Autor(es)

Sandrini, Daiana M. Furlan ; Morgado, Daniella Lury ; de Oliveira, Adilson J. A. ; de Moraes, Daniel A. ; Varanda, Laudemir C. ; Frollini, Elisabete

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Biological Macromolecules; v. 264, p. 17-pg., 2024-03-08.

Resumo

This study investigated the homogeneous synthesis of cellulose acetate (CA) and propionate (CP) with varying degrees of substitution (DS) from sisal cellulose in a N , N -dimethylacetamide/lithium chloride (DMAc/LiCl) solvent system. These esters were used to prepare neat (CA DS F/CP DS F) and nanocomposite films (CA DS FFe/ CP DS FFe) from prior synthesized magnetite nanoparticles (NPs, Fe 3 O 4 , 5.1 +/- 0.5 nm). Among the CA and CP series, the composite CA 0.7 FFe and the neat CP 0.7 F films exhibited the highest modulus of elasticity, 2105 MPa and 2768 MPa, respectively, probably a consequence of the continuous fibrous structures present on the surface of these films. Microsphere formation on the film's surface was observed in scanning electron microscopy micrographs. This points to applications in the controlled release of targeted substances. The VSM analysis showed that the cellulosic matrices preserved the superparamagnetic characteristics of the NPs. This study suggested a reduced coupling effect between nanoparticles inside polymeric films due to magnetic saturation at low fields. CA 0.7 FFe and CA 1.3 FFe composite films reached a saturation magnetization (M SAT ) of 46 emu/g around 7 kOe field. Hosting magnetite nanoparticles in cellulose ester matrices may be an interesting way to develop new functional cellulose -based materials, which have the potential for diverse applications, including microelectromechanical systems and microsensors. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 20/06501-5 - Nanopartículas magnéticas com propriedades hipertérmicas intensificadas para tratamento de câncer
• Beneficiário: Laudemir Carlos Varanda
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/01284-2 - Nanopartículas teranósticas a base de óxido de ferro superparamagnético para terapia de câncer da pele via hipertermia magnética
• Beneficiário: Laudemir Carlos Varanda
• Modalidade de apoio: Auxílio à Pesquisa - Regular