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Asymmetric self-assembly of oppositely charged composite microgels and gold nanoparticles

Crassous, Jerome J.; Millard, Pierre-Eric; Mihut, Adriana M.; Polzer, Frank; Ballauff, Matthias LU and Schurtenberger, Peter (2012) In Soft Matter 8(5). p.1648-1656
Abstract
The electrostatically driven self-assembly of oppositely charged gold nanoparticles (Au NPs) and polystyrene/poly(N-isopropylacrylamide) (PS/PNIPAm) core-shell microgels (CSMs) has been investigated. The co-assembly was accomplished by addition of smaller Au NPs to CSMs in dilute conditions up to a number ratio of about 1 : 1, when the suspension is destabilized. A combination of different techniques (i.e. turbidimetric titration, electrophoretic mobility, UV-visible spectroscopy, dynamic light scattering and microscopy techniques) were used to investigate the association between the two particles and the stability of the different mixtures. Hereby we demonstrate that the size ratio between the two particles (about 4 to 1) and the... (More)
The electrostatically driven self-assembly of oppositely charged gold nanoparticles (Au NPs) and polystyrene/poly(N-isopropylacrylamide) (PS/PNIPAm) core-shell microgels (CSMs) has been investigated. The co-assembly was accomplished by addition of smaller Au NPs to CSMs in dilute conditions up to a number ratio of about 1 : 1, when the suspension is destabilized. A combination of different techniques (i.e. turbidimetric titration, electrophoretic mobility, UV-visible spectroscopy, dynamic light scattering and microscopy techniques) were used to investigate the association between the two particles and the stability of the different mixtures. Hereby we demonstrate that the size ratio between the two particles (about 4 to 1) and the asymmetric character of the association result in the formation of electrostatic hybrid complexes, analogous to dipolar colloidal molecules, which further rearrange into finite sized clusters for number ratios N(AuNPs)/N(CSMs) < 1. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
8
issue
5
pages
1648 - 1656
publisher
Royal Society of Chemistry
external identifiers
  • wos:000298990600049
  • scopus:84855715713
ISSN
1744-6848
DOI
10.1039/c1sm06828h
language
English
LU publication?
yes
id
ee495add-f08d-461a-9e5f-d9b3b7e30984 (old id 2362442)
date added to LUP
2012-02-23 14:37:39
date last changed
2017-05-28 04:12:42
@article{ee495add-f08d-461a-9e5f-d9b3b7e30984,
  abstract     = {The electrostatically driven self-assembly of oppositely charged gold nanoparticles (Au NPs) and polystyrene/poly(N-isopropylacrylamide) (PS/PNIPAm) core-shell microgels (CSMs) has been investigated. The co-assembly was accomplished by addition of smaller Au NPs to CSMs in dilute conditions up to a number ratio of about 1 : 1, when the suspension is destabilized. A combination of different techniques (i.e. turbidimetric titration, electrophoretic mobility, UV-visible spectroscopy, dynamic light scattering and microscopy techniques) were used to investigate the association between the two particles and the stability of the different mixtures. Hereby we demonstrate that the size ratio between the two particles (about 4 to 1) and the asymmetric character of the association result in the formation of electrostatic hybrid complexes, analogous to dipolar colloidal molecules, which further rearrange into finite sized clusters for number ratios N(AuNPs)/N(CSMs) &lt; 1.},
  author       = {Crassous, Jerome J. and Millard, Pierre-Eric and Mihut, Adriana M. and Polzer, Frank and Ballauff, Matthias and Schurtenberger, Peter},
  issn         = {1744-6848},
  language     = {eng},
  number       = {5},
  pages        = {1648--1656},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Asymmetric self-assembly of oppositely charged composite microgels and gold nanoparticles},
  url          = {http://dx.doi.org/10.1039/c1sm06828h},
  volume       = {8},
  year         = {2012},
}