期刊
BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
卷 61, 期 4, 页码 300-312出版社
ELSEVIER
DOI: 10.1016/j.bsecv.2020.12.001
关键词
Chitosan; Magnetic nanocomposites; Superparamagnetism; Suspension stability; Aggregation
资金
- MINECO [359/2014]
- Fundacion Neurociencias y Envejecimiento [MAT2016-80182-R]
Chitosan-coated Fe3O4 nanoparticles were prepared and the coating was modified by varying the volume of glutaraldehyde. The presence of chitosan improved the stability and dispersibility of the samples, but could not completely prevent aggregation.
Chitosan-coated Fe3O4 nanoparticles were prepared by coprecipitation followed by reaction with chitosan and different volumes of glutaraldehyde. Coating was modified by varying the volume of glutaraldehyde and reaction time. XRD pattern shows maxima compatible Fe3O4 structure. FTIR spectroscopia confirms the presence of chitosan, more evident in samples with higher chitosan content, as denoted by TGA. TEM images of samples with low glutaraldehyde content reveal particles coated with a homogeneous chitosan shell. Mean-while, those prepared with high glutaraldehyde volume show nanoparticles dispersed in an organic matrix. Samples present almost superparamagnetic behavior with magnetization saturation values that are reduced as the content of organic matter increases. Regarding the stability of these samples in solution, the presence of a homogeneous coating improves the initial suspension, although it does not prevent its subsequent aggregation over time. How-ever, this aggregation process is reduced for sample synthesized with 1 mL of glutaraldehyde after 6 h of reaction. (C) 2020 SECV. Published by Elsevier Espana, S.L.U.
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