Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 53: Solid / liquid interfaces III

O 53.5: Talk

Wednesday, March 16, 2011, 16:00–16:15, WIL C107

co-operative adsorption of TMA-alcohol mixture controlled by sonication time — •Nguyen Thi Ngoc Ha¹, Thiruvancheril G. Gopakumar², and Michael Hietschold¹ — ¹Solid Surfaces Analysis Group, Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany — ²Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany

Trimesic acid (TMA) dissolved in alcoholic solvents shows linear pattern of straight-chain aliphatic alcohols co-adsorbed with TMA on highly oriented pyrolytic graphite (HOPG). According to literature the detailed structure of these patterns depends on the number of carbon atoms in the alkyl chain of alcohols, the so called odd-even effect. In odd alcoholic solvents, dimer rows of TMA molecules are interacting with interdigitating alcohol molecules in a nearly perpendicular (86°) manner with respect to the direction of the TMA tapes, and the alkane chains of alcohols oriented orthogonally with respect to HOPG surface. However, in aliphatic alcohols with even number of carbon atoms dimer rows of TMA interact with alcohol molecules with an angle of 64° and alcoholic molecules adsorbed parallel on HOPG surface. By adjusting the sonication time of TMA-alcohol mixture, here we show that the geometry of adsorption pattern, packing density etc. of TMA and alcohol molecules can be controlled within one type of alcoholic solvent.