Quasi‐One‐Dimensional Assembly of Magnetic Nanoparticles Induced by a 50 Hz Alternating Magnetic Field

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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“…124. Fe 3 O 4 nanoparticles with the diameter of 10-11 nm were in superparamagnetic state at room temperature.…”

Section: Morphological Features Of Self-assembled Arrays Of Magnetic mentioning

confidence: 97%

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

et al. 2011

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“…Evidently, Fe 3 O 4 MNPs are randomly distributed in BHJ-Fe 3 O 4 , while Fe 3 O 4 MNPs are aligned in certain orders in BHJ-Fe 3 O 4 W/H. These aligned Fe 3 O 4 MNPs are solely due to the magnetic dipole interaction 31 32 33 . Due to the magnetically and electrically anisotropic properties of Fe 3 O 4 MNPs, e.g.…”

mentioning

confidence: 97%

“…Due to the magnetically and electrically anisotropic properties of Fe 3 O 4 MNPs, e.g. Fe 3 O 4 Janus particles 34 , the coercive electric field within Fe 3 O 4 MNPs can be constrained in vertically direction by means of magnetically induced rotation and alignment of Fe 3 O 4 MNPs, which originate from the magnetic dipole direction within an external magnetostatic field 31 . This coercive electric field makes Fe 3 O 4 MNPs to be temporarily bound with the separated charge carriers in the ordered directions, which facilitates separated charge carriers to be transported to the respective electrodes.…”

mentioning

confidence: 99%

Effects of Magnetic Nanoparticles and External Magnetostatic Field on the Bulk Heterojunction Polymer Solar Cells

Wang

Liu

et al. 2015

Sci Rep

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The price of energy to separate tightly bound electron-hole pair (or charge-transfer state) and extract freely movable charges from low-mobility materials represents fundamental losses for many low-cost photovoltaic devices. In bulk heterojunction (BHJ) polymer solar cells (PSCs), approximately 50% of the total efficiency lost among all energy loss pathways is due to the photogenerated charge carrier recombination within PSCs and low charge carrier mobility of disordered organic materials. To address these issues, we introduce magnetic nanoparticles (MNPs) and orientate these MNPS within BHJ composite by an external magnetostatic field. Over 50% enhanced efficiency was observed from BHJ PSCs incorporated with MNPs and an external magnetostatic field alignment when compared to the control BHJ PSCs. The optimization of BHJ thin film morphology, suppression of charge carrier recombination, and enhancement in charge carrier collection result in a greatly increased short-circuit current density and fill factor, as a result, enhanced power conversion efficiency.

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“…Apart from static magnetic field, time-varied magnetic fields have also been exploited to control and modulate the assembled structures in the past decades [107]. For instance, the Fe 3 O 4 nanoparticles aggregate into mesoscale fibers that are several hundreds of micrometers long when a time-varied magnetic field is applied [108]. Time-varied magnetic field can induce the oscillation of the internal magnetic moments between Fe 3 O 4 clusters.…”

Section: Magnetic Field Assisted Assemblymentioning

confidence: 99%

Biogenic and biomimetic magnetic nanosized assemblies

Dong

Zhang

et al. 2012

Nano Today

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Quasi‐One‐Dimensional Assembly of Magnetic Nanoparticles Induced by a 50 Hz Alternating Magnetic Field

Cited by 13 publications

References 26 publications

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

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

Effects of Magnetic Nanoparticles and External Magnetostatic Field on the Bulk Heterojunction Polymer Solar Cells

Biogenic and biomimetic magnetic nanosized assemblies

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