Nanocomposites of Highly Monodisperse Encapsulated Superparamagnetic Iron Oxide Nanocrystals Homogeneously Dispersed in a Poly(ethylene Oxide) Melt

• Published in: ACS nano Vol. 11; no. 4; pp. 3767 - 3775
• Main Authors: Feld, Artur, Koll, Rieke, Fruhner, Lisa Sarah, Krutyeva, Margarita, Pyckhout-Hintzen, Wim, Weiß, Christine, Heller, Hauke, Weimer, Agnes, Schmidtke, Christian, Appavou, Marie-Sousai, Kentzinger, Emmanuel, Allgaier, Jürgen, Weller, Horst
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 25.04.2017
• Subjects: encapsulation; cross-linking; diblock copolymer; nanocomposite; iron oxide nanocrystals; hybrid materials; thiol−ene click reaction
• ISSN: 1936-0851; 1936-086X
• DOI: 10.1021/acsnano.6b08441

Nanocomposite materials based on highly stable encapsulated superparamagnetic iron oxide nanocrystals (SPIONs) were synthesized and characterized by scattering methods and transmission electron microscopy (TEM). The combination of advanced synthesis and encapsulation techniques using different diblock copolymers and the thiol–ene click reaction for cross-linking the polymeric shell results in uniform hybrid SPIONs homogeneously dispersed in a poly­(ethylene oxide) matrix. Small-angle X-ray scattering and TEM investigations demonstrate the presence of mostly single particles and a negligible amount of dyads. Consequently, an efficient control over the encapsulation and synthetic conditions is of paramount importance to minimize the fraction of agglomerates and to obtain uniform hybrid nanomaterials.