Regensburg 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.105: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

Invetigatins on the self assembly process of Octacosan-1-ol and its derivates on artificial surfaces — •Alexander Hommes and Klaus Wandelt — Institut für Theoretische und Physikalische Chemie, Wegelerstr. 12, 53115 Bonn

Waxes occur on the surfaces of all land plants. That the structure of epicuticular wax crystallites is predominantly a process of self-assembly, is now well established both from correlative and generic observations. The waxes are embedded into the 3D matrix of the cuticle and also cover the surface where they build plant specific microcrystalline structures. Dominant wax components are normally considered to be responsible for the formation of wax crystallites. In general, across a wide variety of waxy components like alkanes, alcohols, ketons and aldehyds, several different crystal structures on plant cuticles can be observed.

Long chained alkanes and alcohols were some of the first hydrocarbons to be imaged at solution/solid interface with AFM and STM since they form well ordered films on graphite near room temperature. Investigations on the physisorbed monolayers of Octacosan-1-ol, Hentricontan-16-on (Palmiton), Octacosanoicacid and Triacontan-1-ol at the solution/solid interface on HOPG, Mica and Siliconoxid show an order, e.g. strictly follow the hexagonal arrangement of the carbon atoms of the HOPG.(studied with STM and AFM) The good lattice match between the alkyl backbone and the graphite lattice favours commensurate packing of the hydrocarbon film with the underlying substrate.