Synthesis of nickel nanodiscs and modification of shells of polyelectrolyte microcapsules with them

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Abstract

Magnetic nickel nanoparticles, especially of anisotropic shape, are increasingly attracting the attention of researchers in the field of biomedicine. In this work, magnetic nickel nanodiscs have been synthesized to modify the shells of polyelectrolyte capsules in order to further create new agents for theranostics based on such a nanocomposite system. To obtain nickel nanoparticles in the form of nanodiscs, the method of alternating electrodeposition of metals in the pores of a polymer track membrane was used. Nanowires with alternating layers of copper and nickel were synthesized, and nickel nanodiscs were isolated by selective etching of copper. The magnetic properties of the nanodiscs were investigated by vibrational magnetometry of an array of nanowires in a polymer matrix. The selected disks were studied by dynamic light scattering, electron microscopy, and small-angle X-ray scattering. The possibility of including nickel nanodiscs in the shells of polyelectrolyte capsules by adsorption on a polycation layer followed by application of a polyanion is demonstrated.

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About the authors

V. V. Sarukhanova

National Research Center “Kurchatov Institute”

Author for correspondence.
Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow

I. М. Doludenko

National Research Center “Kurchatov Institute”

Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow

D. R. Khairetdinova

National Research Center “Kurchatov Institute”; National University of Science and Technology “MISIS”

Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow; Moscow

V. V. Volkov

National Research Center “Kurchatov Institute”

Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow

A. V. Bakirov

National Research Center “Kurchatov Institute”; Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences

Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow; Moscow

Y. V. Grigoriev

National Research Center “Kurchatov Institute”

Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow

D. N. Khmelenin

National Research Center “Kurchatov Institute”

Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow

A. V. Mikheev

National Research Center “Kurchatov Institute”

Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow

T. V. Bukreeva

National Research Center “Kurchatov Institute”

Email: saruhanova.vika@yandex.ru
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Hysteresis loops for nanowire samples with a given nickel layer thickness of 50 nm for two field directions: in the plane of the sample (1) and parallel to its normal (2).

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3. Fig. 2. Distribution of synthesized particles by size according to DLS data.

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4. Fig. 3. TEM image of nickel nanoparticles (a) and their image obtained using a ring dark-field detector (b).

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5. Fig. 4. Volume distributions of particles by the radii of inhomogeneities in the spherical approximation of their shape according to SAXS data (a), particle concentration in suspension: 0.05 (1), 0.1 (2), 0.2 (3) μg/ml. Solid lines correspond to the distribution of the component with a larger size, dashed lines – with a smaller size. Comparison of experimental data with model intensities calculated for the distributions in the figure (a) taking into account the not shown distributions of fractions of small inhomogeneities (b). The intensity curves are shifted vertically for better visualization.

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6. Fig. 5. TEM image of microcapsules modified with nanodisks (a) and their image obtained using a ring dark-field detector (b), as well as distribution maps of nickel (c), carbon (d), oxygen (g), and sulfur (e).

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