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Self-assembly of a binary mixture of iron oxide nanoparticles in Langmuir film: X-ray scattering study
BP Konstantinov Petersburg Nucl Phys Inst, Kurchatov Inst, Natl Res Ctr, Gatchina 188300, Russia.;RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan..
Friedrich Alexander Univ Erlangen Nurnberg, Dept Mat Sci, Inst Polymer Mat, Martensstr 7, D-91058 Erlangen, Germany..
European Synchrotron Radiat Facil, 71 Ave Martyrs,CS40220, F-38043 Grenoble 9, France..
European Synchrotron Radiat Facil, 71 Ave Martyrs,CS40220, F-38043 Grenoble 9, France..
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2017 (English)In: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 202, p. 31-39Article in journal (Refereed) Published
Abstract [en]

In present study we exploited Langmuir technique to produce self-assembled arrays composed of monodisperse iron oxide nanoparticles 10 nm and 20 nm in diameter and of their binary mixture. A combination of in-situ X-ray reflectometry and Grazing-incident small-Angle X-ray scattering was used to obtain in-plane and out-of-plane structure of the arrays directly on the water surface. Surface pressure isotherms and X-ray reflectometry analysis showed that monodisperse 10 nm nanoparticles form a highly ordered monolayer, while 20 nm particles pack in three-dimensional clusters with a short-range (nearest-neighbor) correlations between the particles. In a binary mixture of 10 nm and 20 nm nano particles composed in proportion 3:1 the self-assembly process results in a structure where the monolayer of 10 nm particles is perturbed by the larger particles. Non-trivial mixing causes an enlargement of interparticle distance but keeps the symmetry of two-dimensional lattice of smaller nanoparticles. Estimation of the acting interactions and micromagnetic simulation suggest the optimal formation for monodisperse and binary ensembles.

Place, publisher, year, edition, pages
2017. Vol. 202, p. 31-39
Keywords [en]
Magnetic nanoparticles, X-ray scattering, Langmuir film
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Materials Engineering Materials Chemistry Other Physics Topics
Identifiers
URN: urn:nbn:se:uu:diva-340671DOI: 10.1016/j.matchemphys.2017.08.069ISI: 000413882300005OAI: oai:DiVA.org:uu-340671DiVA, id: diva2:1180228
Available from: 2018-02-05 Created: 2018-02-05 Last updated: 2018-02-05Bibliographically approved

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Vorobiev, Alexei

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