Anomalous Long-Range Attraction in Colloidal Binary Mixtures at Fluid–Fluid Interfaces

Colloidal Systems with both a Short-Range Attraction and a Long-Range Repulsion

Even though the Derjaguin-Landau-Verwey-Overbeek theory has been used to describe the interactions between charged colloidal particles for over half a century, research on systems with a weak short-range attraction and long-range repulsion (SALR) has begun receiving the intensive attention from the colloidal community only very recently. Systems with a SALR interaction include micrometer sized ...

Long-ranged attraction between charged polystyrene spheres at aqueous interfaces.

We report an optical and atomic force microscopic study of interactions between charged polystyrene spheres at a water-air interface. Optical observations of bonded particle clusters and formation of circular chainlike structures at the interface demonstrate that the interaction potential is of dipole origin. Atomic force microscope phase images show patchy domains on the colloidal surface, ind...

Long-Range Attraction in Polyelectrolyte Solutions

The recently discovered attractive force between hydrophobic surfaces is incorporated in a theory of polyelectrolyte solutions. Ita influence on the second and third virial coefficients is estimated. Binary collisions between two polyions are virtually unaffected by attractive forces of long range whereas the impact on the third virial coefficient is enormous. The theoretical coefficients are c...

Colloidal particles at liquid interfaces.

Tailoring the phonon band structure in binary colloidal mixtures.

We analyze the phonon spectra of periodic structures formed by two-dimensional mixtures of dipolar colloidal particles. These mixtures display an enormous variety of complex ordered configurations [J. Fornleitner, Soft Matter 4, 480 (2008)], allowing for the systematic investigation of the ensuing phonon spectra and the control of phononic gaps. We show how the shape of the phonon bands and the...