Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.84: Poster
Mittwoch, 13. März 2013, 18:15–21:45, Poster B1
Scanning tunneling microscopy (STM) studies on the self-assembly of a twin monomer at the liquid-solid interface controlled by sonication time. A first step to the study of twin polymerization — Nguyen Doan Chau Yen1, •Nguyen Thi Ngoc Ha1, Patrick Kempe2, Stefan Spange2, and Michael Hietschold1 — 1Institute of Physics, Solid Surfaces Analysis Group, Chemnitz University of Technology, D-09107 Chemnitz, Germany — 2Institute of Chemistry, Polymer Chemistry Group, Chemnitz University of Technology, D-09111 Chemnitz, Germany
Twin polymerization has been used as an elegant method for synthesizing nanostructured hybrid materials.Twin polymerization is a polymerization process which creates two different polymers out of a so-called twin monomer.The polymerization of a monomer 2,2*-spirobi[4H-132-benzodioxasiline](SBS)is initiated by cleavage of the Si-O-C bonds. Here self-assembly of this SBS at the undecanol/HOPG interface is investigated by STM. It reveals a co-adsorption of SBS and undecanol solvent molecules in a regular pattern at ambient conditions. The non-planar twin monomer can be clearly identified in the linear pattern with undecanol molecules oriented with their zig-zag plane orthogonally to the HOPG surface. Sonication has been proven to be a simple and powerful method to control the polymorphism of molecular adsorbates out of a solution.It is demonstrated that by sonicating SBS/undecanol solutions with different sonication time the co-adsorption of SBS and undecanol on HOPG can be controlled.