Regulating the aggregation of colloidal particles in an electro-osmotic micropump

Aggregation of Charged Colloidal Particles

This chapter reviews the recent progress in aggregation of colloidal particles with long-range interactions, including simple colloids and polyelectrolytes. The relevant interactions between colloidal particles, including Born repulsion, van der Waals, electrostatic, structural solvation, hydrophobic hydrodynamic interactions and attraction between like-charge colloids, charge nonuniformity, an...

Aggregation of dipolar colloidal particles: geometric effects.

To understand the importance of confinement and the influence of translational degrees of freedom on aggregation of dipolar colloidal particles, we calculate numerically-exact values for the mean encounter time for two nonspherically symmetric molecules to form a two-molecule cluster, regarded here as a precursor to aggregation. A lattice model is formulated in which the asymmetry of the molecu...

Interactions and Aggregation of Colloidal Biological Particles

The separation of cells or particles from solution has traditionally been accomplished with centrifuges or by sedimentation; however, many particles have specific densities close to unity, making buoyancy-driven motion slow or negligible, but most cells and particles carry surface charges, making them ideal for electrophoretic separation. Both buoyancy-driven and electrophoretic separation may ...

Shape-Selectivity in the Aggregation of Lithographically-Designed Colloidal Particles

Photolithography can be used to form monodisperse colloids of well-defined, non-spherical shape in a negative photoresist, SU-8. In aqueous suspension, in the presence of dextran as a depletant, we showed that the aggregation of these particles was highly selective for the end-to-end configuration [1]: the cylinders assembled into linear aggregates that could extend to lengths of tens of units ...

Osmotic propulsion of colloidal particles via constant surface flux