resumo
Magnetite nanoparticles were synthesized by the co-precipitation method with and without the assistance of an additive, namely, gelatin, agar-agar or pectin, using eco-friendly conditions and materials embodying a green synthesis process. X-ray diffraction and transmission electron microscopy were used to analyze the structure and morphology of the nanoparticles. Magnetic properties were investigated by SQUID magnetometry and Fe-57 Mossbauer spectroscopy. The results show that the presence of the additives implies a higher reproducibility of the morphological magnetic nanoparticle characteristics compared with synthesis without any additive, with small differences associated with different additives. To assess their potential for magnetic hyperthermia, water-based suspensions of these nanoparticles were prepared with and without citric acid. The stable solutions obtained were studied for their structural, magnetic and heating efficiency properties. The results indicate that the best additive for the stabilization of a water-based emulsion and better heating efficiency is pectin or a combination of pectin and agar-agar, attaining an intrinsic loss power of 3.6 nWg(-1).
palavras-chave
CROSS-LINKING; DELIVERY; GELATIN; STABILITY; CHITOSAN; BEHAVIOR; FILMS
categoria
Chemistry; Science & Technology - Other Topics; Materials Science; Physics
autores
Ferreira, LP; Reis, CP; Robalo, TT; Jorge, MEM; Ferreira, P; Goncalves, J; Hajalilou, A; Cruz, MM
nossos autores
Joana Daniela Ferreira Gonçalves
Bolseiro de investigação
Paula Celeste da Silva Ferreira
Investigador CoordenadorGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
Projectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This research had financial support from the Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) I.P./MCTES through national funds (PIDDAC) in projects OrMagNa-PTDC/NANMAT/28785/2017 and the Centre grants UIDB/04046/2020 and UIDP/04046/2020 to BioISI and UIDB/50011/2020, UIDP/50011/2020 and LA/P/0006/2020 to CICECO and through the funding of research infrastructure NECL-proj. 22096 (including a grant for Abdollah Hajalilou).