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Porous N-doped Ni@SiO_(2)/graphene network: Three-dimensional hierarchical architecture for strong and broad electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第11期106卷 108-117页

作者： Rui Guo Qi Zheng Lianjun Wang yuchi fan Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China

Electromagnetic wave absorber is critical for reducing increasingly serious electromagnetic wave pollu-tion,however,the development of lightweight and broadband microwave absorbers remains a pressing *** report here the rational design and synthesis of N-doped Ni@SiO_(2)/graphene composite con-structed from 3D interconnected porous graphene network and Ni@SiO_(2) core-shell architecture,which fulfills lightweight and broadband requirements while exhibiting highly efficient electromagnetic wave *** porous graphene network,functioning both as lightweight support and dielectric medi-ator,was synthesized via NaCl template-assisted high-temperature calcination *** uniformly attached with core-shell Ni@SiO_(2) on the surface,the resulting abundant heterogeneous interfaces con-structed by graphene-Ni and Ni-SiO_(2) strongly reinforce polarization *** presence of low dielectric SiO_(2) allows facile tuning of the complex permittivity of ternary composite by adjusting coating thick-ness to balance the attenuation ability and impedance ***,further N-doping of graphene assists in the optimization of dielectric loss *** account of the advantages arising from the porous hierarchical architecture,multiple absorption centers and diverse interfaces,the lightweight com-posite exhibits an ultra-strong reflection loss(RL)value of-71.13 dB at 13.76 GHz with a thickness of 2.46 mm and broad effective absorption bandwidth of 7.04 GHz at a low filler content of 15 wt.%.More importantly,the effective absorption range covers 13.28 GHz(4.72-18 GHz)with the optimized thickness of 1.6-5 mm,representing 83%of the whole range of *** results demonstrate that the novel 3D porous N-doped Ni@SiO_(2)/graphene network with hierarchical architecture is a promising candidate for high-performance electromagnetic wave absorption.

关键词： 3D porous graphene network Ni@SiO_(2)core-shell structure N-doped graphene Hierarchical architecture Electromagnetic wave absorption

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Realizing translucency in aluminosilicate glass at ultralow temperature via cold sintering process

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Journal of Advanced Ceramics 2022年第11期11卷 1714-1724页

作者： Jie GAO Kangjing WANG Wei LUO Xiaowei CHENG yuchi fan Wan JIANG State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of Chemistry Fudan UniversityShanghai 200438China

Glass with high visible-light transparency is widely considered as the most important optical material,which typically requires a processing temperature higher than 1000℃.Here,we report a translucent aluminosilicate glass that can be prepared by cold sintering process(CSP)at merely 300℃.After eliminating structural pores in hexagonal faujasite(EMT)-type zeolite by heat treatment,the obtained highly active nanoparticles are consolidated to have nearly full density by adding NaOH solution as liquid ***,direct densification of EMT powder cannot remove the structural pores of zeolite completely,leading to an opaque compact after the *** is proved that the chemical reaction between the NaOH-and zeolite-derived powders is highly beneficial to dissolution–precipitation process during sintering,leading to the ultra-low activation energy of 27.13 kJ/*** the addition of 5 M NaOH solution greatly promotes the densification via the reaction with aluminosilicate powder,lower or higher concentration of solvent can deteriorate the transmittance of ***,the CSP-prepared glass exhibits a Vickers hardness of 4.3 GPa,reaching 60%of the reported value for spark plasma sintering(SPS)-prepared sample.

关键词： glass cold sintering process(CSP) optical properties mechanical properties

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Mechanically exfoliated MoS_(2) nanoflakes for optimizing the thermoelectric performance of SrTiO_(3)-based ceramic composites

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Journal of Materiomics 2022年第4期8卷 790-798页

作者： Jilong Huang Yongping Liu Peng Yan Jie Gao yuchi fan Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai201620China

As a semiconducting material with relatively low thermal conductivity,MoS_(2) nanoflake has the potential to serve as a modulator for optimizing the performance of thermoelectric(TE)***,the low yield of MoS_(2) nanoflakes prepared by conventional methods has constrained the development of MoS_(2) optimized TE *** propose a mechanical exfoliation method for mass production of MoS_(2) nanoflakes using attrition *** mixed with La and Nb co-doped SrTiO_(3)(SLNT)powder,the MoS_(2)/SLNT composites are fabricated by spark plasma *** is found that the heterojunctions formed at MoS_(2)/SLNT interfaces with proper band offset can effectively scatter the low-energy electrons,resulting in enhanced Seebeck coefficient without significantly undermining the electrical *** power factor of composites is improved when the MoS_(2) content is lower than 1.5 vol%.Meanwhile,the thermal conductivity of composites is significantly decreased due to the phonon scattering induced large thermal resistance at MoS_(2)/SLNT interfaces,which is much higher than that in graphene embedded SrTiO_(3) ***,a maximum ZT-0.24 is obtained at 800 K in 1.5 vol%MoS_(2)/SLNT composite,which is~26%higher compared with pristine *** work paves the way for application of TE materials modulated by transition metal dichalcogenides.

关键词： Thermoelectric MoS_(2) SrTiO_(3) Energy scattering Interfacial thermal resistance

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Highly aligned reduced graphene oxide in alumina composites for strengthening,toughening,and electromagnetic interference shielding

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Journal of Materiomics 2023年第6期9卷 993-1003页

作者： Tufail Mustafa Yongping Liu Jie Gao Peng Yan Qi Ding yuchi fan Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai200050China Department of Chemical Engineering Balochistan University of Information TechnologyEngineering&Management Sciences(BUITEMS)Quetta87300Pakistan

Engineering ceramics with high strength,toughness and electromagnetic interference(EMI)shielding effectiveness(SE)are highly desirable as electromagnetic protecting material in harsh ***,we show that both excellent mechanical and EMI shielding performance can be realized in alumina composites embedded with highly aligned reduced graphene oxide(RGO),which are readily prepared via sintering of core-shell structured RGO@Al_(2)O_(3)nanoplates with *** to monolithic Al_(2)O_(3),the highly aligned RGO/Al_(2)O_(3)composites show simultaneously improved strength and toughness up to~26.1%and~60.2%,*** steeply rising R-curve behavior proves the better crack tolerance in the highly aligned structure with respect to randomly oriented ***,the RGO/Al_(2)O_(3)composites also exhibit a high specific EMI SE reaching~34 dB/mm in K band,due to the reflection and highly enhanced absorption after percolation in the out-of-plane *** findings provide a novel strategy of designing mechanically reliable engineering ceramic for EMI shielding.

关键词： Reduced graphene oxide Ceramic composites Strengthening Toughening Electromagnetic interference shielding

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Graphene controlled phase evolution in Sr-deficient Sr(Ti, Nb)O_(3) thermoelectric ceramics

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Journal of Materiomics 2021年第2期7卷 366-376页

作者： Jia Li Cao Wu Jilong Huang Juanjuan Xing yuchi fan Qingqiao Fu Ying Jiang Hui Gu Materials Genome Institute School of Materials Science and EngineeringShanghai UniversityShanghai200444China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China

Correlated phase and microstructural evolution are systematically investigated by electron microscopies in Sr-deficient Sr(Ti,Nb)O_(3)(STNO)thermoelectric ceramics incorporated with different fraction of reduced graphene oxide(RGO).It is found that while no impurity except for very few Ti_(3)O_(5) precipitates are observed in monolithic STNO,the Nb-enriched rutile TiO_(2) appears in RGO/STNO *** increasing RGO content,the amount of precipitates increase at first and then decrease when RGO content becomes high,which can be ascribed to the formation of local Magneli *** addition,the energy-dispersive X-ray spectra combined with cathodoluminescence characterization indicates that the variation of Sr deficiency experiences the opposite trend with respect to the precipitates *** findings clearly reveal the unique reducing effect of RGO on the microstructure of doped SrTiO_(3) with Sr deficiency,which can greatly facilitate the design of perovskite based thermoelectric materials of hierarchical structure.

关键词： Graphene Second phase Solid solution Reduction Magneli phase

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A confined micro-reactor with a movable Fe_(3) O_(4) core and a mesoporous TiO_(2) shell for a photocatalytic Fenton-like degradation of bisphenol A

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Chinese Chemical Letters 2021年第4期32卷 1456-1461页

作者： Pengpeng Qiu Tao Zhao Xiaohang Zhu Binota Thokchom Jianping Yang Wan Jiang Lianjun Wang yuchi fan Xiaopeng Li Wei Luo State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInstitute of Functional MaterialsShanghai 201620China Indian Institute of Technology Guwahati Guwahati 781039India

Photocatalysis and Fenton process are two primary and promising advanced oxidation processes to degrade organic ***,the practical applications of single photocatalysis and Fenton process are still *** one of them into another to form a combined photocatalytic Fentonlike system has shown great potential but still faces challenges in designing a well-tailored ***,a confined photocatalytic Fenton-like micro-reactor catalyst with a movable Fe_(3) O_(4) core and a mesoporous TiO_(2) shell has been constructed via a successive Stober coating strategy,followed by an ultrasound assisted etching *** resulting micro-reactor possesses well-defined yolk-shell structures with unifo rm mesopores(~4 nm),a large Brunauer-Emmett-Teller(BET) surface area(~166.7 m^(2)/g),a high pore volume(~0.56 cm^(3)/g) and a strong magnetization(~51 emu/g),as well as tunable reactor sizes(20-90 nm).When evaluated for degrading bisphenol A under solar light in the presence of peroxymo no sulfate,the micro-reactor exhibits a superior catalytic degradation perfo rmance with a high magnetic separation efficiency and an excellent recycle *** outstanding performance can be attributed to its unique textual structure,which leads to a great syne rgistic effect from the photocatalytic and Fenton-like *** study gives an important insight into the design and synthesis of an advanced micro-reactor for a combined advanced oxidation processes(AOPs).

关键词： Photocatalytic Fenton-like reaction Yolk-shell Micro-reactor Magnetic Mesoporous

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Achieving effective broadband microwave absorption with Fe_(3)O_(4)@C supraparticles

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Journal of Materiomics 2021年第1期7卷 80-88页

作者： Li Su Jiaxin Ma fangzhou Zhang yuchi fan Wei Luo Lianjun Wang Wan Jiang Jianping Yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China Institute of Functional Materials Donghua UniversityShanghai201620China

The X band(8 GHz-12 GHz)is the electromagnetic wave band emitted by most electronic instruments in our life,which will cause electromagnetic pollution harm to human *** to the coexistence of magnetic loss and dielectric loss,the modified Fe_(3)O_(4)-carbon-based nanomaterial exhibit strong electromagnetic(EM)wave absorptive ***,there is a problem that the effective absorption bandwidth(EAB,the frequency bandwidth of reflection loss is less than-10 dB)of the X band is *** the EAB value of Fe_(3)O_(4)-carbon-based materials is of great significance for reducing electromagnetic ***,an emulsion-based self-assembly technique and ligand carbonization treatment have been used to construct the Fe_(3)O_(4)@C supraparticles for the evaluation of EM *** Fe_(3)O_(4)@C supraparticles exhibit excellent EM absorption properties,which can achieve full coverage of X band from 6.52 GHz to 12.9 GHz at a sample thickness of 3 ***,the optimum EAB value of Fe_(3)O_(4)@C supraparticles is up to 8.55 GHz from 9 to 18 GHz at a sample thickness of 2.5 *** Fe_(3)O_(4)@C supraparticles with superlattice structure will have potential development prospects in the application of broadband absorption.

关键词： Fe_(3)O_(4)nanoparticles Carbon shell Suparparticles Self-assembly Microwave absorption

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Facile synthesis of mesoporous WO3@graphene aerogel nanocomposites for low-temperature acetone sensing

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Chinese Chemical Letters 2019年第12期30卷 2032-2038页

作者： Tao Zhao Yuan Ren Guangyou Jia Yuye Zhao yuchi fan Jianping Yang Xin Zhang Wan Jiang Lianjun Wang Wei Luo State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersiChEMShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200433China Institute of Functional Materials Donghua UniversityShanghai 201620China School of Materials Science and Engineering Jingdezhen Ceramic InstituteJingdezhen 333001China

Nanocomposites constructed by combining mesoporous metal oxides and graphene have received tremendous attention in wide fields of catalysis,energy storage and conversion,gas sensing and so ***,we present a facile interface-induced co-assembly process to synthesize the mesoporous W03@graphene aerogel nanocomposites(denoted as mW03@GA),in which graphene aerogel(GA) was used as a macroporous substrate,mesoporous W03 was uniformly coated on both sides of graphene sheets through a solvent evaporation-induced self-assembly(EISA) strategy using diblock copolymer poly(ethylene oxide)-b-polystyrene(PEO-b-PS) as a *** resultant mW03@GA nanocomposites possess well-interconnected macroporous graphene networks covered by mesoporous W03 layer with a uniform pore size of 19 nm,high surface area of 167 m^2/g and large pore volume of 0.26 cm^3/*** gas sensing performance of mW03@GA nanocomposites toward acetone and other gases was studied,showing a high selectivity and great response to acetone at low temperature of 150℃,which could be developed as a promising candidate as novel sensors for VOCs detection.

关键词： Mesoporous materials Tungsten oxide Graphene Gas sensing Acetone

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Enhanced TE properties of Cu@Ag/Bi2Te3 nanocomposites by decoupling electrical and thermal properties

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Chinese Chemical Letters 2020年第3期31卷 880-884页

作者： Xiaofang Lu Qi Zheng Shijia Gu Rui Guo Li Su Jiancheng Wang Zhenxing Zhou yuchi fan Wan Jiang Lianjun Wang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China School of Material Science and Engineering Jingdezhen Ceramic InstituteJindezhen 333000China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationShanghai 201620China

Cu@Ag/Bi2Te3 nanocomposites were prepared for the first time by ultrasonic dispersion-rapid freezedrying method combined with spark plasma sintering(SPS).By changing the content of Cu@Ag nanoparticle,we could modulate the temperature dependent thermoelectric *** highest ZT value can be obtained at 450 K for 1 vol%Cu@Ag/Bi2Te3,which is benefited from the decoupling of electrical and thermal *** the increase of electrical conductivity,the absolute value of Seebeck coefficient lifts while the thermal conductivity ***,the average ZT value between 300 K and 475 K was 0.61 for 1 vol%Cu@Ag/Bi2Te3,which is much higher than that of pristine Bi2 ***,the decoupling effect of Cu@Ag nanoparticles incorporation could be a promising method to broaden the application of Bi2Te3 based thermoelectric materials.

关键词： Cu@Ag Thermoelectric Bi2Te3 ZT Decoupling effect

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Integrating thin wall into block:A new scanning strategy for laser powder bed fusion of dense tungsten

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Journal of Materials Science & Technology 2022年第25期120卷 167-171页

作者： Zhengang Xiong Ji Zou Zhaoyang Deng Jinhan Chen Wei Liu yuchi fan Minshi Wang Xiaoqing Zhao Chunfeng Yu Dongdong Dong Wenyou Ma Weimin Wang Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Institute of Functional Materials Donghua University201620China School of Metallurgy and Materials University of BirminghamBeijing 100084China

Due to a combination of outstanding properties including high melting point,high density,low thermal expansion coefficient,low saturated vapor pressure and excellent thermal conductivity,tungsten(W)parts have been widely used as electrodes,heating elements,anti-scatter grids for Computed Tomography(CT)equipment,rocket nozzles and divertor materials for nuclear fusion[1].

关键词： powder thermal saturated

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