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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 7
[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
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 8, n. 2, p. 2170-2179, APR 2019.
Web of Science Citations: 1

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)

FAPESP's process: 09/54082-2 - Acquisition of a vibranting sample magnetometer coupled with a superconducting quantum interference device assensor (Squid-VSM) with cryogenic closed cycle
Grantee:Ernesto Chaves Pereira de Souza
Support type: Multi-user Equipment Program
FAPESP's process: 12/00116-6 - Materials based on raw materials deriving from renewable sources
Grantee:Elisabete Frollini
Support type: Regular Research Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 13/01284-2 - Theranostic nanoparticles based in superparamagnetic iron oxide for skin cancer therapy by magnetic hyperthermia
Grantee:Laudemir Carlos Varanda
Support type: Regular Research Grants