Spectroscopic and quantum chemical studies of interaction between the alginic acid and Fe3O4 nanoparticles

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 182; pp. 1 - 7
• Main Authors: Śmiłowicz, Małgorzata, Pogorzelec-Glaser, Katarzyna, Łapiński, Andrzej, Motała, Rafał, Grobela, Marcin, Andrzejewski, Bartłomiej
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.07.2017
• Subjects: DFT calculation; IR spectroscopy; Magnetic nanoparticles; Nanocomposite; DFT calculation; Nanocomposite; IR spectroscopy; Magnetic nanoparticles
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2017.03.056

In this work, we present the spectral investigation of the interactions between the coverage with alginic acid (AA) and nanoparticles for three different composites containing 74, 80, and 88wt% of magnetite. These results show that the Fe3O4 nanoparticles are coated with the AA and indicate that there is an interaction between them. Moreover, we have investigated the thermal and magnetic properties of all investigated compounds. We show that bonding of alginic acid to the surface of magnetite results in better thermal stability of the polymer and in higher temperature of AA chains degradation. We find that for dense assembly of magnetite nanoparticles, at low temperatures, the intergranular coupling becomes much stronger than between nanoparticles dispersed in composites. [Display omitted] •Spectral properties of nanocomposites have been discussed.•Interactions between the coverage with AA and nanoparticles were investigated.•The analysis of the position of IR bands provides evidence for interactions.•Bonding of AA to the magnetite results in better thermal stability of the polymer.