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Título

Arrangement of Maghemite Nanoparticles via Wet Chemical Self-Assembly in PS- b -PNIPAM Diblock Copolymer Films

AutorYao, Yuan; Metwalli, Ezzeldin; Su, Bo; Körstgens, Volker; Moseguí González, Daniel; Miasnikova, Anna; Laschewsky, Andre; Opel, Matthias; Santoro, Gonzalo CSIC ORCID ; Roth, Stephan V.; Müller-Buschbaum, Peter
Palabras claveMaghemite nanoparticles
Block copolymer
Nanocomposites
Hybrid films
GISAXS
Fecha de publicación17-jun-2015
EditorAmerican Chemical Society
CitaciónACS Applied Materials and Interfaces 7(23): 13080-13091 (2015)
ResumenThe structure and magnetic behavior of hybrid films composed of maghemite (-Fe<inf>2</inf>O<inf>3</inf>) nanoparticles (NPs) and an asymmetric diblock copolymer (DBC) polystyrene<inf>61</inf>-block-polyN-isopropylacrylamide<inf>115</inf> are investigated. The NPs are coated with PS chains, which allow for a selective incorporation inside the PS domains at different NP concentrations. Upon incorporation of low amounts of NPs into the DBC thin films, the initial parallel (to film surface) cylinder morphology changes to a well ordered, perpendicularly oriented one. The characteristic domain distance of the DBC is increased due to the swelling of the PS domains with NPs. At higher NP concentrations, the excess NPs which can no longer be embedded in the PS domains, are accumulated at the film surface, and NP aggregates form. Irrespective of NP concentration, a superparamagnetic behavior of the metal oxide-DBC hybrid films is found. Such superparamagnetic properties make the established hybrid films interesting for high density magnetic storage media and thermoresponsive magnetic sensors.
Versión del editorhttps://doi.org/10.1021/acsami.5b03308
URIhttp://hdl.handle.net/10261/182778
DOI10.1021/acsami.5b03308
Identificadoresdoi: 10.1021/acsami.5b03308
e-issn: 1944-8252
issn: 1944-8244
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