Institute of Chemical Physics Chinese Academy of Sciences Department of Electrical and Electronic Engineering The University of Manchester Tianjin Normal University

Noise is inevitable in electrical capacitance tomography(ECT) *** paper describes the influence of noise on ECT performance for measuring gas-solids fluidized bed *** noise distribution is approximated by the Gaussian distribution and added to experimental capacitance data with various *** equivalent signal strength(φ) that equals the signal-to-noise ratio of packed beds is used to evaluate noise *** show that the Pearson correlation coefficient,which indicates the similarity of solids fraction distributions over pixels,increases with φ,and reconstructed images are more deteriorated at lower φ Nevertheless,relative errors for average solids fraction and bubble size in each frame are less sensitive to noise,attributed to noise compromise caused by the process of pixel *** findings provide useful guidance for assessing the accuracy of ECT measurements of multiphase flows.

关键词： Electrical capacitance tomography Fluidized bed Measurement Noise Signal-to-noise ratio

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Tuning the crystalline and electronic structure of ZrO_(2)via oxygen vacancies and nano-structuring for polysulfides conversion in lithium-sulfur batteries

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Journal of Energy Chemistry 2024年第1期88卷 82-93,I0003页

作者： Shengnan Fu Chaowei Hu Jing Li Hongtao Cui Yuanyuan Liu Kaihua Liu Yanzhao Yang Meiri Wang Shandong Key Laboratory for Chemical Engineering and Processing School of Chemistry&Chemical EngineeringYantai UniversityYantai 264000ShandongChina Key Laboratory for Special Functional Aggregate Materials of Education Ministry School of Chemistry and Chemical EngineeringShandong UniversityJinan 250100ShandongChina

The recent emergence of tetragonal phases zirconium dioxide(ZrO_(2))with vacancies has generated significant interest as a highly efficient and stable electrocatalyst with potential applications in trapping polysulfides and facilitating rapid conversion in lithium-sulfur batteries(LSBs).However,the reduction of ZrO_(2)is challenging,even under strong reducing atmospheres at high temperatures and ***,the limited presence of oxygen vacancies results in insufficient active sites and reaction interfaces,thereby hindering practical ***,we successfully introduced abundant oxygen vacancies into ZrO_(2)at the nanoscale with the help of carbon nanotubes(CNTs-OH)through hydrogen-etching at lower temperatures and *** introduced oxygen vacancies on ZrO_(2-x)/CNTs-OH can effectively rearrange charge distribution,enhance sulfiphilicity and increase active sites,contributing to high ionic and electronic transfer kinetics,strong binding energy and low redox barriers between polysulfides and ZrO_(2-x).These findings have been experimentally validated and supported by theory *** a result,LSBs assembled with the ZrO_(2-x)/CNTs-OH modified separators demonstrate excellent rate performance,superior cycling stability,and ultra-high sulfur ***,at high sulfur loading of 6 mg cm^(-2),the area capacity is still up to 6.3 mA h cm^(-2).This work provides valuable insights into the structural and functional optimization of electrocatalysts for batteries.

关键词： Lithium-sulfur batteries Oxygen vacancies Zirconium dioxide/carbon nanotubes with–OH Improved redox kinetics Superior cycling stability

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Palladium-catalyzed vinylation of indoles with vinyl ethers via deoxygenative coupling

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Science China Chemistry 2024年第11期67卷 3785-3790页

作者： Bowen Wang Jianxiao Li Wanqing Wu Liangbin Huang Huanfeng Jiang Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641China

Indole is a promising heteroarene in many natural products and pharmaceuticals;therefore, various synthetic methods for indole functionalizations have arisen in recent years. Herein, we report a Pd-catalyzed deoxygenative coupling for the N-vinylation of indoles by employing vinyl ethers. The vinylated indoles could be readily prepared in good to excellent yields with N1-regioselectivity regardless of the electronic characteristics and substitution patterns of indole substrates. Some indole-based pharmaceutical molecules, such as gramine, evodiamine, rutaecarpine, and melatonine, are also successfully vinylated. Moreover, carbazoles and indazoles are shown to participate. Additionally, vinylated indole can readily transform into structurally interesting indole derivatives.

关键词： indole vinylation regioselectivity N-vinyl indole palladium catalyst

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A pseudo transient nonequilibrium method for rigorous simulation of multicomponent separation columns

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Chinese Journal of chemical engineering 2023年第10期62卷 57-64页

作者： Jie Wu Yiqing Luo Xigang Yuan School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Chemical Engineering Research Center Tianjin UniversityTianjin 300350China State Key Laboratory of Chemical Engineering Tianjin UniversityTianjin 300350China

Nonequilibrium stage model is a significant improvement in multicomponent separation process simulation,but more equations are involved and the solution of the model equations,which relies on an adequate initial guess for convergence of the Newton method,is *** this work,based on the concept of pseudo-transient continuation approach,we proposed a new pseudo-transient(PT)nonequilibrium *** proposed method decouples the strongly coupled model equations by introducing dynamic equations for material and energy conservation,as well as transition ***,the steady-state solution of the nonequilibrium stage model can be obtained through a robust and fast integration process,and the initial guess issue in Newton method can be effectively *** simulation cases were used to demonstrate the advantages and applicability of the proposed PT nonequilibrium method.

关键词： Nonequilibrium stage model Pseudo-transient continuation Distillation Numerical simulation Systems engineering

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-Phospha-Brook Rearrangement-Initiated Palladium-Catalyzed Cyclization Reaction of Isocyanides and o-Bromobenzaldehydes:Access to 2H-Isoindole-1-carboxamides and 2H-Isoindole-1-carbonitriles

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Chinese Journal of Chemistry 2025年第6期43卷 620-626页

作者： Binbin Wang Qiushan Gao Huanfeng Jiang Wanqing Wu Key Laboratory of Functional Molecular Engineering of Guangdong Province State Key Laboratory of Luminescent Materials and DevicesSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouGuangdong510640 China

Comprehensive Summary Herein,a[1,2]-phospha-Brook rearrangement-initiated palladium-catalyzed cyclization reaction for base-controlled selective synthesis of 2H-isoindole-1-carboxamide and 2H-isoindole-1-carbonitrile derivatives has been *** strategy features double isocyanide insertion,efficient bond combinations,simple operation and reaction *** studies show that the[1,2]-phospha-Brook rearrangement is the key step in this *** protocol offers a novel and concise strategy for the synthesis of 2H-isoindole derivatives.

关键词： Palladium-catalyzed Cyclization[1,2]-Phospha-Brook rearrangement Isocyanides Insertion Heterocycles

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