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O: Fachverband Oberflächenphysik
O 40: Solid-Liquid Interfaces
O 40.10: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
COMPARING THE INFLUECNE OF CONCENTRATION CONTROL BY STIRRING OR SONICATING ON THE SELF-ASSEMBLY AT THE LIQUID-SOLID INTERFACE — •Nguyen Thi Ngoc Ha1, Nguyen Doan Chau Yen1, Kathrin Allmaier1, Thiruvancheril G. Gopakumar2, and Michael Hietschold1 — 1Institute of Physics, Solid Surfaces Analysis Group,Technische Universität Chemnitz, Germany — 2Indian Institute of Technology, Kanpur 208016, India
Sonication has been successfully applied to change concentrations in organic solutions and this way to engineer different self-assembled molecular structures. We have demonstrated this using trimesic acid solved in different solvents: phenyloctane,[1] alkanoic acids[2,3] and alcohols[3]. Nevertheless there raised some fears that sonication might also chemically influence on these solutions. Therefore we compare here sonication and stirring as two different methods to increase concentration. We demonstrate here that stirring leads to the same series of adsorption pattern as obtained using sonication. The only difference seems to be that stirring times are much larger than corresponding sonication times to obtain the same structures. The corresponding self-assembled structures of TMA in those solvents (phenyloctane, octanoic acids and undecanol solvents) have been monitored by the ambient STM. The study demonstrates the key role of the external control parameter concentration via very simple methods: sonication or stir in the self-assembly.