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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14249
Title: Preparation and characterization of ellipsoidal-shaped thermosensitive microgel colloids with tailored aspect ratios
Authors: Crassous J.J.
Dietsch H.
Pfleiderer P.
Malik, Vivek K.
Diaz A.
Hirshi L.A.
Drechsler M.
Schurtenberger P.
Published in: Soft Matter
Abstract: Prolate model colloids with defined properties can be obtained by the stretching of spherical polymeric particles, which is well-known for polystyrene and poly(methyl methacrylate) latices. The present study aims to extend this approach to functional core-shell particles in order to achieve a new class of anisotropic colloidal materials where both the aspect ratio and the effective volume fraction can be controlled by temperature. We describe the synthesis and characterization of these functional anisotropic core-shell particles consisting of a polystyrene (PS) core onto which a crosslinked thermoresponsive microgel shell of poly(N-isopropylmethacrylamide) (PNIPMAm) was grafted. Embedded into a film of polyvinylalcohol (PVA), the spherical composite microgels are heated above the glass transition temperature (T g) of the polystyrene core and then stretched with different deformations γ. During the stretching, the particles adopt an elongated shape, that they retain after cooling to room temperature as confirmed by small-angle X-ray scattering performed on the films. Anisotropic composite microgels with aspect ratios ranging from 2.2 to 6.5 are recovered after dissolution of the PVA and purification, and are fully characterized by diverse methods such as transmission electron microscopy, confocal microscopy and light scattering. The temperature sensitivity of these anisotropic composite microgels is maintained as confirmed by dynamic light scattering and cryogenic electron microscopy performed below and above the volume phase transition of the shell. © 2012 The Royal Society of Chemistry.
Citation: Soft Matter (2012), 8(13): 3538-3548
URI: https://doi.org/10.1039/c2sm07257b
http://repository.iitr.ac.in/handle/123456789/14249
Issue Date: 2012
ISSN: 1744683X
Author Scopus IDs: 57206462877
23097064900
15847072200
24758795000
9133733900
55078363400
26643488300
7004874512
Author Affiliations: Crassous, J.J., Adolphe Merkle Institute, University Fribourg, Route de l'Ancienne Papeterie, 1723 Marly 1, Switzerland, Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, 22100 Lund, Sweden
Dietsch, H., Adolphe Merkle Institute, University Fribourg, Route de l'Ancienne Papeterie, 1723 Marly 1, Switzerland
Pfleiderer, P., Department of Chemical Engineering, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium
Malik, V., Adolphe Merkle Institute, University Fribourg, Route de l'Ancienne Papeterie, 1723 Marly 1, Switzerland
Diaz, A., Paul Scherrer Institute 5232, Villigen PSI, Switzerland
Hirshi, L.A., Adolphe Merkle Institute, University Fribourg, Route de l'Ancienne Papeterie, 1723 Marly 1, Switzerland
Drechsler, M., Makromolekular Chemistry II, Bayreuth University, 95440 Bayreuth, Germany
Schurtenberger, P., Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, 22100 Lund, Sweden
Corresponding Author: Crassous, J.J.; Adolphe Merkle Institute, University Fribourg, Route de l'Ancienne Papeterie, 1723 Marly 1, Switzerland; email: jerome.crassous@fkem1.lu.se
Appears in Collections:Journal Publications [PH]

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