Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 42: Friction and Lubrication
CPP 42.1: Vortrag
Donnerstag, 3. April 2014, 09:30–09:45, ZEU 114
High Resolution Force Measurements of Host-Guest Complex Interaction — •Bianca Bozna1, Johanna Blass1,2, Marcel Albrecht3, Gerhard Wenz3, and Roland Bennewitz1,2 — 1INM - Leibniz Institute for New Materials, Saarbrücken, Germany — 2Physics Department, Saarland University, Saarbrücken, Germany — 3Organic Macromolecular Chemistry, Saarbrücken, Germany
Surfaces with well-defined friction and adhesion properties such as high shearing but low peeling resistance are required for many of technical applications. We currently develop a novel surface material based on cyclodextrin assemblies with switchable friction and adhesion characteristics mediated by ditopic guest molecules. As a mandatory step towards achieving this aim, we investigate the friction forces between two surfaces functionalized with β-cyclodextrin in two different configurations. The friction measurements were performed on β-cyclodextrin modified gold surfaces in both pure water and ditopic guest solution (adamantane). The gold surface was functionalized with β-CD molecules whose thiol end groups provide a covalent bond to the substrate. The level of coverage by CD molecules on the gold surface was tested by cyclic voltammetry. Using high resolution friction force measurements we prove that the friction force between the two opposing β-cyclodextrin layers strongly increases in ditopic guest solution when compared to pure water. The long term goal of this research is to develop switchable adherent surfaces that can find applications in biotechnology or medical devices.