Magnetic-Field-Induced Formation of One-Dimensional Magnetite Nanochains

Wang, Hui; Chen, Qianwang; Sun, Lixia; Qi, Haiping; Yang, Xi; Zhou, Shuai; Xiong, Jie

doi:10.1021/la900234n

Cited by 113 publications

(90 citation statements)

References 32 publications

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“…A most synthetic method for magnetite NPs is usually carried out by the aqueous coprecipitation of Fe 2+ and Fe 3+ [12]. However, magnetic-field induction [13][14][15], chemical vapor deposition [16][17][18][19] and hard templated synthetic methods [20][21][22] have also been developed to fabricate 1D magnetites. The above methods for 1D magnetite usually need some special equipments such as high temperature furnaces and magnetic devices which cause a complex and tedious synthesis process.…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost and High-Yield Production of Magnetite Nanorods With High Saturation Magnetization

Cui

et al. 2015

J. Chil. Chem. Soc.

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Nanopowders of single-crystalline rod-like magnetite have been synthesized in a glycerol-water system under hydrothermal condition by using the goethite (α-FeOOH) precursor. The influence of different reaction parameters on the morphology and composition of the products have been investigated. The structure, morphology and magnetic properties of the products were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and superconducting quantum interference device (SQUID). The results show that every as-prepared Fe 3 O 4 nanorod with diameter ca.70nm grows along the [110] direction which is one of easy magnetic axes of magnetite. The ratio of glycerol to water has a great effect on the purity at given temperature. Magnetic measurements indicated that the specific saturation magnetization (M s ) and coercivity values (H c ) of magnetite nanorods were 90 emu/g and 172Oe, respectively. An in situ dissolution-reduction-reassembling formation mechanism is recommended for as-synthesized magnetite nanorods.

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Section: Introductionmentioning

confidence: 99%

A Low-Cost and High-Yield Production of Magnetite Nanorods With High Saturation Magnetization

Cui

et al. 2015

J. Chil. Chem. Soc.

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“…99 There are numerous reports describing the spontaneous assembly of ferromagnetic nanoparticles into linear and branched chains. [100][101][102] In the following discussion, we will highlight several important examples where self-assembly of magnetic nanostructures is induced by external magnetic field.…”

mentioning

confidence: 99%

Magnetic nanoparticles: recent advances in synthesis, self-assembly and applications

et al. 2011

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Nanostructured magnetic materials have a variety of promising applications spreading from nano-scale electronic devices, sensors and high-density data storage media to controlled drug delivery and cancer diagnostics/treatment systems. Magnetic nanoparticles offer the most natural and elegant way for fabrication of such (multi-) functional materials. In this review, we briefly summarize the recent progress in the synthesis of magnetic nanoparticles (which now can be done with precise control over the size and surface chemistry), and nanoscale interactions leading to their self-assembly into 1D, 2D or 3D aggregates. Various approaches to self-organization, directed-, or template-assisted assembly of these nanostructures are discussed with the special emphasis on magnetic-field enabled interactions. We also discuss new physical phenomena associated with magnetic coupling between nanoparticles and their interaction with a substrate and the characterization of the physical properties at the nanoscale using various experimental techniques (including scanning quantum interferometry (SQUID) and magnetic force microscopy). Applications of magnetic nanoparticle assemblies in data storage, spintronics, drug delivery, cancer therapy, and prospective applications such as adaptive materials and multifunctional reconfigurable materials are also highlighted.

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“…Not only individual magnetic nanoparticles, but also small clusters of NPs can be assembled into ordered chains by applying an external magnetic field, as shown by the work of Wang et al 82 In this approach, nanoclusters with an average diameter of 120 nm were synthesised starting from ferrocene and then assembled into chains using an external magnetic field (Fig. 8c).…”

Section: Magnetic Assemblymentioning

confidence: 98%

Shape matters: synthesis and biomedical applications of high aspect ratio magnetic nanomaterials

2015

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High aspect ratio magnetic nanomaterials possess anisotropic properties that make them attractive for biological applications. Their elongated shape enables multivalent interactions with receptors through the introduction of multiple targeting units on their surface, thus enhancing cell internalization. Moreover, due to their magnetic anisotropy, high aspect ratio nanomaterials can outperform their spherical analogues as contrast agents for magnetic resonance imaging (MRI) applications. In this review, we first describe the two main synthetic routes for the preparation of anisotropic magnetic nanomaterials: (i) direct synthesis (in which the anisotropic growth is directed by tuning the reaction conditions or by using templates) and (ii) assembly methods (in which the high aspect ratio is achieved by assembly from individual building blocks). We then provide an overview of the biomedical applications of anisotropic magnetic nanomaterials: magnetic separation and detection, targeted delivery and magnetic resonance imaging.

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Magnetic-Field-Induced Formation of One-Dimensional Magnetite Nanochains

Cited by 113 publications

References 32 publications

A Low-Cost and High-Yield Production of Magnetite Nanorods With High Saturation Magnetization

A Low-Cost and High-Yield Production of Magnetite Nanorods With High Saturation Magnetization

Magnetic nanoparticles: recent advances in synthesis, self-assembly and applications

Shape matters: synthesis and biomedical applications of high aspect ratio magnetic nanomaterials

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