Reviews of topical problems

Small-angle neutron scattering in structure research of magnetic fluids

 a,  a, b
a Frank Neutron Physics Laboratory, Joint Institute of Nuclear Research, Dubna, Moscow Region, Russian Federation
b National Research Centre ‘Kurchatov Institute’, pl. akad. Kurchatova 1, Moscow, 123182, Russian Federation

A magnetic fluid (MF) is a liquid dispersion of magnetic nanoparticles coated by surfactants for stabilization. The MF research reviewed in this paper is primarily aimed at investigating the atomic and magnetic structure of MF particles and the way they interact under various conditions by means of small-angle neutron scattering (SANS). The presence of a liquid carrier in the structure and the magnetic properties of MFs, which are very close to those of an ideal superparamagnetic system, allow the effective use of the major neutron scattering features: the strong effect of hydrogen — deuterium isotopic substitution and magnetic scattering. An extension of the contrast variation technique to the structure research on polydisperse and superparamagnetic systems is proposed. The cases of noninteracting and interacting particles, the latter with cluster formation taken into account, are considered for nonmagnetized and magnetized MFs. The polarized neutron scattering analysis of the structure of magnetized MFs is illustrated by examples. Topical problems in further developing the method to study multiparameter systems are identified.

Fulltext is available at IOP
PACS: 61.05.fg, 61.46.−w, 75.50.Mm (all)
DOI: 10.3367/UFNe.0180.201010a.1009
Citation: Avdeev M V, Aksenov V L "Small-angle neutron scattering in structure research of magnetic fluids" Phys. Usp. 53 971–993 (2010)
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Оригинал: Авдеев М В, Аксенов В Л «Малоугловое рассеяние нейтронов в структурных исследованиях магнитных жидкостей» УФН 180 1009–1034 (2010); DOI: 10.3367/UFNr.0180.201010a.1009

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