Berlin 2012 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.46: Poster
Monday, March 26, 2012, 17:30–20:00, Poster A
The ordering of dodecyl chains and their influence on the agglomeration of zirconia nanoparticles — •Silvia Pabisch1, Bernhard Feichtenschlager2, Guido Kickelbick3, and Herwig Peterlik1 — 1University of Vienna, Faculty of Physics, Vienna, Austria — 2Vienna University of Technology, Institute for Materials Chemistry, Vienna, Austria — 3Saarland University, Inorganic Solid State Chemistry, Saarbrücken, Germany
The ordering of dodecyl chains has been investigated in mixed monolayers of phosphonic acid capping agents on the surface of hydrothermal prepared zirconia nanocrystals. As co-capping agent for the mixed monolayer formation, methyl-, phenyl-, pyryl- and tert-butyl phosphonic acid have been used to investigate series with different mixing ratios with dodecyl phosphonic acid. In this study, the influence of the various molecules on the alkyl chain disordering is discussed. Small angle X-ray scattering (SAXS) studies show that with increasing amount of co-capping agent the agglomeration of the particles decreases. This behavior correlates with the ordering of the surface bond alkyl chains investigated by Fourier transform infrared spectroscopy (FTIR). It can be concluded that interparticle bilayers, formed via long alkyl chain packing, are responsible for the formation of dense particle agglomerates and can be controlled on a molecular level by co-adsorbing various molecules. Based on this correlation nanoparticles can be used as probes for self-assembled monolayer investigation by an indirect method (SAXS) and correlated with the routine method for the chemical analysis of surface groups (FTIR).