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A new route towards colloidal molecules with externally tunable interaction sites.

Månsson, Linda LU ; Immink, Jasper LU ; Mihut, Adriana LU ; Schurtenberger, Peter LU and Crassous, Jerome LU (2015) In Faraday Discussions 181(Online 15 January 2015). p.49-69
Abstract
We describe a route towards self-assembled colloidal molecules, where thermoresponsive microgels serve as discrete, externally tunable interaction sites. The ability of poly(N-isopropylacrylamide) (PNIPAM) and poly(N-isopropylmethacrylamide) (PNIPMAM) microgels to adsorb to the oil/water (O/W) interface and create Pickering-stabilized mini-emulsions was first tested using the controlled addition of sub-micron-sized polydimethylsiloxane (PDMS) oil droplets to a microgel suspension. The use of a mixture of PNIPAM and PNIPMAM microgels differing in size and fluorescent labeling then resulted in the formation of thermosensitive patchy particles, where the patches can be visualised using fluorescence confocal laser scanning microscopy. The size... (More)
We describe a route towards self-assembled colloidal molecules, where thermoresponsive microgels serve as discrete, externally tunable interaction sites. The ability of poly(N-isopropylacrylamide) (PNIPAM) and poly(N-isopropylmethacrylamide) (PNIPMAM) microgels to adsorb to the oil/water (O/W) interface and create Pickering-stabilized mini-emulsions was first tested using the controlled addition of sub-micron-sized polydimethylsiloxane (PDMS) oil droplets to a microgel suspension. The use of a mixture of PNIPAM and PNIPMAM microgels differing in size and fluorescent labeling then resulted in the formation of thermosensitive patchy particles, where the patches can be visualised using fluorescence confocal laser scanning microscopy. The size of the assembled decorated droplets and the number of adsorbed microgels was further reduced using an in situ synthesis approach, where the oil droplets are directly synthesised in the presence of microgels. This results in the formation of highly monodisperse microgel-decorated PDMS oil droplets with a small number of microgels adsorbed to the droplet interface. We demonstrate that we can use temperature to change the interaction potential between these interaction sites and thus trigger a reversible association of the individual decorated droplets at temperatures above the volume phase transition temperature TVPT of the microgels. Finally, we investigated the temporal evolution of the decorated droplets and found that small and well-defined clusters of microgels form in the early stages of the process primarily through the action of capillary forces. These clusters mimic colloidal molecules with a small number of discrete and thermosensitive binding sites. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Faraday Discussions
volume
181
issue
Online 15 January 2015
pages
49 - 69
publisher
Royal Society of Chemistry
external identifiers
  • pmid:25969843
  • wos:000358348400005
  • scopus:84937710244
ISSN
1364-5498
DOI
10.1039/c4fd00267a
language
English
LU publication?
yes
id
079b75fd-4271-4c22-841d-e9334f8348d6 (old id 5453264)
date added to LUP
2015-06-23 17:35:53
date last changed
2017-02-19 03:03:21
@article{079b75fd-4271-4c22-841d-e9334f8348d6,
  abstract     = {We describe a route towards self-assembled colloidal molecules, where thermoresponsive microgels serve as discrete, externally tunable interaction sites. The ability of poly(N-isopropylacrylamide) (PNIPAM) and poly(N-isopropylmethacrylamide) (PNIPMAM) microgels to adsorb to the oil/water (O/W) interface and create Pickering-stabilized mini-emulsions was first tested using the controlled addition of sub-micron-sized polydimethylsiloxane (PDMS) oil droplets to a microgel suspension. The use of a mixture of PNIPAM and PNIPMAM microgels differing in size and fluorescent labeling then resulted in the formation of thermosensitive patchy particles, where the patches can be visualised using fluorescence confocal laser scanning microscopy. The size of the assembled decorated droplets and the number of adsorbed microgels was further reduced using an in situ synthesis approach, where the oil droplets are directly synthesised in the presence of microgels. This results in the formation of highly monodisperse microgel-decorated PDMS oil droplets with a small number of microgels adsorbed to the droplet interface. We demonstrate that we can use temperature to change the interaction potential between these interaction sites and thus trigger a reversible association of the individual decorated droplets at temperatures above the volume phase transition temperature TVPT of the microgels. Finally, we investigated the temporal evolution of the decorated droplets and found that small and well-defined clusters of microgels form in the early stages of the process primarily through the action of capillary forces. These clusters mimic colloidal molecules with a small number of discrete and thermosensitive binding sites.},
  author       = {Månsson, Linda and Immink, Jasper and Mihut, Adriana and Schurtenberger, Peter and Crassous, Jerome},
  issn         = {1364-5498},
  language     = {eng},
  number       = {Online 15 January 2015},
  pages        = {49--69},
  publisher    = {Royal Society of Chemistry},
  series       = {Faraday Discussions},
  title        = {A new route towards colloidal molecules with externally tunable interaction sites.},
  url          = {http://dx.doi.org/10.1039/c4fd00267a},
  volume       = {181},
  year         = {2015},
}