High-power ultrasonic synthesis and magnetic-field-assisted arrangement of nanosized crystallites of cobalt-containing layered double hydroxideu

• Autor(a) principal: Salak, Andrei N.
• Data de Publicação: 2019
• Outros Autores: Vieira, Daniel E. L., Lukienko, Irina M., Shapovalov, Yuriy O., Fedorchenko, Alexey V., Fertman, Elena L., Pashkevich, Yurii G., Babkin, Roman Yu., Shilin, Aleksandr D., Rubanik, Vasili V., Ferreira, Mário G. S., Vieira, Joaquim M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/26334
• topic: Magnetic layered structure; Oxygen octahedron; Anisotropic crystallite; Highly-ordered arrangement

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.