title: Spectroscopic and quantum chemical studies of interaction between the alginic acid and Fe3O4nanoparticles.
abstract: 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 Fe3O4nanoparticles 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.
authors.affiliation: Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland; Nanobiomedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Śmiłowicz
authors.affiliation: Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Pogorzelec-Glaser
authors.affiliation: Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland. Electronic address: lapinski@ifmpan.poznan.pl.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Łapiński
authors.affiliation: Institute of Plant Protection - National Research Institute, W. Węgorka 20, 60-318 Poznań, Poland.
authors.forename: Rafał
authors.initials: R
authors.lastname: Motała
authors.affiliation: Institute of Plant Protection - National Research Institute, W. Węgorka 20, 60-318 Poznań, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Grobela
authors.affiliation: Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
authors.forename: Bartłomiej
authors.initials: B
authors.lastname: Andrzejewski
keywords: DFT calculation; IR spectroscopy; Magnetic nanoparticles; Nanocomposite