Neutron diffraction from superparamagnetic colloidal crystals
| Autor: | Urs Gasser, Christian Pruner, S. Kralj, Martin Fally, P. Geltenbort, Jürgen Klepp, Sašo Gyergyek, M. Licen, Irena Drevenšek-Olenik, Lucija Čoga, Gergely Nagy |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Neutron diffraction technology industry and agriculture Analytical chemistry Physics::Optics Nanoparticle Bragg's law 02 engineering and technology General Chemistry Neutron scattering Colloidal crystal 021001 nanoscience & nanotechnology Condensed Matter Physics Diffraction efficiency 01 natural sciences Condensed Matter::Soft Condensed Matter Crystal Crystallography biological sciences 0103 physical sciences General Materials Science 010306 general physics 0210 nano-technology Superparamagnetism |
| Zdroj: | Journal of Physics and Chemistry of Solids. 110:234-240 |
| ISSN: | 0022-3697 |
| Popis: | We fabricated a superparamagnetic ordered structure via self-assembly of a colloidal crystal from a suspension of maghemite nanoparticles and polystyrene beads. Such crystals are potential candidates for novel polarizing beam-splitters for cold neutrons, complementing the available methods of neutron polarization. Different bead sizes and nanoparticle concentrations were tested to obtain a crystal of reasonable quality. Neutron diffraction experiments in the presence of an external magnetic field were performed on the most promising sample. We demonstrate that the diffraction efficiency of such crystals can be controlled by the magnetic field. Our measurements also indicate that the Bragg diffraction regime can be reached with colloidal crystals. |
| Databáze: | OpenAIRE |
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