Título :	Sonochemical synthesis of magnetite/poly(lactic acid) nanocomposites
Autor :	França, Juliene Oliveira Campos de Lima, Quezia dos Santos Barbosa, Mariana Martins de Melo Fonseca, Ana Lívia Fernandes Machado, Guilherme de França Dias, Sílvia Cláudia Loureiro Dias, José Alves
metadata.dc.identifier.orcid:	https://orcid.org/0000-0002-9145-2752 https://orcid.org/0009-0009-1598-478X https://orcid.org/0000-0002-3351-9226 https://orcid.org/0000-0003-0042-0091
metadata.dc.contributor.affiliation:	University of Brasília, Chemistry Institute, Laboratory of Catalysis University of Brasília, Chemistry Institute, Laboratory of Catalysis University of Brasília, Chemistry Institute, Laboratory of Catalysis University of Brasília, Chemistry Institute, Laboratory of Catalysis University of Brasília, Chemistry Institute, Laboratory of Catalysis University of Brasília, Chemistry Institute, Laboratory of Catalysis University of Brasília, Chemistry Institute, Laboratory of Catalysis
Assunto::	Ácido lático Nanopartículas magnéticas Nanocompósitos Magnetita Polimerização
Fecha de publicación :	11-dic-2023
Editorial :	MDPI
Citación :	FRANÇA, Juliene Oliveira Campos de et al. Sonochemical synthesis of magnetite/poly(lactic acid) nanocomposites. Polymers, Basel, v. 15, n. 24, e4662, 2023. DOI: https://doi.org/10.3390/polym15244662. Disponível em: http://mdpi.com/2073-4360/15/24/4662. Acesso em: 16 jul. 2025.
Abstract:	Nanocomposites based on poly(lactic acid) (PLA) and magnetite nanoparticles (MNP-Fe3O4) show promise for applications in biomedical treatments. One key challenge is to improve the stabilization and dispersion of MNP-Fe3O4. To address this, we synthesized MNP-Fe3O4/PLA nanocomposites using ultrasound mediation and a single iron(II) precursor, eliminating the need for surfactants or organic solvents, and conducted the process under ambient conditions. The resulting materials, containing 18 and 33 wt.% Fe3O4, exhibited unique thermal behavior characterized by two mass losses: one at a lower degradation temperature (Td) and another at a higher Td compared to pure PLA. This suggests that the interaction between PLA and MNP-Fe3O4 occurs through hydrogen bonds, enhancing the thermal stability of a portion of the polymer. Fourier Transform Infrared (FT-IR) analysis supported this finding, revealing shifts in bands related to the terminal –OH groups of the polymer and the Fe–O bonds, thereby confirming the interaction between the groups. Raman spectroscopy demonstrated that the PLA serves as a protective layer against the oxidation of MNP-Fe3O4 in the 18% MNP-Fe3O4/PLA nanocomposite when exposed to a high-power laser (90 mW). Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) analyses confirmed that the synthetic procedure yields materials with dispersed nanoparticles within the PLA matrix without the need for additional reactants.
metadata.dc.description.unidade:	Instituto de Química (IQ)
metadata.dc.description.ppg:	Programa de Pós-Graduação em Química
Licença::	This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
DOI:	https://doi.org/10.3390/polym15244662
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