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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.)

Structural analysis of magnetic nanocomposites based on chitosan

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Author(s):
Kloster, Gianina A. [1] ; Muraca, Diego [2] ; Moscoso Londono, Oscar [2, 3] ; Knobel, Marcelo [2] ; Marcovich, Norma E. [1] ; Mosiewicki, Mirna A. [1]
Total Authors: 6
Affiliation:
[1] Univ Nacl Mar del Plata, CONICET, Fac Ingn, Inst Invest Ciencia & Tecnol Mat INTEMA, Mar Del Plata, Buenos Aires - Argentina
[2] Univ Estadual Campinas, UNICAMP, IFGW, Campinas, SP - Brazil
[3] Univ Autonoma Manizales, Fac Ingn, Antigua Estn Ferrocarril, Manizales - Colombia
Total Affiliations: 3
Document type: Journal article
Source: Polymer Testing; v. 72, p. 202-213, DEC 2018.
Web of Science Citations: 6
Abstract

This work investigates the structure and magnetic properties of chitosan based films with different contents of magnetic nanoparticles (MNPs) of around 10 nm as well as the effects of the addition of glycerol as plasticizer. Synthesized MNPs were dispersed in the chitosan film forming solution by ultrasonication and then composite films were obtained by casting. From the morphological analysis, a bimodal distribution of clusters was detected; the larger ones seem to be present mostly in the plasticized samples. Regarding the mechanical behavior of the samples, for the non-plasticized samples the outstanding increase in modulus and strength with the increasing content of MNP was explained by a strong interfacial adhesion and very good particles dispersion into the chitosan matrix. This fact was also supported by the model applyed to the strength as a function of the volume fraction of MNP. Regarding magnetic properties, all nanocomposite films evidenced systems with particles of strong dipolar interactions that lead to blocking and irreversibility temperatures close to room temperature (RT). Even though the isothermal magnetization results showed that the particles in the nanocomposite films behave as super paramagnetic at the highest analyzed temperature (RT). Langevin model as well as FESEM and SAXS analysis supported the hypothesis that the formation of aggregates with different features dominates the magnetic response through collective behavior, mainly in the plasticized films. (AU)

FAPESP's process: 14/26672-8 - Interface and surface effects in magnetic-metal nanoheterostructures
Grantee:Oscar Moscoso Londono
Support Opportunities: Scholarships in Brazil - Post-Doctoral