Assembly of magnetic nanoparticles into higher structures on patterned magnetic beads under the influence of magnetic field

Traditionally, magnetic field has long been regarded as an important means for studying the magnetic properties of materials. With the development of synthesis and assembly methods, magnetic field, similar to conventional reaction conditions such as temperature, pressure, and surfactant, has been developed as a new parameter for synthesizing and assembling special structures. To date, magnetic fields have been widely employed for materials synthesis and assembly of one-dimensional (1D), two-dimensional (2D) or three-dimensional (3D) aggregates. In this review, we aim to provide a summary on the applications of magnetic fields in this area. Overall, the objectives of this review are: (1) to theoretically discuss several factors that refer to magnetic field effects (MFEs); (2) to review the magnetic-field-induced synthesis of nanomaterials; the 1D structure of various nanomaterials, such as metal oxides/sulfide, metals, alloys, and carbon, will be described in detail. Moreover, the MFEs on spin states of ions, magnetic domain and product phase distribution will be also involved; (3) to review the alignment of carbon nanotubes, assembly of magnetic nanomaterials and photonic crystals with the help of magnetic fields; and (4) to sketch the future opportunities that magnetic fields can face in the area of materials synthesis and assembly.

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“…35). 207 When an external magnetic field was applied, microstructures from suspensions in the presence of magnetic beads were observed. Fig.…”

Section: Alignment Of Carbon Nanotubesmentioning

confidence: 99%

Synthesis and assembly of nanomaterials under magnetic fields

2014

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“…[4][5][6] Other researchers have found that magnetic nanoparticles suspended in a solvent form unique micrometre sized structures when a patterned surface of submicrometre sized magnetic beads is constructed between the magnetic field and the magnetic nanoparticles. 7 While the observed chains provide some indication that the ferrimagnetic particles align with the magnetic field lines, a detailed study to show the overall mapping of alignment and response in terms of chain length formation of ferrimagnetic nanoparticle assemblies within magnetic fields has not been performed to date.…”

Section: Introductionmentioning

confidence: 99%

Imaging magnetic flux lines with iron oxide nanoparticles using a “fossilized liquid assembly”

et al. 2011

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Directed self-assembly of nanomaterials via external fields is an attractive processing tool for industry as it is inherently inexpensive and flexible. Direct observations of this process are however challenging due to the nano and meso length scales involved. The self-assembly of magnetic nanoparticles in particular has gained much recent interest for applications ranging from biomedical imaging and targeted cancer therapy to ferrofluid mechanical damping devices, that rely on the state of aggregation and alignment of the nanoparticles. We utilize an oil-water platform to directly observe directed selfassembly of magnetic nanoparticles that are field ordered into two-dimensional mesostructures through the fossilized liquid assembly (FLA) method. Our system consisted of polymer-coated iron-oxide nanoparticles (25 nm) which were assembled in the vicinity of the interface between a crosslinkable hydrophobic monomer (UV-polymerizable) oil, and water through the use of external magnetic fields, and then cured with UV light. This flash curing system effectively provides a snapshot of the assembly process and allows for direct visualization of assemblies through the use of both atomic force and optical microscopy. In this study, entire magnetic flux field lines in various geometrical configurations were successfully modelled and mapped out by the magnetic nanoparticles, both in-plane and in perpendicular orientations utilizing FLA. The assemblies showed strong directional selectivity and alignment with the flux field lines and provided evidence of strong dipole interactions which partially caused aggregate sedimentation.

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“…In these years, much effort has been made to understand how magnetic fields influence the growth of crystals and the directed aggregation of nanoparticles. For example, magnetic fields were used to direct the orientation of vanadium pentoxide ribbons [5], the growth of Fe 3 O 4 nanowires [6], the assembly of magnetic nanoparticles [7][8][9][10][11], mouse osteoblast cells [12], and the alignment of grains and particles [13,14]. It has been developed as an effective auxiliary preparation method for anisotropy nanomaterials with various applications [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effects of magnetic field on hydrothermal growth of Cu–Ni system

Wu¹,

Du²,

Lu³

et al. 2010

Journal of Alloys and Compounds

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Assembly of magnetic nanoparticles into higher structures on patterned magnetic beads under the influence of magnetic field

Cited by 19 publications

References 22 publications

Synthesis and assembly of nanomaterials under magnetic fields

Synthesis and assembly of nanomaterials under magnetic fields

Imaging magnetic flux lines with iron oxide nanoparticles using a “fossilized liquid assembly”

Effects of magnetic field on hydrothermal growth of Cu–Ni system

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