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Hierarchical design of FeCo-based microchains for enhanced microwave absorption in C band

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Nano Research 2023年第1期16卷 1773-1778页

作者： Yixuan Han Mukun He Jinwen Hu Panbo Liu Zhongwu Liu Zhonglei Ma Wenbo Ju Junwei Gu shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Physics and Optoelectronics and School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

Microwave absorbing materials(MAMs)has been intensively investigated in order to meet the requirement of electromagnetic radiation control,especially in S and C *** this work,FeCo-based magnetic MAMs are hydrothermally synthesized via a magnetic-field-induced *** composition and morphology of the MAMs are capable of being adjusted simultaneously by the atomic ratio of Fe2+to Co2+in the *** hierarchical magnetic microchain,which has a core–shell structure of twodimensional FexCo1−xOOH nanosheets anchored vertically on the surface of a one-dimensional(1D)Co microchain,shows significantly enhanced microwave absorption in C band,resulting in a reflection loss(RL)of lower than−20 dB at frequencies ranging from 4.4 to 8.0 GHz under a suitable matching *** magnetic coupling of Co microcrystals and the double-loss mechanisms out of the core-shell structure are considered to promote the microwave attenuation *** hierarchical design of 1D magnetic MAMs provides a feasible strategy to solve the electromagnetic pollution in C band.

关键词： one-dimensional micromagnets hierarchical structure microwave absorbing material magnetic coupling double-loss mechanisms

Block copolymer functionalized quartz fibers/cyanate ester wave-transparent laminated composites

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Journal of materials Science & Technology 2023年第8期139卷 189-197页

作者： Jiani Zhang Zheng Liu Muyi Han Junliang Zhang Yusheng Tang Junwei Gu shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072China

A block copolymer of PDMS-b-PGMA is synthesized by polymerizing glycidyl methacrylate(GMA)via reversible addition-fragmentation chain transfer(RAFT)polymerization applying a polydimethylsiloxane(PDMS)based macro-RAFT agent,which is then performed to functionalize the quartz fibers(QFs@PDMS-b-PGMA)via a simple coating ***,the QFs@PDMS-b-PGMA/bisphenol A dicyanate ester(BADCy)wave-transparent laminated composites are fabricated by high-temperature *** magnetic resonance(NMR)spectroscopy,Fourier transform infrared(FT-IR)spectroscopy and size ex-clusion chromatography(SEC)demonstrate the successful preparation of PDMS-b-PGMA with expected *** the molar mass and coating amount of PDMS-b-PGMA are respectively 8100 g/mol and 2.0 wt.%,QFs@PDMS-b-PGMA/BADCy wave-transparent laminated composites present optimal mechan-ical properties and wave-transparent *** interlaminar shear strength(ILSS)and flexural strength are 53.6 and 552.0 MPa,***,the dielectric constant and dielectric loss val-ues are 2.61 and 0.0028 at 1 MHz(wave transmittance of 93.8%),showing good stability at different frequencies(102-106 Hz and 8.4-12.4 GHz)and temperatures(25-250℃).

关键词： Bisphenol A dicyanate ester(BADCy)resins Quartz fibers(QFs) Wave-transparent laminated composites Block copolymer

Breaking Through Bottlenecks for Thermally Conductive polymer Composites:A Perspective for Intrinsic Thermal Conductivity,Interfacial Thermal Resistance and Theoretics

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Nano-Micro Letters 2021年第7期13卷 118-126页

作者： Junwei Gu Kunpeng Ruan MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072P.R.China

Rapid development of energy,electrical and electronic technologies has put forward higher requirements for the thermal conductivities of polymers and their ***,the thermal conductivity coefficient(λ)values of prepared thermally conductive polymer composites are still difficult to achieve expectations,which has become the bottleneck in the fields of thermally conductive polymer *** at that,based on the accumulation of the previous research works by related researchers and our research group,this paper proposes three possible directions for breaking through the bottlenecks:(1)preparing and synthesizing intrinsically thermally conductive polymers,(2)reducing the interfacial thermal resistance in thermally conductive polymer composites,and(3)establishing suitable thermal conduction models and studying inner thermal conduction mechanism to guide experimental ***,the future development trends of the three above-mentioned directions are foreseen,hoping to provide certain basis and guidance for the preparation,researches and development of thermally conductive polymers and their composites.

关键词： Thermally conductive polymer composites Intrinsic thermal conductivity Interfacial thermal resistance Thermal conduction models Thermal conduction mechanisms

High-Efficiency electromagnetic Interference Shielding of rGO@FeNi/Epoxy Composites with Regular Honeycomb Structures

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Nano-Micro Letters 2022年第3期14卷 244-256页

作者： Ping Song Zhonglei Ma Hua Qiu Yifan Ru Junwei Gu shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

With the rapid development of fifth-generation mobile com-munication technology and wearable electronic devices,electromagnetic interference and radiation pollution caused by electromagnetic waves have attracted worldwide ***,the design and development of highly efficient EMI shielding materials are of great *** this work,the three-dimensional graphene oxide(GO)with regular honeycomb structure(GH)is firstly constructed by sacrificial template and freeze-dry-ing ***,the amino functionalized FeNi alloy particles(f-FeNi)are loaded on the GH skeleton followed by in-situ reduction to prepare rGH@FeNi ***,the rGH@FeNi/epoxy EMI shielding com-posites with regular honeycomb structure is obtained by vacuum-assisted impregnation of epoxy *** from the construction of regular honeycomb structure and electromagnetic synergistic effect,the rGH@FeNi/epoxy composites with a low rGH@FeNi mass fraction of 2.1 wt%(rGH and f-FeNi are 1.2 and 0.9 wt%,respectively)exhibit a high EMI shielding effectiveness(EMI SE)of 46 dB,which is 5.8 times of that(8 dB)for rGO/FeNi/epoxy composites with the same rGO/FeNi mass *** the same time,the rGH@FeNi/epoxy composites also possess excellent thermal stability(heat-resistance index and temperature at the maximum decomposition rate are 179.1 and 389.0°C respectively)and mechanical properties(storage modulus is 8296.2 MPa).

关键词： electromagnetic interference shielding rGO@FeNi Epoxy resins Honeycomb structures

Structural Design Strategies of polymer Matrix Composites for electromagnetic Interference Shielding:A Review

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Nano-Micro Letters 2021年第11期13卷 322-350页

作者： Chaobo Liang Zhoujie Gu Yali Zhang Zhonglei Ma Hua Qiu Junwei Gu Key Laboratory of functional Nanocomposites of Shanxi Province College of Materials Science and EngineeringNorth University of ChinaTaiyuan 030051China shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXian 710072China Research and Development Center Guangdong Suqun New Materials Co.LtdDongguan 523000China

With the widespread application of electronic communication technology,the resulting electromagnetic radiation pollution has been significantly *** matrix electromagnetic interference(EMI)shielding materials have disadvantages such as high density,easy corrosion,difficult processing and high price,*** matrix EMI shielding composites possess light weight,corrosion resistance and easy ***,the current polymer matrix composites present relatively low electrical conductivity and poor EMI shielding *** review firstly discusses the key concept,loss mechanism and test method of EMI *** the current development status of EMI shielding materials is summarized,and the research progress of polymer matrix EMI shielding composites with different structures is illustrated,especially for their preparation methods and ***,the corresponding key scientific and technical problems are proposed,and their development trend is also prospected.

关键词： polymer matrix composites electromagnetic interference shielding Structural design

A mini-review of MXene porous films:Preparation,mechanism and application

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Journal of materials Science & Technology 2022年第8期103卷 42-49页

作者： Yali Zhang Yi Yan Hua Qiu Zhonglei Ma Kunpeng Ruan Junwei Gu shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

MXene presents excellent electrical conductivity,abundant surface functional groups and wonderful filmforming performance,but the lamellar layers are prone to self-stacking during film formation,which will reduce the loss of electromagnetic waves,hinder ion transmission,and limit the effective load of other functional *** construction of the porous structure can effectively solve the self-stacking problem of MXene *** article reviews the research progress of MXene porous films for electromagnetic interference(EMI)shielding,lithium/sodium ion batteries,pseudocapacitors,and biomedical science *** focuses on the preparation methods of MXene porous films,and discusses the pore-forming mechanism of the porous structure formed by different preparation methods and the internal relationship between the“microstructure-macroscopic performance”of the MXene porous films,points out the key scientific and technical bottlenecks that need to be solved urgently in the preparation and application of the MXene porous *** is hoped to provide certain guidance for the design,preparation,optimization,industrial application,and development of MXene porous films.

关键词： MXene porous films Preparation method Pore formation mechanism Application fields

Lightweight,Flexible Cellulose-Derived Carbon Aerogel@Reduced Graphene Oxide/PDMS Composites with Outstanding EMI Shielding Performances and Excellent Thermal Conductivities

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Nano-Micro Letters 2021年第6期13卷 126-142页

作者： Ping Song Bei Liu Chaobo Liang Kunpeng Ruan Hua Qiu Zhonglei Ma Yongqiang Guo Junwei Gu MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072P.R.China Xi’an ESWIN Silicon Wafer Technology Co.Ltd Xi’an 710100P.R.China

In order to ensure the operational reliability and infor-mation security of sophisticated electronic components and to protect human health,efficient electromagnetic interference(EMI)shielding materials are required to attenuate electromagnetic wave *** this work,the cellulose solution is obtained by dissolving cotton through hydrogen bond driving self-assembly using sodium hydroxide(NaOH)/urea solution,and cellulose aerogels(CA)are prepared by gelation and ***,the cellulose carbon aerogel@reduced graphene oxide aerogels(CCA@rGO)are prepared by vacuum impregnation,freeze-drying followed by thermal annealing,and finally,the CCA@rGO/polydimethylsiloxane(PDMS)EMI shielding composites are prepared by backfilling with *** to skin-core structure of CCA@rGO,the complete three-dimensional(3D)double-layer con-ductive network can be successfully *** the loading of CCA@rGO is 3.05 wt%,CCA@rGO/PDMS EMI shielding composites have an excellent EMI shielding effectiveness(EMI SE)of 51 dB,which is 3.9 times higher than that of the co-blended CCA/rGO/PDMS EMI shielding composites(13 dB)with the same loading of *** this time,the CCA@rGO/PDMS EMI shielding composites have excellent thermal stability(T_(HRI) of 178.3℃)and good thermal conductivity coefficient(λ of 0.65 W m^(-1) K^(-1)).Excellent comprehensive performance makes CCA@rGO/PDMS EMI shielding composites great prospect for applications in lightweight,flexible EMI shielding composites.

关键词： Polydimethylsiloxane electromagnetic interference shielding Cellulose carbon aerogel Reduced graphene oxide

Advances in 3D printing for polymer composites:A review

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InfoMat 2024年第6期6卷 1-30页

作者： Tengbo Ma Yali Zhang Kunpeng Ruan Hua Guo Mukun He Xuetao Shi Yongqiang Guo Jie Kong Junwei Gu shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'anShaanxithe Pepole's Republic of China

The potential of three-dimensional(3D)printing technology in the fabrication of advanced polymer composites is becoming increasingly *** review discusses the latest research developments and applications of 3D printing in polymer ***,it focuses on the optimization of 3D printing technology,that is,by upgrading the equipment or components or adjusting the printing parameters,to make them more adaptable to the processing characteristics of polymer composites and to improve the comprehensive performance of the ***,it focuses on the 3D printable novel consumables for polymer composites,which mainly include the new printing filaments,printing inks,photosensitive resins,and printing powders,introducing the unique properties of the new consumables and different ways to apply them to 3D ***,the applications of 3D printing technology in the preparation of functional polymer composites(such as thermal conductivity,electromagnetic interference shielding,biomedicine,self-healing,and environmental responsiveness)are explored,with a focus on the distribution of the functional fillers and the influence of the topological shapes on the properties and functional characteristics of the 3D printed *** aim of this review is to deepen the understanding of the convergence between 3D printing technology and polymer composites and to anticipate future trends and applications.

关键词： 3D printing functional properties new consumables polymer composites

Thermally Conductive Poly(lactic acid) Composites with Superior electromagnetic Shielding Performances via 3D Printing Technology

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Chinese Journal of polymer Science 2022年第3期40卷 248-255,I0006页

作者： Teng-Bo Ma Hao Ma Kun-Peng Ruan Xue-Tao Shi Hua Qiu Sheng-Yuan Gao Jun-Wei Gu shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China

This work proposes a facile fabrication strategy for thermally conductive graphite nanosheets/poly(lactic acid) sheets with ordered GNPs(o-GNPs/PLA) via fused deposition modeling(FDM) 3 D printing *** combinations of o-GNPs/PLA with Ti_(3) C_(2) T_(x) films prepared by vacuum-assisted filtration were carried out by "layer-by-layer stacking-hot pressing" to be the thermally conductive Ti_(3) C_(2) T_(x)/(oGNPs/PLA) composites with superior electromagnetic interference shielding effectiveness(EMI SE).When the content of GNPs was 18.60 wt%and 4 layers of Ti_(3) C_(2) T_(x)(6.98 wt%) films were embedded,the in-plane thermal conductivity coefficient(λ_(Ⅱ)) and EMI SE(EMI SE_(Ⅱ)) values of the thermally conductive Ti_(3) C_(2) T_(x)/(o-GNPs/P LA) composites significantly increa sed to 3.44 W·m^(-1)·K^(-1) and 65 d B(3.00 mm),increased by 1223.1% and2066.7%,respectively,compared with λ_(Ⅱ)(0.26 W·m^(-1)·K^(-1)) and EMI SE_(Ⅱ)(3 d B) of neat PLA *** work offers a novel and easily route for designing and manufacturing highly thermally conductive polymer composites with superior EMI SE for broader application.

关键词： polymer-matrix composites(PMCs) Ti_(3)C_(2)T_(x) 3D printing Thermal conductivity electromagnetic interference(EMI)