Synthesis and Characterization of Silica Core/Multilayered Cobalt Ferrite-Silica Shell Particles for Lipase Immobilization

Multilayered core/shell particles were prepared by four-step deposition of cobalt ferrite layers and then deposition of external silica layer on the surface of silica core particles. The ferrite nanoparticles were obtained by co-precipitation of Co2+ and Fe3+ ions at pH=11 and pH=15, respectively. T...

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Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 24; no. 6; p. 1
Main Authors Nikolić, Milan P., Pavlović, Katarina V., Stanojević-Nikolić, Slobodanka, Maričić, Aleksa, Srdić, Vladimir V.
Format Journal Article
LanguageEnglish
Portuguese
Published Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 01.01.2021
ABM, ABC, ABPol
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects
Cobalt ferrites
Core-shell
Core-shell particles
Deposition
ENGINEERING, CHEMICAL
Immobilization
Lipase
magnetic properties
MATERIALS SCIENCE, MULTIDISCIPLINARY
mesoporous silica
METALLURGY & METALLURGICAL ENGINEERING
multilayered shell
Nanoparticles
Silicon dioxide
Sodium silicates
Thermal stability
multilayered shell
mesoporous silica
magnetic properties
immobilization
Core-shell
lipase
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Summary:Multilayered core/shell particles were prepared by four-step deposition of cobalt ferrite layers and then deposition of external silica layer on the surface of silica core particles. The ferrite nanoparticles were obtained by co-precipitation of Co2+ and Fe3+ ions at pH=11 and pH=15, respectively. The agglomerated silica core/cobalt ferrite shell particles were obtained at extremely basic pH (pH=15), while at pH =11, monodispersed and non-aggregated core-shell particles were obtained. The poly(diallyldimethylammonium chloride)-functionalized silica core/ferrite shell particles were used as templates for deposition of mesoporous silica layers (obtained by neutralization of highly basic sodium silicate solution). The obtained porous multilayered core/shell particles were used as a host for covalent lipase immobilization inside the external silica layer. The initial activity of immobilized enzymes was about 13-fold lower than the native one, however, it showed good reusability and improved thermal stability compared to native ones.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2021-0130