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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Sisal cellulose and magnetite nanoparticles: formation and properties of magnetic hybrid films

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Autor(es):
Furlan, Daiana M. [1] ; Morgado, Daniella Lury [1] ; de Oliveira, Adilson J. A. [2] ; Faceto, Angelo D. [2] ; de Moraes, Daniel A. [3] ; Varanda, Laudemir C. [3] ; Frollini, Elisabete [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Chem Sao Carlos, Ctr Res Sci & Technol BioResources, Macromol Mat & Lignocellulos Fibers Grp, Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Phys Dept, Sao Carlos, SP - Brazil
[3] Univ Sao Paulo, Inst Chem Sao Carlos, Ctr Res Sci & Technol BioResources, Colloidal Mat Grp, Sao Carlos, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 8, n. 2, p. 2170-2179, APR 2019.
Citações Web of Science: 0
Resumo

In this study, sisal cellulose/magnetite-nanoparticle (Fe3O4 NPs; 0.5,1.4, and 3.0 g L-1) hybrid films (denoted as FCFe0.5, FCFe1.4, and FCFe3.0, respectively) were prepared by casting, using the solvent system LiCl/DMAc. Sisal was chosen as a cellulose source because it is a fast- growing plant, in contrast to the long cycle of woody trees, and Brazil accounts for most of the sisal produced in the world. Fe3O4 NPs were chosen owing to their excellent properties (superparamagnetic behavior at room temperature, high chemical stability, and low toxicity). The synthesized magnetite NPs (coated with oleic acid and oleylamine to prevent agglomeration during synthesis) were spherical with an average diameter of 5.1 +/- 0.5 nm (transmission electron microscopy analysis; TEM). X-ray diffraction analysis showed that the NPs were satisfactorily incorporated into the cellulose films (as confirmed by TEM) and that their presence favored the formation of cellulose crystalline domains. FCFe1.4 and FCFe3.0 exhibited higher tensile strengths (14.3 MPa and 12.1 MPa, respectively) than the neat cellulose film (9.9 MPa). The moduli of elasticity of FCFe0.5, FCFe1.4, and FCFe3.0 were 1650, 1500 MPa, and 780 MPa, respectively, lower than that of the cellulose film (1860 MPa), indicating that the incorporation of NPs in the cellulosic matrix decreased the films' stiffness. Hybrid films exhibited high magnetizations at 300 K, i.e., 23.0 emu g(-1) (FCFe0.5), 31.0 emu g(-1 )(FCFe1.4), and 37.0 emu g(-1) (FCFe3.0), as well as no magnetic hysteresis and remanent magnetization (Mr) null, namely, a superparamagnetic behavior at room temperature. The results obtained suggest several applications of hybrid films based on cellulose and magnetite, such as biomedical applications, miniaturized electronic devices, and advanced catalysis. (C) 2019 The Authors. Published by Elsevier B.V. (AU)

Processo FAPESP: 09/54082-2 - EMU: projeto para aquisição de um magnetômetro de amostra vibrante que utiliza como sensor um dispositivo supercondutor de interferência quântica acoplado (Squid-VSM) com circuito fechado de criogenia
Beneficiário:Ernesto Chaves Pereira de Souza
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
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
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
Beneficiário:Elson Longo da Silva
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 12/00116-6 - Materiais baseados em matéria prima oriunda de fonte renovável
Beneficiário:Elisabete Frollini
Linha de fomento: Auxílio à Pesquisa - Regular