Effect of the swelling degree on the formation of magnetite nanoparticles in hydrogelsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Composites containing magnetite nanoparticles in poly(acrylamide-co-hydroxyethylacrylate)
cross-linked using poly-ethylene–glycol-diacrylate were prepared and characterized.
The magnetite was synthesized in situ in the polymer network by treatment with a water
solution of Fe (II) and Fe (III). The salts were then coprecipitated by exposing the swollen
gels to ammonia vapors and the obtained magnetic gels dried. The ratio acrylamide (AM)/
hydroxyethylacrylate (HEA) was varied to compare matrices with different hydrophilicity.
Moreover solutions with different concentration of iron salts were used to swell the gels.
The effect of both the network composition and the concentration of iron salts in the swollen polymers on the final structure and properties of the dried magnetic polymers were
studied. The investigation was carried out by means of electron diffraction, X-ray diffraction, vibrating sample magnetometry, small angle X-ray scattering and transmission electron microscopy. The coercivity of the magnetic composites prepared was close to zero and they provided super-paramagnetic properties. The decrease of the acrylamide content in
the polymer gel and of the iron salts concentration in the swelling aqueous solution leads
to the formation of amorphous particles of iron oxide. The average sizes of the magnetite
nanoparticles obtained are compared.