Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Poster: Colloids and Complex Liquids

CPP 38.22: Poster

Wednesday, March 16, 2011, 17:00–19:00, P2

AFM study on the structuring of silica nanoparticles in confined geometries — •Yan Zeng, Sebastian Schön, and Regine von Klitzing — Stranski-Laboratorium, Department of Chemistry, TU Berlin, Strasse des 17.Juni 124, D-10623 Berlin

Colloidal suspensions are omnipresent in daily life and have many technical applications. To understand the interactions between particles in thin films of colloidal suspensions, we perform force measurements by using Colloidal Probe Atomic Force Microscopy (CP-AFM), in which particles show oscillatory force due to the layer formations of particles under spatial confinement.

Previous works have been done in the field of the effect of particle concentration, particle size and ionic strength on the structuring of the Ludox silica nanoparticles between two rigid confining surfaces. The layer-layer distance in the confined geometry is compared with the mean particle distance from the corresponding free volume case with Small Angle X-Ray Scattering (SAXS).

To understand the effect of confining surfaces properties on the structuring of the nanoparticles in between, confining surfaces are modified thus different surface charge, surface roughness and surface elasticity are obtained. In addition, the adsorption of surfactants on the surface of nanoparticles are studied as well.