ISBN 9783843952064

978-3-8439-5206-4, Reihe Physikalische Chemie

Flore Mees
Directed self-organization of cobalt ferrite nanocubes and hematite nanospindles

300 Seiten, Dissertation Universität Köln (2022), Softcover, A5

Zusammenfassung / Abstract

This thesis investigates different methods of directed assembly of cobalt ferrite nanocubes and hematite nanospindles and will improve the understanding to control induced organization, study collective magnetism and further understand the forces formed in these superstructures.

Different cobalt ferrite monolayer assemblies are prepared under different conditions and are characterized by scanning electron microscopy, grazing-incidence X-ray scattering, vibrating sample magnetometry, polarized neutron reflectometry and polarized grazing-incidence small-angle neutron scattering.

The self-organization of hematite nanospindles is analyzed in solution with and without the application of a magnetic field by X-ray photon correlation spectroscopy and at the liquid-air interface with the aid of a Langmuir trough.

Furthermore, a method is developed to tune the magnetic properties of the nanospindles by coating them with iron oxide. These obtained modified spindles are investigated by X-ray powder diffraction, scanning electron microscopy, small-angle X-ray scattering, vibrating sample magnetometry and Mössbauer spectroscopy.