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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Poster: Interfaces and Thin Films
CPP 14.17: Poster
Montag, 22. März 2010, 16:30–18:00, Poster C
How do co- and counter ions affect thin aqueous films? — •Natascha Schelero and Regine v. Klitzing — Stranski-Laboratorium, Institut für Chemie, TU Berlin, Germany
The specific effects of electrolytes are omnipresent in all systems and processes based on liquid water. For instance the question arises, why salty water is foaming in a more pronounced way than salt free water. Therefore, the effect of addition of different types of salt on the (de)stability and functionality of single thin aqueous films (foam films) is of interest.1,2 Within this work the stability and the interactions between film surfaces is determined in a so-called thin film pressure balance (TFPB).This apparatus is normally used to investigate free-standing symmetrical foam films. In recent studies our group showed that a TFPB also can be used for the investigation of wetting films (air/ water/ solid)3. This method has been successfully used to proof negative charges at the air water interface.1,4 Further on, we will present a new insight into ion specific effects in foam films and wetting films.
[1] K. Ciunel, M. Armélin, G.H. Findenegg, R. v. Klitzing, Langmuir 2005, 21, 4790 [2] C.L. Henry, C.N. Dalton, L.Scruton, V.S.J. Craig, J. Phys. Chem. C 2007, 111, 1015 [3] R. v. Klitzing, Adv. Coll. Interf. Sci. 2005, 114/115, 253 [4] K. Hänni-Ciunel, N. Schelero, R. v. Klitzing, Faraday Discussion, 2009, 141, 41