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Multifunctional magnetic rotator for micro and nanorheological studies
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10.1063/1.4729795
/content/aip/journal/rsi/83/6/10.1063/1.4729795
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/6/10.1063/1.4729795
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Circuit of magnetic rotator. (b) Circuit of the voltage-current converter. (c) An example of magnetic rotator. (d) Experimental measurements of the magnetic field in the middle of the two face-to-face placed coils as a function of applied current.

Image of FIG. 2.
FIG. 2.

A uniform magnetic field B rotates in a plane of this figure making angle α(t) with the reference X-axis. Magnetic moment of the nanorod, M, makes angle θ (t) with the field direction. Magnetic moment forms angle φ(t) with the reference X-axis.

Image of FIG. 3.
FIG. 3.

Integral curves of Eq. (4) showing the solution behavior for different parameters V(l, d, η, B, m, f) at different initial conditions θ0. (a) V<1. (b) V>1.

Image of FIG. 4.
FIG. 4.

(a) The φ-solutions of Eq. (4) for different driving frequencies of magnetic field. The upper straight lines correspond to the change of alpha-angles with frequencies f = 1 Hz (straight solid line), f = 2 Hz (straight dashed line), and f = 3 Hz (straight dotted line). The corresponding φ-solutions are marked with different symbols. The nanorod rotates synchronously with magnetic field at these frequencies. (b) The φ-solution of Eq. (4) for different driving frequencies of magnetic field. The upper straight lines correspond to the change of alpha-angles with frequencies f = 4 Hz (straight solid line), f = 5 Hz (straight dashed line), and f = 6 Hz (straight dotted line). The corresponding φ-solutions are marked with different symbols.

Image of FIG. 5.
FIG. 5.

Dependence of dimensionless critical frequency fd on nanorod aspect ratio.

Image of FIG. 6.
FIG. 6.

(a) Viscosity of the viscosity standard liquid S600 measured by rotation of the nanorods with different aspect ratios; squares and blue line show the table values of the viscosity; open circles show measured viscosity from 5 independent experiments with nanorods of different aspect ratios. A data point corresponding to the 927.5 mPa·s viscosity was used to obtain constant χ = 290. (b) Two sinusoidal signals sent to two coils at the time moments (c)–(f). Following the generated rotating field, the Ni nanorod rotates counterclockwise at 2 Hz frequency.

Image of FIG. 7.
FIG. 7.

(a) Schematic of the setup for measurements of shear modulus of polymeric filaments. (b) Schematic of a carbon nanotube embedded into the column of sickle cell hemoglobin. (c)–(e) Three images showing the growth of sickle hemoglobin domain initiated by the laser pulse. The black spot corresponds to the cross-section of a nucleating polymerized domain which is almost circular in the cross-section. The nanotube is directed parallel to the coverslips. One end of the nanotube is fixed by the polymerized domain and the rest of the nanotube is exposed to non-polymerized fluid. As the polymerized domain expands, it creates the side dendrites and the column is no longer circular in cross section.

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/content/aip/journal/rsi/83/6/10.1063/1.4729795
2012-06-21
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multifunctional magnetic rotator for micro and nanorheological studies
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/6/10.1063/1.4729795
10.1063/1.4729795
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