Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: INTERNAL SYMPOSIUM Scattering Experiments II

CPP 11.2: Talk

Tuesday, March 27, 2007, 14:30–14:45, H37

X-ray reflectivity study of the adsorption of azacrown ethers and palmitic acid at the hexane-water interface — •Gutberlet Thomas¹, Wojciechowski Kamil², Tikhonov Alexey³, Schlossman Mark⁴, and Buffle Jacques² — ¹Lab. f. Neutr. Scattering, ETHZ & PSI, 5232 Villigen PSI, Switzerland — ²CABE, Dept. of Anal., Inorg. and Appl. Chem., University of Geneva, 1211 Geneva 4, Switzerland — ³NSLS, Upton, NY, USA — ⁴Dept. of Phys. and Chem., University of Illinois, Chicago, IL, USA

Azacrown ethers substituted with different alkyl chain length (decyl, palmitoyl, tetracosanoyl) and palmitic acid have been investigated at the aqueous-organic hexane-water interface by means of x-ray reflectivity. These systems are of interest in Permeation Liquid Membrane techniques to separate aqueous solutions by a hydrophobic membrane to select chemical species. The x-ray reflectivity measurements reveal the presence of a dense interfacial layer at the hexane-water interface. The longer alkyl chain substituted azacrown ethers show a diminished interfacial roughness. Here, the experimental set-up and results will be presented in detail and discussed.