Magnetic characterization of chitosan–magnetite nanocomposite films

Kloster, Gianina Andrea; Muraca, Diego; Meiorin, Cintia; Pirota, K. R.; Marcovich, Norma Esther; Mosiewicki, Mirna Alejandra

doi:10.1016/j.eurpolymj.2015.09.014

Cited by 17 publications

(9 citation statements)

References 27 publications

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“…According to this equation, and using the diffraction signal corresponding to the (311) plane of the diffraction pattern of NPs powder, the crystallite size was calculated as 9.3 nm, a value that is closer to the values obtained in previous works [18][19][20][21][22].…”

Section: X-ray Diffraction (Xrd)supporting

confidence: 78%

“…NPs have been incorporated recently with success in different polymeric matrices leading to novel materials with potential applications in, for example, biomedicine, biotechnology and materials science [1][2][3][4][5][6][18][19][20][21][22]. However, only a few works relate to the addition of magnetite NPs to a segmented polyurethane matrix and the effect of the nanoparticles on the structural and functional properties of the nanocomposites [23][24][25][26].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Nanocomposites with shape memory behavior based on a segmented polyurethane and magnetic nanostructures

et al. 2018

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Shape-memory composites based on a commercial segmented polyurethane and magnetite (Fe 3 O 4) nanoparticles (NPs) were prepared by a simple suspension casting method. The properties of the resulting nanocomposites, containing 1 to 10 nominal wt.% magnetic particles, were evaluated by thermogravimetric tests, contact angle measurements, differential scanning calorimetry, infrared and X-ray spectroscopy, static and thermal cyclic tensile tests, dynamic mechanical analysis and experiments of alternating-magnetic-field heating. It was found that most of the suspended NPs could be successfully incorporated into the polyurethane matrix, and thus composite samples with up to 7 wt.% actual concentration were obtained. On the other hand, the incorporation of magnetite nanoparticles to the shape memory polyurethane did not significantly affect most of the matrix properties, including its shape memory behavior, while added magnetic response to the nanocomposites. Thus, nanocomposites were able to increase in temperature when exposed to an alternating magnetic field, which allowed them to recover their original shape quickly by an indirect triggering method.

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Section: X-ray Diffraction (Xrd)supporting

confidence: 78%

Section: Accepted Manuscriptmentioning

confidence: 99%

Nanocomposites with shape memory behavior based on a segmented polyurethane and magnetic nanostructures

et al. 2018

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“…Different methods of synthesis lead to different degrees of interaction of the particles with the matrix and the amount of plasticizer that can be retained into the film. The synthesis of magnetic particles and posterior incorporation into the chitosan solution could lead to a weaker interaction between matrix and particles/clusters than the "in situ" synthesis [24] and in this way; the magnetic entities would be freer to react in the presence of an external magnetic field. In addition, this last method allows a better control of the amount of plasticizer required in the films that can significantly affect some specific properties (for example, mechanical properties) in comparison with that of the nanocomposite films prepared by the "in situ" method.…”

Section: -This Information Was Included In This Revised Version Of Thmentioning

confidence: 99%

Structural analysis of magnetic nanocomposites based on chitosan

et al. 2018

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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.

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“…These nanoparticles also cause secondary pollution to the environment due to their very minute dimensions (Li et al, 2017). On the other hand, we prepared and characterized thoroughly composite films made from magnetic iron oxides nanoparticles and chitosan by different, but relatively simple and cost-effective obtaining procedures Kloster, Muraca et al, 2015;Kloster et al, 2018). These films can perform as convenient and efficient natural polymer-based adsorbents, without the drawbacks associated to nano-particulate loose systems.…”

Section: Introductionmentioning

confidence: 99%