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Preparation and characterization of ellipsoidal-shaped thermosensitive microgel colloids with tailored aspect ratios

Crassous, Jerome LU ; Dietsch, Herve; Pfleiderer, Patrick; Malik, Vikash; Diaz, Ana; Hirshi, Liliane Ackermann; Drechsler, Markus and Schurtenberger, Peter LU (2012) In Soft Matter 8(13). p.3538-3548
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... (More)
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 g. 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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
8
issue
13
pages
3538 - 3548
publisher
Royal Society of Chemistry
external identifiers
  • wos:000301198100006
  • scopus:84858042475
ISSN
1744-6848
DOI
10.1039/c2sm07257b
language
English
LU publication?
yes
id
ffb18221-dda8-41f3-ab83-29dd1b0d5eec (old id 2517494)
date added to LUP
2012-05-15 07:26:37
date last changed
2017-11-12 03:48:59
@article{ffb18221-dda8-41f3-ab83-29dd1b0d5eec,
  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 g. 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.},
  author       = {Crassous, Jerome and Dietsch, Herve and Pfleiderer, Patrick and Malik, Vikash and Diaz, Ana and Hirshi, Liliane Ackermann and Drechsler, Markus and Schurtenberger, Peter},
  issn         = {1744-6848},
  language     = {eng},
  number       = {13},
  pages        = {3538--3548},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Preparation and characterization of ellipsoidal-shaped thermosensitive microgel colloids with tailored aspect ratios},
  url          = {http://dx.doi.org/10.1039/c2sm07257b},
  volume       = {8},
  year         = {2012},
}