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High-Power Ultrasonic Synthesis and Magnetic-Field-Assisted Arrangement of Nanosized Crystallites of Cobalt-Containing Layered Double Hydroxides

1
Department of Materials and Ceramics Engineering, CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
2
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Nauky Ave., 61103 Kharkov, Ukraine
3
O. Galkin Donetsk Institute for Physics and Engineering of the National Academy of Sciences of Ukraine, 46 Nauky Ave., 03680 Kyiv, Ukraine
4
Institute of Technical Acoustics of National Academy of Sciences of Belarus, Lyudnikov Avenue, 13, 210009 Vitebsk, Belarus
*
Author to whom correspondence should be addressed.
ChemEngineering 2019, 3(3), 62; https://doi.org/10.3390/chemengineering3030062
Received: 11 May 2019 / Revised: 27 June 2019 / Accepted: 3 July 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Advanced Applications of Layered Double Hydroxides)
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Abstract

High-quality stoichiometric Co2Al–NO3 and Co2Al–CO3 layered double hydroxides (LDHs) have been obtained by precipitation followed by anion exchange, both high-power-sonication assisted. Application of high-power ultrasound has been demonstrated to result in a considerable acceleration of the crystallization process and the anion-exchange reaction. Two independent approaches were used to form bulk and 2-D samples of Co2Al–NO3 with the oriented crystallites, namely uniaxial pressing of deposits from sonicated LDH slurries and magnetic field-assisted arrangement of LDH crystallites precipitating on glass substrates. A convenient way of preparation of semi-transparent compacts with relatively big blocks of oriented crystallites have been demonstrated. Thin dense transparent films of highly-ordered crystallites of Co2Al–NO3 LDH have been produced and characterized. View Full-Text
Keywords: magnetic layered structure; oxygen octahedron; anisotropic crystallite; highly-ordered arrangement magnetic layered structure; oxygen octahedron; anisotropic crystallite; highly-ordered arrangement
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Salak, A.N.; Vieira, D.E.L.; Lukienko, I.M.; Shapovalov, Y.O.; Fedorchenko, A.V.; Fertman, E.L.; Pashkevich, Y.G.; Babkin, R.Y.; Shilin, A.D.; Rubanik, V.V.; Ferreira, M.G.S.; Vieira, J.M. High-Power Ultrasonic Synthesis and Magnetic-Field-Assisted Arrangement of Nanosized Crystallites of Cobalt-Containing Layered Double Hydroxides. ChemEngineering 2019, 3, 62.

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