Journal article:
High elongation of polyelectrolyte chains in the osmotic limit of spherical polyelectrolyte brushes :  A study by cryogenic transmission electron microscopy

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July 13, 2005
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Drechsler, Markus
Talmon, Yeshayahu
Ballauff, Matthias
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We investigate the conformation of long polyelectrolyte chains attached to colloidal latex particles by cryogenic transmission electron microscopy (cryo-TEM). The dense grafting of the polyelectrolyte chains (“polyelectrolyte brush”) leads to a confinement of the counterions and a concomitantly high osmotic pressure within the polyelectrolyte layer attached to the core particles. Cryo-TEM has provided first model-independent direct proof for the strong stretching of the polyelectrolyte chains by direct visualization. If salt is added, cryo-TEM clearly shows how chains collapse because of the strong screening of the electrostatic interaction. Moreover, the analysis of interacting particles by cryo-TEM shows that the polyelectrolyte chains retract at close contact. Hence, we demonstrate how cryo-TEM can be used to analyze directly the spatial structure of polyelectrolyte brushes in situ.
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540 Chemistry
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Journal of the American Chemical Society ; 127 (2005), 27. - pp. 9688-9689. - ISSN 0002-7863
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ISO 690WITTEMANN, Alexander, Markus DRECHSLER, Yeshayahu TALMON, Matthias BALLAUFF, 2005. High elongation of polyelectrolyte chains in the osmotic limit of spherical polyelectrolyte brushes :  A study by cryogenic transmission electron microscopy. In: Journal of the American Chemical Society. 127(27), pp. 9688-9689. ISSN 0002-7863. Available under: doi: 10.1021/ja0513234
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@article{Wittemann2005-07-13elong-20205,
  year={2005},
  doi={10.1021/ja0513234},
  title={High elongation of polyelectrolyte chains in the osmotic limit of spherical polyelectrolyte brushes :  A study by cryogenic transmission electron microscopy},
  number={27},
  volume={127},
  issn={0002-7863},
  journal={Journal of the American Chemical Society},
  pages={9688--9689},
  author={Wittemann, Alexander and Drechsler, Markus and Talmon, Yeshayahu and Ballauff, Matthias}
}
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    <dcterms:abstract xml:lang="eng">We investigate the conformation of long polyelectrolyte chains attached to colloidal latex particles by cryogenic transmission electron microscopy (cryo-TEM). The dense grafting of the polyelectrolyte chains (“polyelectrolyte brush”) leads to a confinement of the counterions and a concomitantly high osmotic pressure within the polyelectrolyte layer attached to the core particles. Cryo-TEM has provided first model-independent direct proof for the strong stretching of the polyelectrolyte chains by direct visualization. If salt is added, cryo-TEM clearly shows how chains collapse because of the strong screening of the electrostatic interaction. Moreover, the analysis of interacting particles by cryo-TEM shows that the polyelectrolyte chains retract at close contact. Hence, we demonstrate how cryo-TEM can be used to analyze directly the spatial structure of polyelectrolyte brushes in situ.</dcterms:abstract>
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