Publikation: Light transport and rotational diffusion in optically anisotropic colloidal suspensions
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Zusammenfassung
We have investigated for the first time the influence of magnetic field on rotational diffusion in anisotropic colloidal suspensions by the method of diffusing wave spectroscopy. It has been established that the change of static properties of the sample in magnetic field exceeds the influence of rotational Brawnian motion of colloidal particles.
The main dependencies of magnitude and direction of a magnetic field B on anisotropic diffusion of light has been established. It has been shown that in the case of light propagation perpendicular to the magnetic field the intensity of diffuse light increases with the field B and saturates at the fields 5-7 Tesla. The degree of saturation is more pronounced for higher concentrations of colloidal suspensions. At the same time the ellipticity increases. It was found that in this geometry the diffuse light becomes polarized in direction parallel to field B, independent of the initial polarization of the laser beam. In the case of light propagation parallel to the magnetic field the intensity of diffuse light decreases with the field B and saturates at the field 5-7 Tesla. Again, the degree of saturation is more pronounced for higher concentrations of colloidal suspensions. In this geometry the diffuse light is completely depolarized at all values of the magnetic field.
Zusammenfassung in einer weiteren Sprache
In dieser Arbeit wurde zum ersten Mal der Einfluss eines Magnetfeldes auf die Rotationsdiffusion in anisotropen kolloidalen Suspensionen mittels "Diffusing wave spectroscopy" untersucht. Es wurde nachgewiesen, daß die Veränderung der statischen optischen Eigenschaften der Probe im Magnetfeld den Einfluss der Brown'nschen Rotationsbewegung überwiegt.
Die durchgeführten experimentellen Untersuchungen zur Lichtausbreitung in kolloidalen Suspensionen verschiedener Konzentrationen können mit Hilfe der anisotropen Lichtdiffusion auf grund des Einflusses des Magnetfelds erklärt werden.
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SANDOMIRSKI, Kirill, 2006. Light transport and rotational diffusion in optically anisotropic colloidal suspensions [Dissertation]. Konstanz: University of KonstanzBibTex
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<dcterms:abstract xml:lang="eng">We have investigated for the first time the influence of magnetic field on rotational diffusion in anisotropic colloidal suspensions by the method of diffusing wave spectroscopy. It has been established that the change of static properties of the sample in magnetic field exceeds the influence of rotational Brawnian motion of colloidal particles.<br /><br />The main dependencies of magnitude and direction of a magnetic field B on anisotropic diffusion of light has been established. It has been shown that in the case of light propagation perpendicular to the magnetic field the intensity of diffuse light increases with the field B and saturates at the fields 5-7 Tesla. The degree of saturation is more pronounced for higher concentrations of colloidal suspensions. At the same time the ellipticity increases. It was found that in this geometry the diffuse light becomes polarized in direction parallel to field B, independent of the initial polarization of the laser beam. In the case of light propagation parallel to the magnetic field the intensity of diffuse light decreases with the field B and saturates at the field 5-7 Tesla. Again, the degree of saturation is more pronounced for higher concentrations of colloidal suspensions. In this geometry the diffuse light is completely depolarized at all values of the magnetic field.</dcterms:abstract>
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