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    Self-assembly of a binary mixture of iron oxide nanoparticles in Langmuir film: X-ray scattering study

    Year: 2017

    Journal: Mater. Chem. Phys., Volume 202, DEC 1, page 31–39

    Authors: Ukleev, V.; Khassanov, A.; Snigireva, I.; Konovalov, O.; Dudnik, M.; Dubitskiy, I.; Vorobiev, A.

    Organizations: Russian Foundation for Basic Research [12-02-12066-ofi m, 14-22-01113-ofi m]

    Keywords: Magnetic nanoparticles; X-ray scattering; Langmuir film

    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. (C) 2017 Elsevier B.V. All rights reserved.
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