In Situ Imaging of Field-Induced Hexagonal Columns in Magnetite Ferrofluids

Mark Klokkenburg; Ben H. Erne; Johannes D. Meeldijk; Albrecht Wiedenmann; Andrei V. Petukhov; Roel P. A. Dullens; Albert P. Philipse

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In Situ Imaging of Field-Induced Hexagonal Columns in Magnetite Ferrofluids

机译：磁铁矿铁磁流体场致六角柱的原位成像

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Field-induced structures in a ferrorluid with well-defined magnetite nanoparticles with a permanent magnetic dipole moment are analyzed on a single-particle level by in situ cryogenic transmission electron microscopy (2D). The field-induced columnar phase locally exhibits hexagonal symmetry and confirms the structures observed in simulations for ferromagnetic dipolar fluids in 2D. The columns are distorted by lens-shaped voids, due to the weak interchain attraction relative to field-directed dipole-dipole attraction. Both dipolar coupling and the dipole concentration determine the dimensions and the spatial arrangement of the columns. Their regular spacing manifests long-range end-pole repulsions that eventually dominate the fluctuation-induced attractions between dipole chains that initiate the columnar transition.

机译：通过原位低温透射电子显微镜（2D）在单粒子水平上分析具有明确定义的具有永久磁偶极矩的磁铁矿纳米粒子的铁磁流体中的场致结构。场致柱状相局部表现出六边形对称性，并证实了在二维中铁磁偶极流体模拟中观察到的结构。由于相对于场定向偶极子-偶极子引力弱的链间吸引力，柱状体被透镜状空隙扭曲。偶极耦合和偶极浓度都决定了色谱柱的尺寸和空间布置。它们的规则间距显示了远距离末端的极排斥力，最终排斥了引发柱状跃迁的偶极链之间的波动引起的吸引力。

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来源
《Physical review letters》 |2006年第18期|p.185702.1-185702.4|共4页
作者
Mark Klokkenburg; Ben H. Erne; Johannes D. Meeldijk; Albrecht Wiedenmann; Andrei V. Petukhov; Roel P. A. Dullens; Albert P. Philipse;
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Van 't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands;

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正文语种 eng
中图分类物理学;
关键词
structural transitions in nanoscale materials; magnetic liquids; colloids;

机译：纳米级材料中的结构转变;磁性液体;胶体;

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1. Optical evidence of magnetic field-induced ferrofluid aggregation: Comparison of cobalt ferrite, magnetite, and magnesium ferrite [J] . Lakic Mladen, Andjelkovic Ljubica, Sulijagic Marija, Optical Materials . 2019,第MAY期

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2. Optical evidence of magnetic field-induced ferrofluid aggregation: Comparison of cobalt ferrite, magnetite, and magnesium ferrite [J] . Lakic Mladen, Andjelkovic Ljubica, Sulijagic Marija, Optical Materials . 2019,第May期

机译：磁场诱导的铁磁流体聚集的光学证据：钴铁氧体，磁铁矿和铁氧体的比较
3. Direct observations of field-induced assemblies in magnetite ferrofluids [J] . N. S. Susan Mousavi, Sachin D. Khapli, Sunil Kumar Journal of Applied Physics . 2015,第10期

机译：磁铁矿铁磁流体中场致组件的直接观测
4. A Ferrofluid Immunoassay Based on Magnetic Field-Induced Birefringence [C] . Ben Y. Ku, David A. Horsley IEEE Sensors . 2007

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5. Field-induced magnetic phase transitions and correlated electronic states in the hexagonal (R)silver germanide and (R)platinum indium series. [D] . Morosan, Emilia. 2005

机译：六方（R）锗化银和（R）铂铟系列的场感应磁相变和相关的电子态。
6. Direct observations of field-induced assemblies in magnetite ferrofluids [O] . N. S. Susan Mousavi, Sachin D. Khapli, Sunil Kumar -1

机译：磁铁矿铁磁流体中场致组件的直接观测
7. In situ imaging of field-induced hexagonal columns in magnetite ferrofluids. [O] . Klokkenburg, M, Erné, BH, Meeldijk, JD, 2006

机译：磁铁矿铁磁流体中场致六角柱的原位成像。
8. Field-Induced Magnetic Phase Transitions and Correlated Electronic States in the Hexagonal RAgGe and RPtIn Series [R] . Morosan, E. 2005

机译：六角形RagGe和RptIn系列中的场致磁相变和相关电子态

In Situ Imaging of Field-Induced Hexagonal Columns in Magnetite Ferrofluids

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