Mössbauer studies of core-single-shell and core-double-shell polymer functionalized magnetic nanoparticles

Renzo Rueda-Vellasmin, Noemi Raquel Checca-Huaman, Edson C. Passamani, F. Jochen Litterst, Juan A. Ramos-Guivar

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

3 Citas (Scopus)

Resumen

Two different magnetic core–shell nanohybrids, i) single coated magnetic nanoparticles (NPs) with polyacrylonitrile (PAN) and ii) doubly coated with SiO2 and polyaniline (PANI), were synthesized by a modified chemical co-precipitation method and their structural, vibrational, colloidal, and magnetic properties were systematically studied. XRD and Rietveld refinement have shown the coexistence of 7.4(1) nm γ-Fe2O3 NPs, amorphous silica, and the polymeric chains of PANI for the core-double-shell nanohybrid, i.e., γ-Fe2O3@SiO2@PANI NPs. The γ-Fe2O3 NPs in this nanohybrid had reduced their sizes when compared to bare γ-Fe2O3 NPs or to γ-Fe2O3 NPs in the γ-Fe2O3@PAN nanohybrid. In addition, it has a controlled surface charge potential, i.e., it has been changed from positive in bare γ-Fe2O3/NPs to negative in γ-Fe2O3/PAN NPs (or in γ-Fe2O3@SiO2 NPs). Raman and Infrared studies have also confirmed the surface functionalization. 57Fe Mössbauer spectra of the 7.4(1) nm γ-Fe2O3@SiO2@PANI NPs revealed superparamagnetic fluctuations above 150 K, suggesting that the coating with PANI has inhibited particle agglomeration and reduced interparticle magnetic interactions. In contrast, 57Fe Mössbauer spectra of the γ-Fe2O3/PAN NPs displayed static sextets, as commonly found in NPs bigger than 10 nm. Considering the small particle sizes (< 10 nm), the NP controlled surface charge potential and the good magnetic properties, it can be inferred that these nanohybrids are suitable for magnetic remediation processes.

Idioma originalInglés
Número de artículo27
PublicaciónHyperfine Interactions
Volumen243
N.º1
DOI
EstadoPublicada - dic. 2022
Publicado de forma externa

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