Matrix assisted formation of ferrihydrite nanoparticles in a siloxane/poly(oxyethylene) nanohybrid

resumo

Matrix-assisted formation of ferrihydrite, an iron oxide hydroxide analogue of the protein ferritin core, in a sol-gel derived organic-inorganic hybrid is reported. The hybrid network (named di-ureasil) is composed of poly(oxyethylene) chains of different average polymer molecular weights grafted to siloxane domains by means of urea cross-linkages and accommodates ferrihydrite nanoparticles. Magnetic measurements, Fourier transform infrared and nuclear magnetic resonance spectroscopy reveal that controlled modification of the polymer molecular weight allows the fine-tuning of the ability of the hybrid matrix to assist and promote iron coordination at the organic-inorganic interface and subsequent nucleation and growth of the ferrihydrite nanoparticles whose core size (2-4 nm) is tuned by the amount of iron incorporated. The polymer chain length, its arrangement and crystallinity, are key factors in the anchoring and formation of the ferrihydrite particles.

palavras-chave

ORGANICALLY MODIFIED SILICATES; FULL-COLOR PHOSPHORS; MAGNETIC-PROPERTIES; INFRARED TEMPERATURE; PROTEIN CAGES; FERRITIN; SCATTERING; POLYMERS; IONS

categoria

Chemistry; Materials Science

autores

Silva, NJO; Amaral, VS; Bermudez, VD; Nunes, SC; Ostrovskii, D; Rocha, J; Carlos, LD

nossos autores

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