Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Solid / liquid interfaces I
O 45.6: Talk
Wednesday, March 28, 2012, 11:45–12:00, A 060
Self-assembly of solvent molecules adsorbed on HOPG (0001) controlled by sonication time of the liquid — •Nguyen Thi Ngoc Ha1, Thiruvancheril G. Gopakumar2, and Michael Hietschold1 — 1Institute of Physics, Solid Surfaces Analysis Group, Chemnitz University of Technology, D-09107 Chemnitz, Germany. — 2Institut für Experimentelle und Angewandte Physik der Universität Kiel, Olshausenstr.40, D-24098 Kiel, Germany
Self-assembly at the liquid-solid interface depends on several experimental parameters such as temperature, chemical nature of the solvent, functional groups of the solute molecule, etc. which can influence on the interactions between adsorbate, substrate and solvent. The molecular concentration in a solvent has been shown to be a useful control parameter for self-asssembled molecular pattern formation out of these solutions on a crystalline substrate[1,2]. Sonication treatment of the solutions has been demonstrated to be an efficient method to change these concentrations. The adsorption of TMA-alcohol mixture on a HOPG substrate has been investigated which reveals an adsorption pattern consisting of alternating stripes made of of TMA and alcohol solvent molecules which changes in dependence on sonication time[3]. Sonication of the pure alcohol solvent without any other molecules solved within also changes the assembled pattern of the solvent molecules in dependenc of sonication time as we have observed.[1]N.T.N.Ha,etal.J.Phys.Chem.C, 2010,114,3531-3536.[2]N.T.N.Ha,etal.J.Phys.Chem.C,2011,115(44),21743-21749.[3]N.T.N.Ha,etal.Coadsorption of TMA-alcohol controlled by concentration going to be submitted.