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Efficient Electromagnetic Wave Absorption and Thermal Infrared Stealth in PVTMS@MWCNT Nano‑Aerogel via Abundant Nano‑Sized Cavities and Attenuation Interfaces

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Nano-Micro Letters 2024年第1期16卷 370-383页

作者： Haoyu Ma Maryam Fashandi Zeineb Ben Rejeb Xin Ming Yingjun Liu Pengjian Gong Guangxian Li Chul B.Park co.lege of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan University24 Yihuan RoadNanyiduanChengdu 610065SichuanPeople’s Republic of China Microcellular Plastics Manufacturing Laboratory Department of Mechanical and Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoON M5S 3G8Canada Jiangsu JITRI Advanced Polymer materials Research Institute Tengfei Building88 Jiangmiao RoadJiangbei New DistrictNanjing 211800JiangsuPeople’s Republic of China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang University38 Zheda RoadHangzhou 310027People’s Republic of China

Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was co.structed via radical polymerization,sol-gel transition and supercritical co.(2)*** fabricated organic-inorganic hybrid PVTMS@MWCNT aerogel structure shows nano-pore size(30-40 nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is beneficial for efficiently blocking thermal co.duction and thermal co.vection via Knudsen effect(beneficial for infrared(IR)stealth);(2)the heterogeneous interface was beneficial for IR reflection(beneficial for IR stealth)and MWCNT polarization loss(beneficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was beneficial for enhancing thermal insulation(beneficial for IR stealth)and EMW impedance match(beneficial for EMW attenuation).Guided by the above theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW absorption property(co.er all Ku-band)and thermal IR stealth property(ΔT reached 60.7℃).Followed by a facial co.bination of the above nano-aerogel with graphene film of high electrical co.ductivity,an extremely high electromagnetic interference shielding material(66.5 dB,2.06 mm thickness)with superior absorption performance of an average absorption-to-reflection(A/R)co.fficient ratio of 25.4 and a low reflection bandwidth of 4.1 GHz(A/R ratio more than 10)was experimentally obtained in this work.

关键词： Nano-pore size Heterogeneous interface Electromagnetic wave absorption Thermal infrared stealth Nano-aerogel

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Mechanical Properties and Microco.mic Properties of Self-co.pacting co.crete Modified by co.pound Admixtures

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Journal of Renewable materials 2022年第4期10卷 897-908页

作者： Song Yang Bing Qi Zubin Ai Zhensheng Cao Shiqin He Lijun Li Power China Roadbridge Group co. Ltd.Beijing100048China co.lege of Civil Engineering North China University of TechnologyBeijing100043China sichuan tieke new building materials co. Ltd.Chengdu610000China

It has beco.e a research hotspot to explore raw material substitutes of *** is important to research the mechanical properties of self-co.pacting co.crete(SCC)with slag powder(SP)and rubber particle(RP)replacing cement and co.rse aggregate,respectively.12 kinds of co.posite modified self-co.pacting co.crete(CMSCC)specimens were prepared by using 10%,20%and 30%SP and 30%,40%,50%and 60%*** rheological properties,mechanical properties and microstructure of the CMSCC were *** indicate that the workability,co.pressive strength,splitting tensile strength and flexural strength of CMSCC prepared by 20%SP and less than 40%RP are *** order to maximize the utilization of waste materials,20%SP and 40%RP can be used as the optimal ratio of the co.bined *** microstructure shows that the addition of proper amount of SP is co.ducive to the formation of increasingly more uniform C-S-H gel.C-SH gel can fill the internal pores of the sample and enhance the adhesion between the aggregate,thus improving the mechanical properties of *** has a rougher surface and lower density and stiffness,which inhibits the workability and mechanical properties of *** above research results have important theoretical and practical significance for the selection of raw materials of self-co.pacting co.crete and the rational use of industrial wastes.

关键词： Self-co.pacting co.crete slag powder rubber particle mechanical properties microstructure

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Stepwise co.loidal lithography toward scalable and various planar chiral metamaterials

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Rare Metals 2024年第2期43卷 723-735页

作者： Xiu Yang Yong Liu Fei-Liang Chen Qian-Qi Lin Rohit Chikkaraddy Shan-Shan Huang Shi-Lin Xian Yi-Dong Hou Jing-Lei Du Liang-Ping Xia Chun-Lei Du School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China Zhuhai Multiscale Optoelectronics Technology co. Ltd.Zhuhai915060China Hybrid materials for Opto-Electronics Group Department of Molecules and MaterialsMESA+Institute for NanotechnologyMolecules Center and Center for Brain-Inspired Nano SystemsFaculty of Science and TechnologyUniversity of Twente7500 AEEnschedeThe Netherlands School of Physics and Astronomy University of BirminghamBirminghamB152TTUK co.lege of Physics Sichuan UniversityChengdu610065China Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems Yangtze Normal UniversityChongqing408100China

Chiral metamaterials(CMs)co.posed by artificial chiral resonators have attracted great attentions in the recent decades due to their strong chiroptical resonance and identifiable interaction with chiral materials,facilitating practical applications in chiral biosensing,chiral emission,and display ***,the co.plex geometry of CMs improves the fabrication difficulty and hinders their scalable fabrication for practical applications,especially in the visible and ultraviolet *** potential strategy is the co.loidal lithography that enables parallel fabrication for scalable and various planar ***,we demonstrate a stepwise co.loidal lithography technique that uses sequential deposition from multiple CMs and expand their variety and *** geometry and optical chirality of building blocks from single deposition are systematically investigated,and their co.bination enables a significant extension of the range of chiral patterns by multiple-step *** approach resulted in a myriad of co.plex designs with different characteristic sizes,co.positions,and shapes,which are particularly beneficial for the development of nanophotonic *** addition,we designed a flexible chiral device based on PDMS,which exhibits a good CD value and excellent stability even after multiple inward and outward *** excellent co.patibility to various substrates makes the planar CMs more flexible in practical applications in microfluidic biosensing.

关键词： Chiral metamaterials co.loidal lithography Nanophotonics Metasurfaces Plasmonics Nanofabrications Flexible devices

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Effects of Heat-treatment Temperature on Eu^(3+) and Li^+ co.doped ZnO Photoluminescence by Sol-gel Process

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Journal of Wuhan University of Technology(materials Science) 2008年第1期23卷 20-23页

作者：卢忠远 HE Fangfang 许丕池 TENG Yuancheng WANG Bing Key Lab for Advanced building materials of sichuan Province Southwest University of Science and Technology Mianyang 621010 China

The photoluminescence （PL） characteristics of Eu^3＋ and Li^＋ co.doped ZnO PL materials against heat-treatment temperature were discussed. The PL xerogel and powder samples were prepared by solgel process. The emission spectra of all samples showed two broad bands peaking at 590 nm and 620 nm under UV-Vis excitation. But the relative intensity of red PL （620 nm） was much greater than that of green PL （590 nm） of the same sample, that s to say, the red co.or was the main luminescence. With heat-treatment temperature increase, the two kinds of co.ors PL intensity decreased, and both the red and green PL intensity of the xerogel samples was much greater than those of powder samples respectively. The XRD patterns revealed that Eu^3＋ ions were successfully inco.porated in ZnO crystals in xerogel samples. When heat-treatment temperature reached 350 ℃, the Eu^3＋ began to separate out of the ZnO crystals and Eu2O3 crystals came into being. When the powder sample was subjected to UV-Vis excitation, the energy transfered from the host ZnO emission to Eu^3＋ became weaker than the xerogel sample.

关键词： photoluminescence Eu^3+ and Li^+ co.doped ZnO UV-Vis excitation, xerogel powder

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Preparation of calcium carbonate with microstructure and nanostructure from carbide slag for co.(2) sequestration by using recyclable ammonium chloride

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Particuology 2024年第7期90卷 1-9页

作者： Jin Yao Qiuju Chen Li Zeng Wenjin Ding Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle Southwest University of Science and TechnologyMianyang621010China sichuan Engineering Lab of Non-metallic Mineral Powder Modification and High-value Utilization Mianyang621010China School of Architecture and Civil Engineering Chengdu UniversityChengdu610106China

Based on the co.position characteristics of carbide slag and the application of polyvinyl chloride,a method of preparing calcium carbonate with microstructure and nanostructure by using carbide slag as a raw material and ammonium chloride as a leaching agent was *** factors for the preparation of calcium carbonate and the effects of different co.ditions on the crystal phase,grain size,and morphology of calcium carbonate were systematically *** results showed that the nanosized calcium carbonate was prepared at 60 mL/min,25°C,no additional ammonia,and 60 *** product of spherical vaterite was in acco.dance with the relevant standards for the industrial precipitation of calcium ***,the reuse of carbonation filtrate was *** crystal phase,grain size,and morphology of the carbonation product co.ld be co.trolled by adjusting the reaction *** manuscript provided a new idea for resource utilization of carbide slag and preparing nanocalcium carbonate.

关键词： Carbide slag Ammonium chloride Cyclic utilization Micro and nano structure Product co.trol

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Effect of iron ion co.figurations on Ni^(2+) removal in electroco.gulation

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Journal of Environmental Sciences 2023年第2期124卷 823-834页

作者： Xiaoliu Lü Tao Xu Yihui Zhou Qingjuan Peng Jinhua Ou Bonian Hu Zhihui Xie Xiping Lei Gang Yu co.lege of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China Research Institute of new building materials Hunan Institute of TechnologyHengyang 421008China Chemical Synthesis and Pollution co.trol Key Laboratory of sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China Hunan Zihong Eco.ogy Technology co. Ltd.Changsha 410000China

Electroco.gulation(EC)has been widely used to treat the heavymetal wastewater in industry.A novel process of sinusoidal alternating current electroco.gulation(SACC)is adopted to remove Ni2+in wastewater in this *** morphology of precipitates and the distribution of the main functional iron co.figurations were *** timed co.plex spectrosco.y can identify the monomeric iron co.figurations[Fe(a)],oligomeric iron co.figurations[Fe(b)]and polymeric iron co.figurations[Fe(c)].The optimal operating co.ditions of SACC process were determined through single-factor *** maximum Ni2+removal efficiency[Re(Ni^(2+))]was achieved under the co.ditions of pH0=7,current density(j)=7 A/m^(2),electrolysis time(t)=25 min,c0(Ni^(2+))=100 mg/*** pH=7,the proportion of Fe(b)and Fe(c)in the system was 50.4 at.% and 23.1 at.%,*** the SACC process,Fe(b)and Fe(c)are themain iron co.figurations in solution,while Fe(c)are the vastmajority of the iron co.figurations in the direct current electroco.gulation(DCC)***(Ni2+)is 99.56% for SACC and 98.75% for DCC under the same optimum co.ditions,*** precipitates produced by SACC have a high proportion of Fe(b)co.figurations with sphericalα-FeOOH andγ-FeOOH structures which co.tain abundant hydroxyl ***,it is demonstrated that Fe(b)has better adsorption capacity than Fe(c)through adsorption experiments of methyl orange(MO)***(a)co.figurations in the homogeneous solution had no effect on the removal of nickel.

关键词： Electroco.gulation Nickel wastewater Iron co.figurations Alternating current Polynuclear iron-hydroxyl co.plex

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co.trolled synthesis and closed-loop chemical recycling of biodegradable co.olymers with co.position-dependent properties

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Science China Chemistry 2022年第5期65卷 943-953页

作者： Yi-Teng Yan Gang Wu Si-Chong Chen Yu-Zhong Wang The co.laborative Innovation Center for Eco.Friendly and Fire-Safety Polymeric materials(MoE) National Engineering Laboratory ofEco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

The closed-loop recycling co.cept of the polymer wastes into building-block chemicals is attractive,but the closed-loop recycling of co.olymers enabled by energy-efficient chemical recycling and co.t-effective separations is still facing great ***,for the first time,a one-pot sequential co.olymerization of γ-butyrolactone(γ-BL) and p-dioxanone(PDO)using an eco.omical ureas/alkoxides catalytic system is co.ducted to synthesize biodegradable and chemically recyclable poly-(γ-butyrolactone)-block-poly(p-dioxanone)(PγBL-b-PPDO) diblock co.olymers with well-defined and co.trolled *** co.position-dependent properties of PγBL-b-PPDO co.olymers,including thermal properties and crystallization behavior,are *** results show that the thermal stability and crystalline ability of PγBL are enhanced observably by introducing the PPDO ***,the PγBL-b-PPDO co.olymers can be depolymerized efficiently into the co.responding co.monomers with a yield of over 95% by simply low-temperature pyrolysis under ***,γ-BL and PDO monomers are selectively separated with an isolated purity of about 99% based on the difference in their physico.hemical ***,their repolymerization is realized to obtain the co.olymers with nearly identical structures and thermostability,demonstrating the closed-loop recycling of co.olymers,i.e.,*** research provides important guidance for the design of novel sustainable polymers towards more efficient chemical recycling,separation and regeneration.

关键词： biodegradable co.olyester poly(p-dioxanone) tunable properties closed-loop chemical recycling

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Fractional derivative statistical damage model of unsaturated expansive soil based on unified hydraulic effect

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山地科学学报(英文) 2023年第9期20卷 2769-2782页

作者： ZHANG Hua WANG Peng School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China sichuan Provincial Engineering Research Center of City Solid Waste Energy and building materials co.version and Utilization Technology Chengdu UniversityChengdu 610106China Geotechnical Engineering Institute Sichuan Institute of Building ResearchChengdu 610081China sichuan Engineering Research Center for Mechanical Properties and Engineering Technology of Unsaturated Soils Chengdu UniversityChengdu 610106China

Unsaturated expansive soil is widely distributed in China and has co.plex engineering *** paper proposes the unified hydraulic effect shear strength theory of unsaturated expansive soil based on the effective stress principle,swelling force principle,and soil–water *** the visco.lasticity and structural damage of unsaturated expansive soil during loading,a fractional hardening–damage model of unsaturated expansive soil was *** model parameters were established on the basis of the proposed calculation method of shear strength and the triaxial shear experiment on unsaturated expansive *** proposed model was verified by the experimental data and a traditional damage *** proposed model can satisfactorily describe the entire process of the strain-hardening law of unsaturated expansive ***,by investigating the damage variables of the proposed model,it was found that:(a)when the values of co.fining pressure and matric suction are close,the co.pling of co.fining pressure and matric suction co.tributes more to the shear strength;(b)there is a damage threshold for unsaturated expansive soil,and is mainly reflected by strength criterion of infinitesimal body;(c)the strain hardening law of unsaturated expansive soil is mainly reflected by fractional derivative operator.

关键词： Unsaturated expansive soil Unified hydraulic effect Shear strength theory Hardening-damage model Fractional derivative

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Novel method for improving iron reco.ery from electric arc furnace slag: on-site hot modification

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Journal of Iron and Steel Research International 2022年第8期29卷 1224-1235页

作者： Xiang Lu Xiao-li Huang Ru-fei Wei Wen Chen Da-qiang Cang Fei-hua Yang Chun-lei Pu Changsha Research Institute of Mining&Metallurgy co. Ltd.Changsha 410012HunanChina School of Metallurgy and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China Technological Institute of Development and Strategy Studies Panzhihua 617000SichuanChina School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243000AnhuiChina State Key Laboratory of Solid Waste Reuse for building materials(SKL-SWR) Beijing Building Materials Academy of Sciences Research(BBMA)Beijing 100083China Iron and Steel Technology Research Institute HUATIAN Engineering&Technology CorporationMCCNanjing 210019JiangsuChina

The iron element in electric arc furnace(EAF)slag is extremely difficult to recycle due to the low specific magnetic susceptibility of the RO phase(a solid solution of FeO,MgO,CaO,and MnO).Landfilling EAF slag is strictly forbidden for environmental co.sideration because of poisonous Cr^(6+) *** original RO phase co.ld be transformed to a spinel structure,whose specific magnetic susceptibility is much higher than that of other minerals,through hot modification,resulting in significantly increased iron reco.ery by magnetic *** of spinel crystals encloses chromium,such that iron and chromium co.ld be reco.ered *** chromium in obtained iron co.centrates is co.siderably useful for stainless steel making rather than polluting the *** a result,reco.ering iron and chromium is truly beneficial for cleaner *** modification of EAF slag should be co.ducted at 1500-1600ºC for at least 60 min to guarantee homogeneous liquid *** liquid slag was poured onto an iron mold to obtain modified slag(MS)through air *** was characterized by thermodynamic analysis,X-ray diffraction,and scanning electron microsco.y co.bined with energy-dispersive spectrosco.y to co.relate the relationship between mineral structures and iron *** iron reco.ery rate of MS first increased and then decreased with increasing *** was less than 10%when the modifier addition amount was below 12 wt.%,but it increased rapidly as the modifier addition amount increased from 16 to 24 wt.%,mainly due to spinel *** highest iron reco.ery rate was 81.9%when the modifier amount reached 20 wt.%.Meanwhile,Cr^(6+) was enriched in the spinel phase but was not observed in other *** tests were performed on-site with the modifier ranging from 12 to 18 wt.%because additional heat was not provided during the *** showed that MS with 18 wt.%modifier addition exhibited an iron reco.ery rate of 61.0%,much h

关键词： EAF slag On-site hot modification Iron reco.ery Chromium reco.ery Spinel Industrial test

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A Strain Rate Dependent co.stitutive Model for the Lower Silurian Longmaxi Formation Shale in the Fuling Gas Field of the sichuan Basin,China

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 972-981页

作者： HOU Zhenkun LI Xianwen ZHANG Yanming LIANG Huqing GUO Ying CHENG Hanlie GAO Ruchao Guangzhou Institute of building Science co. Ltd.Guangzhou 510440China School of materials Science and Engineering South China University of TechnologyGuangzhou 510640China Oil and Gas Technology Research Institute Changqing Oilfield Branch Company of PetroChinaXi’an 710018China Institute of Geology and Paleontology Linyi UniversityLinyi 276000ShandongChina LandOcean Energy Services co. Ltd.Beijing 100084China CCCC Seco.d Harbour Engineering co. Ltd.Wuhan 430040China

Shale,as a kind of brittle rock,often exhibits different nonlinear stress-strain behavior,failure and timedependent behavior under different strain *** capture these features,this work co.ducted triaxial co.pression tests under axial strain rates ranging from 5×10-6 s-1 to 1×10-3 *** results show that both elastic modulus and peak strength have a positive co.relation relationship with strain *** strain rate-dependent mechanical behaviors of shale are originated from damage growth,which is described by a damage *** axial strain is the same,the damage parameter is positively co.related with strain *** strain rate is the same,with an increase of axial strain,the damage parameter decreases firstly from an initial value(about 0.1 to 0.2),soon reaches its minimum(about 0.1),and then increases to an asymptotic value of *** on the experimental results,taking yield stress as the cut-off point and co.sidering damage variable evolution,a new measure of micro-mechanical strength is *** on the Lemaitre’s equivalent strain assumption and the new measure of micro-mechanical strength,a statistical strain-rate dependent damage co.stitutive model for shale that co.ples physically meaningful model parameters was *** back-calculations of these triaxial co.pression tests results demonstrate the ability of the model to reproduce the primary features of the strain rate dependent mechanical behavior of shale.

关键词： strain rates triaxial co.pression tests damage variable co.stitutive model Longmaxi Formation shale

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