Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-5342
Main Title: Pickering emulsions stabilized by stacked catanionic micro-crystals controlled by charge regulation
Author(s): Schelero, Natascha
Stocco, Antonio
Möhwald, Helmuth
Zemb, Thomas
Type: Article
Language Code: en
Abstract: In this paper the mechanism behind the stabilization of Pickering emulsions by stacked catanionic micro-crystals is described. A temperature-quench of mixtures of oppositely charged surfactants (catanionics) and tetradecane from above the chain melting temperature to room temperature produces stable oil-in-water (o/w) Pickering emulsions in the absence of Ostwald ripening. The oil droplets are decorated by stacks of crystalline discs. The stacking of these discs is controlled by charge regulation as derived from conductivity, scattering and zeta potential measurements. Catanionic nanodiscs are ideal solid particles to stabilize Pickering emulsions since they present no density difference and a structural surface charge which is controlled by the molar ratio between anionic and cationic components. The contact angle of catanionic nanodiscs at a water/oil interface is also controlled by the non-stoichiometry of the components. The resulting energy of adhesion and the repulsion between droplets is much larger than kT. As a consequence of these unique properties of nanodiscs, this type of emulsions presents an extremely high resistance towards coalescence and creaming, even in the presence of salt.
URI: http://depositonce.tu-berlin.de/handle/11303/5722
http://dx.doi.org/10.14279/depositonce-5342
Issue Date: 2011
Date Available: 30-Jun-2016
DDC Class: 530 Physik
Usage rights: Terms of German Copyright Law
Journal Title: Soft matter
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 7
Issue: 22
Publisher DOI: 10.1039/c1sm05689a
Page Start: 10694
Page End: 10700
EISSN: 1744-6848
ISSN: 1744-683X
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:Technische Universität Berlin » Fakultäten & Zentralinstitute » Fakultät 2 Mathematik und Naturwissenschaften » Institut für Chemie » Publications

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