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Nano Research 2023年第5期16卷 6057-6066页

作者： Man Zhao Xiaoru Cheng He Xiao Jianru Gao Shoufeng Xue Xiaoxia Wang Haishun Wu Jianfeng Jia Nianjun Yang Key Laboratory of Magnetic Molecules&Magnetic Information Materials Ministry of Education The School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030000China Institute of Materials Engineering University of SiegenSiegen 57076Germany

Highly active,stable,and cut-price(photo-)electrocatalysts are desired to overwhelm high energy barriers for anodic oxygen evolution reaction ***,a heterostructure of cobalt-iron oxide/black phosphorus nanosheets is in-situ synthesized via a facile and novel three-electrode electrolysis *** black phosphorus is exfoliated into its nanosheets at the cathode while the CoFe oxide is derived directly from the metal wire anode during the electrolysis *** heterostructure exhibits excellent electrocatalytic oxygen evolution reaction(OER)performance,and the overpotential at 10 mA·cm^(−2)is 51 mV lower than that of the commercial RuO_(2)*** superior OER performance stems from the favorable adsorption behavior and an enlarged electrochemical active surface area of the *** reveal the origin of excellent OER performance from the point of adsorption strength of OH*,methanol oxidation reaction(MOR)test is applied under the identified OER operating *** introduction of light illumination enhances the OER activity of this *** overpotential drops down to 280 mV,benefiting from pronounced photochemical response of black phosphorus nanosheets and iron oxide inside the *** work develops a new electrochemical method to construct high performance and light-sensitive heterostructures from black phosphorus nanosheets for the OER.

关键词： electrosynthesis oxygen evolution reaction black phosphorus cobalt oxide iron oxide

Ferritin surplus in mouse spleen 14 months after intravenous injection of iron oxide nanoparticles at clinical dose

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Nano Research 2016年第8期9卷 2398-2410页

作者： Alexandre Tamion Matthias Hillenkamp Arnaud Hillion Valentin A. Maraloiu Ioana D. Vlaicu Mariana Stefan Daniela Ghica Hugo Rositi Fabien Chauveau Marie-Genevieve Blanchin Marlene Wiart Veronique Dupuis Institut Lumiere Matiere UMR5306 Universite Lyon 1- CNRS Universite de Lyon 69622 Villeurbanne cedex France National Institute of Materials Physics 105bis AtomistilorSt. R-077125 Bucharest-Magurele Romania CNRS UMR 5220 INSERM U1044 INSA de Lyon Universite de Lyon Lyon 1 CREATIS 69003 Lyon France CRNL-BIORAN CNRS UMR5292 INSERM U 1028 Universite Lyon 1 59 BD PINEL 69677 Bron France

In this study, we followed the biodegradation of ultra-small superparamagnetic iron oxide nanoparticles injected intravenously at clinical doses in mice. An advanced fitting procedure for magnetic susceptibility curves and low- temperature hysteresis loops was used to fully characterize the magnetic size distribution as well as the magnetic anisotropy energy of the injected P904 nano- particles （Guerbet Laboratory）. Additional magnetometry measurements and transmission electronic microscopy observations were systematically performed to examine dehydrated samples from the spleen and liver of healthy C57B16 mice after nanoparticle injection, with sacrifice of the mice for up to 14 months. At 3 months after injection, the magnetic properties of the spleen and liver were dramatically different. While the liver showed no magnetic signals other than those also present in the reference species, the spleen showed an increased magnetic signal attributed to ferritin. This surplus of ferritin remained constant up to 14 months after injection.

关键词： nanoparticles biodegradation iron oxide nanomagnetism contrast agent

Hydrogen-based direct reduction of iron oxide at 700℃:Heterogeneity at pellet and microstructure scales

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International Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1901-1907页

作者： Yan Ma Isnaldi R.Souza Filho Xue Zhang Supriya Nandy Pere Barriobero-Vila Guillermo Requena Dirk Vogel Michael Rohwerder Dirk Ponge Hauke Springer Dierk Raabe Max-Planck-Institut für Eisenforschung Max-Planck-Straße 140237 DüsseldorfGermany Corrosion Center Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Institute of Materials Research German Aerospace Center(DLR)Linder Höhe51147 CologneGermany Lehr-und Forschungsgebiet Metallische Strukturen und Werkstoffsysteme für die Luft-und Raumfahrt RWTH Aachen University52062 AachenGermany Institut für Bildsame Formgebung RWTH Aachen UniversityIntzestraße 1052072 AachenGermany

Steel production causes a third of all industrial CO_(2) emissions due to the use of carbon-based substances as reductants for iron ores,making it a key driver of global ***,research efforts aim to replace these reductants with sustainably produced ***-based direct reduction(HyDR)is an attractive processing technology,given that direct reduction(DR)furnaces are routinely operated in the steel industry but with CH_(4) or CO as *** diffuses considerably faster through shaft-furnace pellet agglomerates than carbon-based ***,the net reduction kinetics in HyDR remains extremely sluggish for high-quantity steel production,and the hydrogen consumption exceeds the stoichiometrically required amount ***,the present study focused on the improved understanding of the influence of spatial gradients,morphology,and internal microstructures of ore pellets on reduction efficiency and metallization during *** this purpose,commercial DR pellets were investigated using synchrotron high-energy X-ray diffraction and electron microscopy in conjunction with electron backscatter diffraction and chemical *** the interplay of different phases with internal interfaces,free surfaces,and associated nucleation and growth mechanisms provides a basis for developing tailored ore pellets that are highly suited for a fast and efficient HyDR.

关键词： hydrogen-based direct reduction iron oxide microstructure spatial gradient metallization

Thermal Growth and Nanomagnetism of the Quasi-one Dimensional iron oxide

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Journal of Materials Science & Technology 2011年第11期27卷 985-990页

作者： Minglong Zhong Zhongwu Liu Xichun Zhong Hongya Yu Dechang Zeng School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China

Quasi-one dimensional iron oxide nanowires with flat needle shape were synthesized on the iron powders by a rather simple catalyst-free thermal oxidation process in ambient atmosphere. The characterization by field emission scanning electron microscopy （FE-SEM）, X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, Raman and high-resolution transmission electron microscopy （HRTEM） revealed that these nanos- tructures are single crystalline α-Fe2O3. The various dimensions with 40-170 nm in width and 1-8 μm in length were obtained by tuning the growth temperature from 280 to 480℃. A surface diffusion mechanism was proposed to account for the growth of quasi-one dimensional nanostructure. The typical α-Fe203 nanowires synthesized at 430℃ had a reduced Morin temperature TM of 131 K in comparison with their bulk counterpart. The coercivitis Hc of these nanowires are 321 and 65 Oe at 5 and 300 K, respectively. The temperature of synthesis also has important effects on the magnetic properties of these nanowires.

关键词： Thermal growth One-dimensional nanostructures iron oxide Magnetic materials

Reduced graphene oxide supersonically sprayed on wearable fabric and decorated with iron oxide for supercapacitor applications

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Journal of Materials Science & Technology 2021年第23期82卷 47-56页

作者： Ali Aldalbahi Edmund Samuel Bander S.Alotaibi Hany El-Hamshary Sam S.Yoon Department of Chemistry College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia School of Mechanical Engineering Korea UniversitySeoul136-713Republic of Korea

We demonstrate the fabrication of wearable supercapacitor *** electrodes were applied to wearable fabric by supersonically spraying the fabric with reduced graphene oxide(r GO)followed by decoration with iron oxide(Fe_(2)O_(3))nanoparticles via a hydrothermal *** integration of iron oxide with r GO flakes on wearable fabric demonstrates immense potential for applications in high-energystorage *** synergetic impact of the intermingled r GO flakes and Fe_(2)O_(3) nanoparticles enhances the charge transport within the composite electrode,ultimately improving the overall electrochemical *** advantage of the porous nature of the fabric,electrolyte diffusion into the active r GO and Fe_(2)O_(3) materials was significantly enhanced and subsequently increased the electrochemical interfacial *** effect of the Fe_(2)O_(3) concentration on the overall electrochemical performance was *** optimal composition yields a specific capacitance of 360 F g^(-1) at a current density of 1 Ag^(-1) with a capacitance retention rate of 89%after 8500 galvanostatic cycles,confirming the long-term stability of the Fe_(2)O_(3)/r GO fabric electrode.

关键词： Supersonic spraying Conductive textile Wearable energy devices Reduced graphene oxide iron oxide Supercapacitor

Real time imaging of two-dimensional iron oxide spherulite nanostructure formation

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Nano Research 2019年第11期12卷 2889-2893页

作者： Wenjing Zheng Matthew R.Hauwiller Wen-I Liang Colin Ophus Peter Ercius Emory M.Chan Ying-Hao Chu Mark Asta Xiwen Du A.Paul Alivisatos Haimei Zheng Institute of New-Energy Materials School of Materials Science and EngineeringTianjin UniversityTianjin300350China Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Department of Chemistry University of CaliforniaBerkeleyBerkeleyCA94720USA Department of Materials Science and Engineering “National Chiao Tung University”Hsinchu30010TaiwanChina The Molecular Foundry Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Department of Materials Science and Engineering University of CaliforniaBerkeleyBerkeleyCA94720USA Kavli Energy NanoScience Institute University of California-Berkeley and Lawrence Berkeley National LaboratoryBerkeleyCA94720USA

The formation of complex hierarchical nanostructures has attracted a lot of attention from both the fundamental science and potential applications point of *** structures with radial fibrillar branches have been found in various solids;however,their growth mechanisms remain poorly ***,we report real time imaging of the formation of two-dimensional(2D)iron oxide spherulite nanostructures in a liquid cell using transmission electron microscopy(TEM).By tracking the growth trajectories,we show the characteristics of the reaction front and growth *** observations reveal that the tip of a growing branch splits as the width exceeds certain sizes(5.5–8.5 nm).The radius of a spherulite nanostructure increases linearly with time at the early stage,transitioning to nonlinear growth at the later ***,a thin layer of solid is accumulated at the tip and nanoparticles from secondary nucleation also appear at the growing front which later develop into fibrillar *** spherulite nanostructure is polycrystalline with the co-existence of ferrihydrite and Fe3O4 through-out the growth.A growth model is further established,which provides rational explanations on the linear growth at the early stage and the nonlinearity at the later stage of growth.

关键词： liquid cell transmission electron microscopy(TEM) in situ TEM iron oxide spherulite nanostructures

Dextran-modified iron oxide nanoparticles

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China Particuology 2007年第1期5卷 162-168页

作者： Jií Hradil Alexander Pisarev Michal Babi Daniel Hork Institute of Macromolecular Chemistry Academy of Sciences of the Czech Republic Heyrovsky Sq. 2 162 06 Prague Czech Republic

Dextran-modified iron oxide nanoparticles were prepared by precipitation of Fe（Ⅱ） and Fe（Ⅲ） salts with ammonium hydroxide by two methods. iron oxide was precipitated either in the presence of dextran solution, or the dextran solution was added after precipitation. In the second method, the iron oxide particle size and size distribution could be controlled depending on the concentration of dextran in the solution. The nanoparticles were characterized by size-exclusion chromatography, transmission electron microscopy and dynamic light scattering. Optimal conditions for preparation of stable iron oxide colloid particles were determined, The dextran/iron oxide ratio 0-0,16 used in precipitation of iron salts can be recommended for synthesis of nanoparticles suitable for biomedical applications, as the colloid does not contain excess dextran and does not coagulate.

关键词： iron oxide Nanoparticles Dextran Size-exclusion chromatography Particle size

Phase transformation and shape evolution of iron oxide nanocrystals synthesized in the ethylene glycol-water system

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Science China(Physics,Mechanics & Astronomy) 2011年第7期54卷 1271-1276页

作者： LIU RongZheng ZHAO YuZhen HUANG RongXia ZHAO YongJie ZHOU HePing State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

iron oxide particles with various shapes,sizes and phase concentrations(including--Fe2O3 and Fe3O4) have been synthesized through a simple hydrothermal method in the ethylene glycol(EG)-water *** the preparation conditions,ferric chloride(FeCl3.6H2O) was used as the iron source in the presence of sodium hydroxide(NaOH) without any *** adjusting the experimental parameters(EG/H2O ratio,base content,iron ions concentration,etc.),the shape,the size,the phase and the magnetic property of the products could be easily *** products were characterized by using X-ray diffraction(XRD),scanning electron microscopy(SEM),and a vibrating sample magnetometer(VSM).A further investigation revealed that high EG content and high alkaline condition favored the formation of Fe3O4 phase.A possible growth mechanism was proposed based on the experimental *** magnetic properties were deeply affected by the morphology and phase of the as-synthesized *** controlled shape,size and phase structure of the iron oxides through simple synthetic procedures provides potential opportunities to realize the promising size and shape-dependent applications.

关键词： iron oxide shape size phase transformation magnetic property

Effects of Catalyst and Additive Containing Li, Na, or Ca on Reduction of iron oxide/Carbon Composite Pellets

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Journal of University of Science and Technology Beijing 2001年第3期8卷 185-188页

作者： Xingmin Guo, Shengbi Zhang, Nianxin Fu, Xiaofeng Zhao Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China Northeastern University, Shenyang 110006, China Anshan iron and Steel (Group) Company, Anshan 114021, China Metallurgy School Univ. of Sci. and Technol. Beijing Beijing 100083 China

The catalyst containing 0.69% (mass fraction) of Li+, Na+, or Ca2+ were synthesized, and the catalytic effect on the reduction of iron oxide/carbon composite pellets were investigated by comparing with that of additive at 850 degreesC. The effect of the catalyst was greater than that of the additive, it can be considered that catalyst promoted the formation of iron nucleus early on reduction processes of iron oxide/carbon composite pellets. In addition, both effects of catalyst and additive increased after added carbon powder into the pellets, but the extent of increase decreased when the carbon powder exceeded a suitable content (about 4%), this amount is less than that of carbon needed theoretically on the reduction from hematite to iron.

关键词： iron oxide carbon reduction catalyst pellets additive

Synthesis of iron oxide cubes/reduced graphene oxide composite and its enhanced lithium storage performance

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Chinese Chemical Letters 2021年第1期32卷 113-118页

作者： Chenran Hao Tiange Gao Anbao Yuan Jiaqiang Xu NEST Lab Department of ChemistryCollege of SciencesShanghai UniversityShanghai 200444 China

Fe_(3)O_(4) is considered as a promising electrode material for lithium-ion batteries(LIBs) due to its low cost and high theoretical capacity(928 mAh/g).Nevertheless,the huge volume expansion and poor conductivity seriously hamper its practical *** this study,we use a facile hydrothermal reaction together with a post heat treatment to construct the three-dimensional heterostructured composite(Fe_(3)O_(4)/rGO) inwhich reduced graphene oxide sheets wraped the Fe_(3)O_(4) submicron cubes as the conductive *** electric conduction and electrode kinetics of lithium ion insertion/extraction reaction of the composite is enhanced due to the assist of conductive rGO,and thus the Listorage performance is obviously *** composite exhibits a reversible charge capacity of772.1 mAh/g at the current density of 0.1 A/g,and the capacity retention reaches 70.3% after400 cycles at0.5 A/g,demonstrating obviously higher specific capacity and rate capability over the Fe_(3)O_(4) submicron cubes without rGO,and much superior cycling stability to the parent Fe_2 O_3 submicron cubes without *** the other hand,as a synergic conductive carbon support,the flexible rGO plays an important role in buffering the large volume change during the repeated discharge/charge cycling.

关键词： iron oxide Reduced graphene oxide Composite Lithium ion battery Anod