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Core shell particles consisting of cobalt ferrite and silica as model ferrofluids [CoFe2O4–SiO2 core shell particles] by Joachim Wagner; Tina Autenrieth; Rolf Hempelmann is a Materials Science article available to read on EtoBox.

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Nearly monodisperse core shell particles consisting of a magnetic core of cobalt ferrite (CoFe 2 O 4 ) and a shell of silica (SiO 2 ) are prepared via a modified St . ober synthesis. The core shell structure is confirmed by TEM, the size distribution of the whole particles was determined by means of photon correlation spectroscopy and small angle X-ray scattering. Due to charged surface groups of the silica shells and the magnetic moments of the cores, these particles interact both via a screened Coulomb potential and via a magnetic dipole potential. If stray ions are removed in the presence of a mixed bed ion exchanger, the electrostatic repulsion induces colloidal crystallisation. The lattice constant is influenced by the interaction with a magnetic field gradient, indicated by a blue shift of the Laue spots towards increasing field gradient.

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Author

Joachim Wagner; Tina Autenrieth; Rolf Hempelmann

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-8853)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)