Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Aggregation of superparamagnetic iron oxide nanoparticles in dilute aqueous dispersions: Effect of coating by double-hydrophilic block polyelectrolyte
Δημιουργός/Συγγραφέας:	Hajduová J. Uchman M. Šafařík I. Šafaříková M. Šlouf M. [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios Štěpánek M.
Εκδότης:	Elsevier B.V.
Ημερομηνία:	2015
Γλώσσα:	Αγγλικά
ISSN:	0927-7757
DOI:	10.1016/j.colsurfa.2015.07.008
Περίληψη:	Polymer-coated superparamagnetic iron oxide nanoparticles (SPION) in aqueous dispersion were prepared by the coassembly of SPION coated by an oleate bilayer with the double hydrophilic block polyelectrolyte poly[(3,5-bis(trimethylammoniummethyl)-4-hydroxystyrene iodide]-block-poly(ethylene oxide) (QNPHOS-PEO) and characterized by TEM and AFM. It was found that the coating by QNPHOS-PEO affects their aggregation into larger structures on the micrometer length scale observed by small-angle light scattering as well as the dynamics of the dispersion observed by dynamic light scattering. Oleate-SPION in aqueous dispersions form compact aggregates with the fractal dimension, D=2.4, and the characteristic size about 2μm which exhibit internal dynamics manifesting itself by the presence of the relaxation mode with τ~q-3. In the case of QNPHOS-PEO/oleate-SPION dispersions, the polyelectrolyte coating promotes the formation of compact clusters with the size of the order of ~102nm. The clusters, weakly interacting by magnetic dipolar interactions, form linear chainlike aggregates with the low fractal dimension, D=1.2. The dynamics of the QNPHOS-PEO/oleate-SPION dispersions observed by DLS is dominated by the diffusion of the clusters.
Τίτλος πηγής δημοσίευσης:	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Τόμος/Κεφάλαιο:	483
Σελίδες:	1-7
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	Aggregation Block polyelectrolytes Magnetic nanoparticles Small-angle light scattering
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2015 Elsevier B.V.
Σημειώσεις:	Technology Agency of the Czech Republic, TA ČR: TE01020118; Grantová Agentura České Republiky, GA ČR: 14-11516S
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο