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

Wittemann, Alexander; Drechsler, Markus; Talmon, Yeshayahu; Ballauff, Matthias

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

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Datum

2005

Autor:innen

Wittemann, Alexander

Drechsler, Markus

Talmon, Yeshayahu

Ballauff, Matthias

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of the American Chemical Society. 2005, 127(27), pp. 9688-9689. ISSN 0002-7863. Available under: doi: 10.1021/ja0513234

Zusammenfassung

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.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

WITTEMANN, 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. 2005, 127(27), pp. 9688-9689. ISSN 0002-7863. Available under: doi: 10.1021/ja0513234

BibTex

@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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