Issue 48, 2012
From the journal:

Soft Matter

Lyotropic phase behavior of polymer-coated iron oxide nanoparticles†

Sara Mehdizadeh Taheri,*a   Steffen Fischer,a   Martin Trebbin,a   Sebastian With,a   Jan H. Schröder,a   Jan Perlich,b   Stephan V. Rothb  and  Stephan Förstera  

* Corresponding authors

a Universität Bayreuth, Universitätsstrasse 30, Bayreuth, Germany
E-mail: sara.mehdizadeh.taheri@uni-bayreuth.de, stephan.foerster@uni-bayreuth.de
Fax: +49 921-55-2780
Tel: +49 921-55-3924

b HASYLAB at DESY, Notkestrasse 85, Hamburg, Germany
E-mail: stephan.roth@desy.de, jan.perlich@desy.de
Fax: +49 40 8994 2934
Tel: +49 40 8998 2934

Abstract

We show that monodisperse iron oxide nanoparticles in the size range of 6–17 nm, coated with brush-like layers of polystyrene or polyisoprene of different molecular weights, form well-defined lyotropic liquid crystalline phases. The lyotropic phase behaviour was investigated by synchrotron small-angle X-ray scattering. With increasing concentration, the polymer-coated nanoparticles show a disorder–order transition into well ordered bcc- or fcc-phases, depending on nanoparticle size and polymer molecular weights. The lyotropic phases can be shear oriented to obtain macroscopic highly ordered single crystalline nanoparticle superlattices exhibiting more than 100 Bragg-peaks. Within the ordered phases, the distance between adjacent nanoparticles can be varied systematically via concentration and attached polymer molecular weights in a range of 10–40 nm. We further demonstrate the versatility of lithographically patterned microstructured sample holders in combination with microfocus X-ray beams, which allow the investigation of very small sample volumes.

Graphical abstract: Lyotropic phase behavior of polymer-coated iron oxide nanoparticles

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Article information

DOI
https://doi.org/10.1039/C2SM26777B
Article type
Paper
Submitted
01 Aug 2012
Accepted
18 Sep 2012
First published
15 Oct 2012

Soft Matter, 2012,8, 12124-12131

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Lyotropic phase behavior of polymer-coated iron oxide nanoparticles

S. M. Taheri, S. Fischer, M. Trebbin, S. With, J. H. Schröder, J. Perlich, S. V. Roth and S. Förster, Soft Matter, 2012, 8, 12124 DOI: 10.1039/C2SM26777B

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