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Rod-shaped nanostructures based on superparamagnetic nanocrystals as viscosity sensors in liquid
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Figures

Image of FIG. 1.

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FIG. 1.

TEM characterization of the initial nanocrystals and of the corresponding rod-shaped nanostructures obtained. On the upper panels TEM images of the single nanocrystals of Fe3O4 (left) and of MnFe2O4 (right) are reported. The TEM images of the corresponding aggregated structures are shown in the bottom panels for iron oxide (left) and manganese-iron oxide (right). The scale bars correspond to 100 nm for the two upper panels and 500 nm for the two lower ones.

Image of FIG. 2.

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FIG. 2.

(upper panel) Schematic diagram of the experimental setup. The angle α represents the angle of orientation of the magnetic field in the experimental frame. (lower panel) Polar plot of the intensity of the light scattered by a sample of nanobars of manganese-iron oxide as a function of the angle of orientation of the magnetic field. The empty symbols represent the intensity of the light scattered by the sample in absence of magnetic field, while the black ones represent the intensity of the scattered light as a function of the angle α. It is clear that the maximum occurs when the rods are oriented toward a direction perpendicular to the direction of the optical detector.

Image of FIG. 3.

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FIG. 3.

(upper panel) ZFC-FC curves for a sample of isolated MnFe2O4 nanocrystals. To further demonstrate the superparamagnetic behavior of the sample, an isothermal curve taken at 298 K on the same sample is shown in the inset. Results are expressed as absolute value of the longitudinal moment, i.e. the magnetization moment along the axis of the applied field (lower panel). The same as for the upper figure, but for the aggregated magnetic nanobars: the persistence of the superparamangetic behavior in this sample at room temperature is clearly demonstrated by these curves.

Image of FIG. 4.

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FIG. 4.

(upper panel) Phase delay between the sinusoidal current signal that drives the rotation of the magnetic field in the setup and the scattering intensity from the sample collected by the detector. Values, converted in degrees and shifted to give a zero value for the static case (i.e., frequency=0) are plotted as a function of the driving frequency. TEM images refer to the sample used, which is composed by structures made of MnFe2O4 nanocrystals. Scale bars are 500 nm for the picture on the left and 100 nm for the one on the right. (lower panel) Normalized modulation amplitude of the scattering signal as a function of the field rotation frequency, calculated as peak-to-valley modulation amplitude divided by the signal mean value. The inset reports an example of the scattering signal evolution in time (upper curve) with its corresponding sinusoidal driving signal, as collected during the experiment.

Image of FIG. 5.

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FIG. 5.

(upper panel) Phase lag as a function of rotation frequency for three different samples with different glucose concentration in a solution of mixed water and AcN (80 and 20%vol., respectively). (lower panel) Slope of the three curves in the upper panel for small values of the phase delay as a function of the glucose concentration in the solution. The starting solution of nanomagnets was the same as used for Figure 3.

Image of FIG. 6.

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FIG. 6.

Measurement on the same nanomagnets used for measures reported in Figure 4 re-dispersed in water after complete AcN drying.

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/content/aip/journal/jap/110/6/10.1063/1.3638695
2011-09-21
2014-04-24

Abstract

Superparamagneticnanostructures are becoming increasingly important as tools for biological and medical applications. We report the study of the movement of rod-shaped assemblies of superparamagneticnanocrystals under the action of a rotating magnetic field. The dynamic was characterized by means of light scatteringdetection at different frequencies and for different values of the intensity of the applied external field. The possibility to correlate the motion to the viscosity of the medium is used to monitor viscosity changes inside the liquid. We propose this technique as a valuable tool to monitor viscosity at microscale for application in biological studies.

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Scitation: Rod-shaped nanostructures based on superparamagnetic nanocrystals as viscosity sensors in liquid
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/6/10.1063/1.3638695
10.1063/1.3638695
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