Journal Article

PUBDB-2015-01005

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nano- and Microstructures of Magnetic Field-Guided Maghemite Nanoparticles in Diblock Copolymer Films

Yao, Y. ; Metwalli, E. ; Niedermeier, M. A. ; Opel, M. ; Lin, C. ; Ning, J. ; Perlich, J.DESY* ; Roth, S.DESY* ; Müller-Buschbaum, P. (Corresponding Author)

2014
Soc. Washington, DC

This record in other databases:      

Please use a persistent id in citations: doi:10.1021/am500597t

Abstract: The control over the alignment of nanoparticles within a block copolymer matrix was investigated for different external magnetic fields with respect to producing well-aligned, highly oriented metal-oxide–polymer nanopatterns. Hybrid films were prepared by solution casting under a range of external magnetic fields. The nano- and microstructure of maghemite nanoparticles within poly(styrene-b-methyl methacrylate) diblock copolymer films as a function of the nanoparticle concentration was studied using optical microscopy, atomic force microscopy, scanning electron microscopy, and grazing incidence small-angle X-ray scattering. Because of a polystyrene (PS) coating, the nanoparticles are incorporated in the PS domains of the diblock copolymer morphology. At higher nanoparticle concentrations, nanoparticle aggregates perturb the block copolymer structure and accumulate at the films surface into wire-shaped stripes. These wire-shaped nanoparticle aggregates form mainly because of the competition between nanoparticle–polymer friction and magnetic dipolar interaction. The magnetic behavior of the hybrid films was probed at different temperatures for two orthogonal directions (with the line-shaped particle aggregates parallel and perpendicular to the magnetic field). The hybrid film systems show superparamagnetic behavior and remarkable shape anisotropy that render them interesting for magnetic applications.

Note: (c) American Chemical Society. Post referee full text in progress.

---

Contributing Institute(s):

1. DOOR-User (DOOR)
2. Experimentebetreuung PETRA III (FS-PE)

Research Program(s):

1. DORIS Beamline BW4 (POF2-54G13) (POF2-54G13)
2. FS-Proposal: II-20100012 (II-20100012) (II-20100012)

Experiment(s):

1. DORIS Beamline BW4 (DORIS III)

Appears in the scientific report 2014

---

Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---