Dynamics of Superparamagnetic and Ferromagnetic Nano-Objects in Continuous-Flow Microfluidic Devices

Clime, Liviu; Drogoff, Boris Le; Veres, Teodor

doi:10.1109/tmag.2007.892322

Cited by 20 publications

(9 citation statements)

References 9 publications

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“…Magnetic particles (100 nm-1 mm) [1,2] are already in use for bioseparations. The magnetophoretic behaviour of micron size magnetic beads and long (micrometer length) nanowires has been investigated [3]. However, much less work has been done on magnetophoresis of particles in the nanoscale regime.…”

Section: Introductionmentioning

confidence: 99%

Optical imaging and magnetophoresis of nanorods

Lim

Tan

Lanni

et al. 2009

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 99%

Optical imaging and magnetophoresis of nanorods

Lim

Tan

Lanni

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…However, when intrinsic properties of individual nano-objects have to be extracted from magnetic measurements of their arrays, an important problem related to the stray (demagnetization) field in these nanostructures has to be addressed. Several nu-merical approaches for clusters of superparamagnetic spherical particles [16], ferromagnetic objects of arbitrary shapes [17]or regular arrays of ferromagnetic nanowires [18][19][20][21][22][23][24][25][26][27] are available in the literature, but their applicability to extended arrays is limited to either a relatively small number or limited size of individual nano-objects.…”

Section: Introductionmentioning

confidence: 99%

The interaction field in arrays of ferromagnetic barcode nanowires

Clime¹,

Zhao²,

Chen³

et al. 2007

Nanotechnology

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The interaction field in arrays of ferromagnetic barcode nanowires Clime, L.; Zhao, S. Y.; Chen, P.; Normandin, F.; Roberge, H.; Veres, T.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca. AbstractA theoretical model and an experimental approach to the identification of the interaction field in ferromagnetic barcode nanowires are described and applied to electrodeposited Ni/Au cylindrical barcode arrays. Elementary hysteresis loops of individual magnetic segments in these barcode nanowires are considered as superpositions of fully irreversible and locally reversible magnetization processes, whose distributions of switching fields are experimentally identified by first order reversal curve measurements. Non-interacting major hysteresis loops of the arrays are computed as superpositions of several elementary loops by considering the distributions of switching fields as probability density functions. The interaction field is then computed from the condition that the geometric transformation of the experimental major hysteresis loop into the Preisach operative plane be well approximated by this non-interacting hysteresis loop. Experimental interaction field values are compared with those obtained by numerical micromagnetic computations and a very good agreement is obtained on extended Ni/Au barcode arrays. The simple and accurate phenomenological model for the interaction field in multisegmented ferromagnetic nanowire arrays proposed here provides an insight into the morphology of these magnetic nanomaterials, as quantitative information about individual nano-objects may be extracted from macroscopic measurements of their arrays.

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“…The cells and paramagnetic particles (Dynabeads MyOne, Dynal, diameter d = 1.05 μm, and magnetic volume susceptibility χ = 1.1) [35] are then mixed in the motility buffer at 2 × 10 10 cells/ml cell concentration. A 1-μl droplet of the mixture is hung from a concave glass slide, shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Bacterial turbulence reduction by passive magnetic particle chains

Liu

Lin

2013

Phys. Rev. E

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We report the experimental observation of the bacterial turbulence reduction in dense E. coli suspensions by increasing the coupling of passive particle additives (paramagnetic particles). Applying an external magnetic field induces magnetic dipoles for particles and causes the formation of vertical chain bundles, which are hard for bacterial flows to tilt and break. The larger effective drag coefficient of chains causes slow horizontal motion of chains, which in turn form obstacles to suppress bacterial flows through the strong correlation in coherent bacterial clusters and intercluster interaction. The interruption of the upward energy flow from individual self-propelling bacteria to the larger scale in the bacterial turbulence with multiscaled coherent flow by the chain bundle leads to more severe suppression in the low frequency (wave number) regimes of the power spectra.

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Dynamics of Superparamagnetic and Ferromagnetic Nano-Objects in Continuous-Flow Microfluidic Devices

Cited by 20 publications

References 9 publications

Optical imaging and magnetophoresis of nanorods

Optical imaging and magnetophoresis of nanorods

The interaction field in arrays of ferromagnetic barcode nanowires

Bacterial turbulence reduction by passive magnetic particle chains

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