Universität zu Köln

Bender, Philipp ORCID: 0000-0002-2492-3956, Wetterskog, Erik, Salazar-Alvarez, German, Bergstrom, Lennart, Hermann, Raphael P., Brueckel, Thomas, Wiedenmann, Albrecht and Disch, Sabrina ORCID: 0000-0002-4565-189X (2022). Shape-induced superstructure formation in concentrated ferrofluids under applied magnetic fields. J. Appl. Crystallogr., 55. S. 1613 - 1622. CHESTER: INT UNION CRYSTALLOGRAPHY. ISSN 1600-5767

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Abstract

The field-induced ordering of concentrated ferrofluids based on spherical and cuboidal maghemite nanoparticles is studied using small-angle neutron scattering, revealing a qualitative effect of the faceted shape on the interparticle interactions as shown in the structure factor and correlation lengths. Whereas a spatially disordered hard-sphere interaction potential with a short correlation length is found for similar to 9 nm spherical nanoparticles, nanocubes of a comparable particle size exhibit a more pronounced interparticle interaction and the formation of linear arrangements. Analysis of the anisotropic two-dimensional pair distance correlation function gives insight into the real-space arrangement of the nanoparticles. On the basis of the short interparticle distances found here, oriented attachment, i.e. a face-to-face arrangement of the nanocubes, is likely. The unusual field dependence of the interparticle correlations suggests a field-induced structural rearrangement.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bender, Philipp UNSPECIFIED orcid.org/0000-0002-2492-3956 UNSPECIFIED Wetterskog, Erik UNSPECIFIED UNSPECIFIED UNSPECIFIED Salazar-Alvarez, German UNSPECIFIED UNSPECIFIED UNSPECIFIED Bergstrom, Lennart UNSPECIFIED UNSPECIFIED UNSPECIFIED Hermann, Raphael P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brueckel, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Wiedenmann, Albrecht UNSPECIFIED UNSPECIFIED UNSPECIFIED Disch, Sabrina UNSPECIFIED orcid.org/0000-0002-4565-189X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-689587
DOI:	10.1107/S1600576722010093
Journal or Publication Title:	J. Appl. Crystallogr.
Volume:	55
Page Range:	S. 1613 - 1622
Date:	2022
Publisher:	INT UNION CRYSTALLOGRAPHY
Place of Publication:	CHESTER
ISSN:	1600-5767
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language IRON-OXIDE NANOPARTICLES Multiple languages Chemistry, Multidisciplinary; Crystallography Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68958