Magnetic field-induced growth and self-assembly of cobalt nanocrystallites

Niu, Helin; Chen, Qianwang; Zhu, Hongfei; Lin, Yuan; Zhang, Xing

doi:10.1039/b303024e

Cited by 144 publications

(122 citation statements)

References 24 publications

(20 reference statements)

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“…Another advantage of this approach is that the reaction proceeds at atmospheric pressure. It is widely believed that magnetic fields may have an effect on the growth of magnetic materials, [20,21] and thus we have introduced a magnetic force into the reaction system. It has been found that the presence of an external magnetic field influences crystal growth to produce different morphologies such as nanospheres, nanowires, and nanoflowers.…”

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confidence: 99%

Non‐Aqueous Sol–Gel Approach towards the Controllable Synthesis of Nickel Nanospheres, Nanowires, and Nanoflowers

et al. 2008

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Nickel nanospheres, nanowires, and nanoflowers are synthesized via a facile non‐aqueous sol–gel route involving the reaction of nickel acetylacetonate with benzyl alcohol at 200 °C in the presence of varying magnetic fields, as illustrated in the figure. Benzyl alcohol acts as both the solvent and reductant in this system. The nanostructures show substantial enhancement in coercivity as compared to bulk nickel.

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confidence: 99%

Non‐Aqueous Sol–Gel Approach towards the Controllable Synthesis of Nickel Nanospheres, Nanowires, and Nanoflowers

et al. 2008

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“…Due to this reason the types of self-assembled nanostructures formed by spherical magnetic colloids are far richer than those which are driven by all-attractive, spherically symmetric potentials of van der Walls interactions. The dipolar attraction is the strongest if the dipoles are put ''in-line'' configuration, which promotes the nanomagnets to assemble into linear chains [82][83][84][85] or ring structures 86,87 from dilute solutions. The type of the morphology depends on the magnetic interaction energy in comparison to the thermal fluctuations.…”

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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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“…Each carbon material has a different way of aggregating upon cooling of these hexagonal layers, which leads to the formation of various textures. Recently, magnetic field-induced growth and self-assembly of cobalt nanocrystallites was studied by Niu et al [5]. Other reports in which a chemical reaction was conducted in a magnetic field include the order observed in assemblies of superparamagnetic carrier particles reported by Rotariu [6], strain detected in iron-based ferromagnetic shape memory alloys reported by Sakamoto et al [7] and superconductivity measured in hybrid ferromagnets [8].…”

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confidence: 96%