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Formation of multifunctional Fe_3O_4/Au composite nanoparticles for dual-mode MR/CT imaging applications

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Chinese Physics B 2014年第7期23卷 22-29页

作者：胡勇李静超沈明武史向阳 College of Chemistry Chemical Engineering and BiotechnologyDonghua University

Recent advances with iron oxide/gold （Fe3O4/Au） composite nanoparticles （CNPs） in dual-modality magnetic reso- nance （MR） and computed tomography （CT） imaging applications are reviewed. The synthesis and assembly of＂dumbbell- like＂ and ＂core/shell＂ FeaO4/Au CNPs is introduced. Potential applications of some developed Fe3O4/Au CNPs as contrast agents for dual-mode MR/CT imaging applications are described in detail.

关键词： iron oxide nanoparticles gold nanoparticles magnetic resonance imaging computed tomographyimaging

Boron heteroatom-doped silicon-carbon peanut-like composites enables long life lithium-ion batteries

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Rare Metals 2022年第4期41卷 1276-1283页

作者： Fang-Zhou Zhang Yuan-Yuan Ma Miao-Miao Jiang Wei Luo Jian-Ping Yang State Key Laboratory for Modification of chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Carbon coated Si core–shell structures have been proposed to solve the adverse effects of Si-based ***,designing ideal core–shell architecture with excellent surface and interface properties is still a significant ***,a novel peanut-like structure of B-doped silicon/carbon nanoparticle(Si@B-C)synthe-sized by sol–gel process and subsequent thermal reduction is *** peanut-like Si@B-C electrode demon-strates a superior cyclability of 534 mAh·g^(-1)after 1000 cycles at high current density of 1000 mA·g^(-1).The exceptional electrochemical performance is attributed to the boric acid-induced highly interconnected peanut-like structure and boron heteroatom framework could provide a continuous electron pathway to reduce the irreversible lithium ion loss during rapid *** work provides insight into the development of the heteroatom-doped Si-based anodes with stable cycling performance for LIBs.

关键词： Lithium-ion battery Silicon anode Peanutlike structure Boron doping Long cycle life

Formation and evolution mechanisms of large-clusters during rapid solidification process of liquid metal Al

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Science China(Physics,Mechanics & Astronomy) 2005年第1期48卷 101-112页

作者： LIU Rangsu, DONG Kejun, LIU Fengxiang, ZHENG Caixing, LIU Hairong & LI Jiyong Department of Applied Physics, Hunan university, Changsha 410082, China College of Materials Science and engineering, Hunan university, Changsha 410082, China College of Chemistry and chemical engineering, Hunan university, Changsha 410082, China Department of Applied Physics Hunan University Changsha 410082 China College of Materials Science and engineering Hunan University Changsha 410082 China College of Chemistry and chemical engineering Hunan University Changsha 410082 China

A molecular dynamics simulation study has been performed for the formation and evolution characteristics of nano-clusters in a large-scale system consisting of 400000 atoms of liquid metal Al. The center-atom method combined with pair-bond analysis technique and cluster-type index method (CTIM) has been applied here to describe the structural configurations of various basic clusters. It is demonstrated that both the 1551 bond-type and the icosahedral cluster (12 0 12 0) constructed by 1551 bond-types are dominant among all the bond-types and cluster-types, respectively, in the system and play a critical role in the microstructure transitions of liquid metal Al. The nano-clusters (containing up to 150 atoms) are formed by the combination of some middle and small clusters with distinctly different sizes, through mutual competition by unceasing annex and evolution in a seesaw manner (in turn of obtaining and losing),which do not occur as the multi-shell structures accumulated with an atom as the center and the surrounding atoms are arranged according to a certain rule. This is the essential distinction of nano-cluster in liquid metal from those obtained by gaseous deposition, ionic spray methods, and so on. Though the nano-clusters differ from each other in shape and size, all of them possess protruding corners that could become the starting points of various dendrite structures in the solidification processes of liquid metals.

关键词： liquid metal, solidification process, large-cluster configuration, evolution mechanism, computer simulation.

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

Yolk-shell structured Fe@void@mesoporous silica with high magnetization for activating peroxymonosulfate

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Chinese chemical Letters 2020年第7期31卷 2003-2006页

作者： Bingqian Xu Wan Jiang Lianjun Wang Binota Thokchom Pengpeng Qiu Wei Luo State Key Laboratory for Modification of chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Indian Institute of Technology Guwahati Guwahati 781039India

Sulfate radical anion(SO4*)based Fenton-like reaction have recently received a large quantity of attention owing to their strong oxidative capacity and high selectivity toward organic ***,the development of a high-efficient catalyst for activation of peroxymonosulfate(PMS)with a fast separation is still ***,magnetic mesoporous silica composites with a yolk-shell structure(Fe@void@mSiO2)have been prepared via a successive coating strategy,followed by a hightemperature in-situ treatment and demonstrated as a high-efficient and fast magnetic separable catalyst for the activation of *** resultant material possesses a well-defined yolk-shell structure with high specific surface area(~495.0 m^2/g),uniform pore size(~6.9 nm)and super large magnetic susceptibility(~105 emu/g).Owing to the unique properties,the material possesses an excellent degradation activity for tetracyclines(TC),which is much higher than the commercialized Zero Valent Iron(ZVI)***,the catalyst is able to work over a broad pH range and be quickly recycled by using an external magnetic *** research provides a promising strategy for the synthesis and design of multifunctional catalyst for the Fenton-like process.

关键词： Yolk-shell Magnetic mesoporous silica Fenton-like process PMS activation Tetracyclines

Stretchable electrothermochromic fibers based on hierarchical porous structures with electrically conductive dual-pathways

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Science China Materials 2020年第12期63卷 2582-2589页

作者： Hongwei Fan Qiang Li Kerui Li Chengyi Hou Qinghong Zhang Yaogang Li Hongzhi Wang State Key Laboratory for Modification of chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of chemical and Biomolecular engineering National University of SingaporeSingapore 117585Singapore engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China

Stretchable color-changing fibers are urgently demanded for smart textiles/clothing due to their perfect implantability,permeability of vapor and heat,and flexibility/***,stretchable electrothermochromic fibers were fabricated with unconventional stretchable conductive fibers as core layers and thermochromic coatings as shell *** the stretchable conductive fibers,hierarchical porous structures with percolative one-dimensional(1 D)conductive networks were constructed through phase inversion of carbon nanotube/polyurethane(CNT/PU)*** the deposition of silver nanoparticles(AgN Ps)on the surface of micro-pores,electrically conductive dual-pathways consisting of0 D AgN Ps and 1 D CNTs were formed to significantly enhance the electric conductivity and thus improve the electrothermal performance of the *** importantly,because of the connective CNTs and AgN Ps,such dual-pathways ensured the electron transport under the stretching state,preventing the sharp decay of conductivity and electrothermal *** the continuous wet-spinning method,the stretchable conductive fibers can be easily obtained with the length up to several *** last,stretchable electrothermochromic fibers were prepared with two color-changing modes and implanted into textile perfectly,advancing their applications in wearable display and military adaptive camouflage of smart clothing.

关键词： hierarchical porous structures conductive dual-pathways stretchable conductive fibers electrothermochromic fibers smart clothing

Stepwise construction of Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and magnetic separability for efficient visible-light photocatalysis

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Chinese chemical Letters 2020年第6期31卷 1598-1602页

作者： Zhijian Li Yao Wang Ahmed A.Elzatahry Xuanyu Yang Shouzhi Pu Wei Luo Xiaowei Cheng Yonghui Deng Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEMFudan University.Shanghai 200433China Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China Materials Science and Technology Program College of Arts and SciencesQatar UniversityDoha PO Box 2713Qatar State Key Laboratory for Modification of chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Solid photocatalysts with high specific surface area,superior photoactivity and ease of recycling are highly desired in chemical process,water treatment and so *** this study,a facile stepwise sol-gel coating approach was utilized to synthesize Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and convenient magnetic separability(denoted as Fe3 O4@-SiO2@Pt/mTiO2-x).These photocatalysts consist of magnetic Fe3 O4 cores,nonporous insulating SiO2 middle layer and mesoporous anatase TiO2-x shell decorated by Pt nanoparticles(~3.5 nm)through wet impregnation and H2 *** a result of high activity of oxygen-deficiency of black TiO2-x by H2 reduction and efficient inhibition of electron-hole recombination by Pt nanoparticles,the rationally designed core-shell Fe3 O4@SiO2@Pt/mTiO2-x photocatalysts exhibit superior photocatalytic performance in rhodamine B(RhB)degradation under visible light irradiation,with more than 98%of RhB degraded within 50 *** core-shell structured photocatalysts show excellent recyclability under the assistance of magnetic separation with well-retained photocatalytic performance even after running five *** stepwise synthesis method paves the way for the rational design of a high-efficiency recyclable heterogeneous catalyst,including photocatalysts,for various applications.

关键词： Core-shell Mesoporous TiO2 Photocatalytic activity Magnetic recovery Visible light

Rational synthesis of carbon shell coated polyaniline/ MoS2 monolayer composites for high-performance supercapacitors

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Nano Research 2016年第4期9卷 951-962页

作者： Chao Yang Zhongxin Chen Imran Shakir Yuxi Xu Hongbin Lu State Key Laboratory of Molecular engineering of Polymers Department of Macromolecular Science Collaborative Innovation Center of Polymers and Polymer Composite Materials Fudan University Shanghai 200433 China Sustainable Energy Technologies (SET) center College of engineering King Saud University PO-BOX 800 Riyadh 11421 Kingdom of Saudi Arabia

Conducting polymers generally show high specific capacitance but suffer from poor rate capability and rapid capacitance decary which greatly limits their practical applications in supercapacitor electrodes. To this end, many studies have focused on improving the overall capacitive performance by synthesizing nanostructured conducting polymers or by depositing a range of coatings to increase the active surface area exposed to the electrolyte and enhance the charge transport efficiency and structural stability. Despite this, simultaneously achieving high specific capacitance, good rate performance, and long cycle life remains a considerable challenge. Among the various two-dimensional （2D） layered materials, octahedral （1T） phase molybdenum disulfide （MoS2） nano- sheets have high electrical conductivity, large specific surface areas, and unique surface chemical characteristics, making them an interesting substrate for the controlled growth of nanostructured conducting polymers. This paper reports the rational synthesis of carbon shell-coated polyaniline （PANI） grown on 1T MoS2 monolayers （MoS2/PANI@C）. The composite electrode comprised of MoS2/ PANI@C with a -3 nm carbon shell exhibited a remarkable specific capacitance of up to 678 F-g-1 （1 mV.s-1）, superior capacity retention of 80% after 10,000 cycles and good rate performance （81% at 10 mV.s-1） due to the multiple synergic effects between the PANI nanostructure and 1T MoS2 substrates as well as protection by the uniform thin carbon shell. These properties are comparable to the best overall capacitive performance achieved for conducting polymers-based supercapacitor electrodes reported thus far.

关键词： supercapadtor polyaniline molybdenum disulfide carbon shell cycle stability

Surface-oxidation-mediated construction of Ppy@VNO/NG core-shell host targeting highly capacitive and durable negative electrode for supercapacitors

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Science China Materials 2021年第9期64卷 2148-2162页

作者： Wei Sun Guohua Gao Guangming Wu Zhengwei You State Key Laboratory for Modification of chemical Fibers and Polymer Materials Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-dimension Materials(Donghua University)College of Materials Science and EngineeringDonghua UniveristyShanghai 201620China Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Molecular engineering of Polymers Fudan UniversityShanghai 200433China

Vanadium nitride(VN)-based materials have been investigated as negative electrode materials for supercapacitors(SCs)owing to their high theoretical capacitances and suitable negative potential ***,viable VNbased negative electrode materials suffer from irreversible electrochemical oxidation of the soluble vanadium species,leading to rapid capacitance fading when operated in aqueous *** a versatile approach to enhance the stability of VN in aqueous electrolytes is still a ***,an interface engineering strategy is developed to intentionally introduce surface nanolayers of vanadium oxides(VO_(x))as a reactive template on the VN surface to formulate welldesigned polypyrrole@VNO(Ppy@VNO)core-shell nanowires(NWs)incorporated into a 3D porous N-doped graphene(NG)hybrid aerogel as a durable negative electrode for *** and theoretical investigations reveal that the in-situ constructed Ppy@VNO core-shell host can offer more efficient pathways for rapid electron/ion transport and accessible electroactive *** importantly,a reversible surface redox reaction is realized through the transformation of the valence state of V,and a long cyclic stability is *** Ppy@VNO/NG hybrid aerogel can deliver a high specific capacitance of 650 F g^(-1) at 1 A g^(-1) with approximately 70.7%capacitance retention(up to the twenty-fold current density),and an excellent cycling stability without any capacitance decay after 10,000 cycles at both low and high current densities(1 and 10 A g^(-1),respectively).This work paves the way for the development of advanced electrode materials for SCs.

关键词： VN-based negative electrode materials interface engineering core-shell nanostructure valence state transformation long-term cycling stability