Pattern formation in an array of magnetic nanoscale rods mimics magnetic-dipole interaction-driven spinodal decomposition

Wolf, H.; Birringer, R.

doi:10.1063/1.2067709

Cited by 18 publications

(16 citation statements)

References 19 publications

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“…In general, linear 1D assemblies of magnetic nanoparticles have received considerable interest in various fields including micromechanical sensors 14,15 , microfluidics 16 , micro-swimmers 17 and also fundamental science 18 . Different techniques exist to synthesize 1D nanoparticle chains 11,12,[19][20][21] however, thanks to the high biological control imposed in the synthesis of the magnetosomes, magnetotactic bacteria produce 1D nanostructures with high reproducibility and quality 22 . Due to their exceptional properties magnetotactic bacteria, such as M. gryphiswaldense, remain highly investigated, motivating several experimental studies where their structural [23][24][25] and magnetic properties [26][27][28] were evaluated.…”

Section: Introductionmentioning

confidence: 99%

Probing the stability and magnetic properties of magnetosome chains in freeze-dried magnetotactic bacteria

et al. 2020

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Magnetospirillum gryphiswaldense biosynthesize high quality magnetite nanoparticles, called magnetosomes, and arrange them into a chain that behaves like a magnetic compass. Here we perform magnetometry and polarized small-angle neutron scattering (SANS) experiments on a powder of freeze-dried and immobilized M. gryphiswaldense. We confirm that the individual magnetosomes are single-domain nanoparticles and that an alignment of the particle moments along the magnetic field direction occurs exclusively by an internal, coherent rotation. Our magnetometry results of the bacteria powder indicate an absence of dipolar interactions between the particle chains and a dominant uniaxial magnetic anisotropy. Finally, we can verify by SANS that the chain structure within the immobilized, freeze-dried bacteria is preserved also after application of large magnetic fields up to 1 T.

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Section: Introductionmentioning

confidence: 99%

Probing the stability and magnetic properties of magnetosome chains in freeze-dried magnetotactic bacteria

et al. 2020

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“…For this reason, the formation of nanoparticle arrays has attracted much attention. Nanoxerography, 4,5 Dip-pen lithography, 6 aerodynamic lenses, 7 magnetic field assisted self-assembly, 8 electrostatic assembly with focused ion beam charging, 9 electrostatic funneling, 10 and p-n junction based electrostatic method 11 were used to produce nanoparticle patterns. Recently, electrodynamic focusing concept for charged aerosols using ion charge accumulation was reported.…”

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confidence: 99%

Focused patterning of nanoparticles by controlling electric field induced particle motion

Lee

You

Woo

et al. 2009

Applied Physics Letters

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We report a general methodology for producing focused arrays of nanoparticles via electrodynamic focusing approach and controlling the inertial effect of charged aerosols. An important effect of particle inertia is identified and verified by performing detailed calculations of electric field induced particle motion and experimenting with electrosprayed nanoparticles. The controllability of focusing is demonstrated by changing the curvature of electric field lines.

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“…3) clearly show that the cobalt particles exhibit a trend to join forming "chains" or "clusters". Wolf and Birringer observed similar behavior of Fe nanoparticles [19]. They suggested that such self-organization is due to magnetic dipole interactions between particles.…”

Section: Resultsmentioning

confidence: 60%

Preparation and characterization of cobalt–bismuth nano- and micro-particles

Odeh

Mahmoud

Vassilev

2007

International Journal of Materials Research

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An attempt at the preparation and characterization of Co -Bi nano-and micro-particles is presented. Firstly, predetermined compositions were obtained by simultaneous precipitation from solutions containing Bi(NO 3 ) 3 · 5 H 2 O and Co(NO 3 ) 3 · x H 2 O. The precipitates were heated under oxygen flow and in air, and thereafter reduced to metals under hydrogen flow at 673 K. Correlation between the predetermined and the actual compositions of the products was found. Characterization of the precipitates was carried out employing X-ray diffraction, scanning and transmission electron microscopy. The dimensions of the particles vary from nano-to micro-scale sizes. It was found that face centered cubic cobalt (i. e. fcc-Co modification, that is metastable up to 695 K) is the predominant cobalt phase while the hexagonal close packed cobalt (hcp-Co) is only present in small amounts. Thermodynamic calculations have shown that the molar specific surface energy of the fcc-Co should be around 0.5 J m -2 less than that of the hcp-Co (3.2 J m -2 ), in order to make the small fcc-Co particles more stable than those of hcp-Co.

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Pattern formation in an array of magnetic nanoscale rods mimics magnetic-dipole interaction-driven spinodal decomposition

Cited by 18 publications

References 19 publications

Probing the stability and magnetic properties of magnetosome chains in freeze-dried magnetotactic bacteria

Probing the stability and magnetic properties of magnetosome chains in freeze-dried magnetotactic bacteria

Focused patterning of nanoparticles by controlling electric field induced particle motion

Preparation and characterization of cobalt–bismuth nano- and micro-particles

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