Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 27: Nanoparticles and Composite Materials II
CPP 27.2: Talk
Wednesday, March 13, 2013, 15:15–15:30, H39
Adhesion Forces between TiO2 Nanoparticles in Agglomerates — •Rebecca Scholz1, Samir Salameh2, and Lutz Mädler2 — 1Ruhr-Universität Bochum, Physical Chemistry I, Universitätsstraße 150, 44801 Bochum — 2Foundation Institute of Materials Science (IWT), Department of Production Engineering, University of Bremen, Badgasteiner Str. 3, 28359 Bremen
Nanoparticle aggregates and their films have wide spread applications such as catalysis, sensing, and hybrid materials. The adhesion force between the aggregates plays a major role for their functionality and influence mechanical but also chemical stability. Therefore, information on key parameters influencing the particle-particle-contact are very important. However, direct measurements of the contact forces for particles in size ranges of about 10 nm are rather challenging. Here, we present a method to determine these forces [1], which includes a statistical analysis of the force curves measured by atomic force microscopy (AFM) and in-situ measurements of the rearrangements of the nanoparticles in an AFM/TEM setup. We use this method to first clarify the question of the influence of the primary TiO2 particle size on the contact force and to then investigate the agglomerate size. In order to separate the influence of the agglomerate size we generated monodisperse agglomerates. Our results show that sliding and rolling events increase with agglomerate size. These findings, especially of the influence of the agglomerate size on the contact force, will be presented and discussed in this presentation.