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SYSD: Symposium SKM Dissertationspreis

SYSD 1: SKM Dissertation Prize

SYSD 1.5: Invited Talk

Monday, March 26, 2012, 13:20–13:40, EW 201

Structuring of colloidal dispersions in slit-pore confinement — •Yan Zeng — Stranski-Laboratorium, Department of Chemistry,Technical University Berlin,Germany

The structuring of colloidal particles under confinement draws more and more attention from researches nowadays due to their numerous practical applications, such as the transport of particles in channels (e.g. microfluidic devices) and stability of particles in thin films (e.g. painting). The advanced colloidal-probe atomic force microscope was used in this work which directly provides the structuring information about colloidal nanoparticles (e.g. silica nanoparticles and surfactant micelles).

This work quantitatively investigated the scaling laws of the characteristic lengths of the structuring of colloidal dispersions and tested the generality of these laws, which explained and resolved some long-lasting contradictions in literature.

It also revealed the effect of confinement on the structuring, separated from specific properties of the confining interfaces. In addition, it resolved the influence of roughness and charge of the confining interfaces on the structuring and as well provided a method to measure the effect of surface deformability on colloidal structuring.

The surface charge and rigidity of the colloids were investigated in this work. The difference of the scaling law between charged and uncharged particles under confinement shed some light on the possible influence of electrostatic repulsive force on the extend of compression.