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Titel: Self-Assembly of Large Magnetic Nanoparticles in Ultrahigh Molecular Weight Linear Diblock Copolymer Films
VerfasserIn: Cao, Wei
Xia, Senlin
Jiang, Xinyu
Appold, Michael
Opel, Matthias
Plank, Martina
Schaffrinna, Roy
Kreuzer, Lucas P.
Yin, Shanshan
Gallei, Markus
Schwartzkopf, Matthias
Roth, Stephan V.
Müller-Buschbaum, Peter
Sprache: Englisch
Titel: ACS applied materials & interfaces
Bandnummer: 12
Heft: 6
Startseite: 7557
Endseite: 7564
Verlag/Plattform: ACS
Erscheinungsjahr: 2020
Freie Schlagwörter: large iron oxide nanoparticles
ultrahigh molecular weight linear diblock copolymer
localization of NPs
GISAXS
ferrimagnetic behavior
DDC-Sachgruppe: 540 Chemie
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: The development of diblock copolymer (DBC) nanocomposite films containing magnetic nanoparticles (NPs) with diameters (D) over 20 nm is a challenging task. To host large iron oxide NPs (Fe3O4, D = 27 ± 0.6 nm), an ultrahigh molecular weight (UHMW) linear DBC polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) is used as a template in the present work. Due to hydrogen bonding between the carboxylic acid ligands of the NPs and the ester groups in PMMA, the NPs show an affinity to the PMMA block. The localization of the NPs inside the DBC is investigated as a function of the NP concentration. At low NP concentrations, NPs are located preferentially at the interface between PS and PMMA domains to minimize the interfacial tension caused by the strong segregation strength of the UHMW DBC. At high NP concentrations (≥10 wt %), chain-like NP aggregates (a head-to-tail orientation) are observed in the PMMA domains, resulting in a change of the morphology from sphere to ellipsoid for part of the PMMA domains. Magnetic properties of the hybrid films are probed via superconducting quantum interference device magnetometry. All hybrid films show ferrimagnetism and are promising for potential applications in magnetic data storage.
DOI der Erstveröffentlichung: 10.1021/acsami.9b20905
URL der Erstveröffentlichung: https://pubs.acs.org/doi/10.1021/acsami.9b20905
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-371355
hdl:20.500.11880/33702
http://dx.doi.org/10.22028/D291-37135
ISSN: 1944-8252
1944-8244
Datum des Eintrags: 1-Sep-2022
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Prof. Dr. Markus Gallei
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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