Electrohydrodynamic Structuring of Colloidal Particles on Leaky Dielectric Drops
This Master's thesis shows experimentally how colloidal particles in leaky
dielectric liquid drops are actively structured by applying a DC electric eld.
Colloidal particles in small droplets with a diameter of 100 m show similar
structuring to what has previously been observed on bigger drops (1 mm),
showing ribbon formation, spinning domains and pupil eects. It is shown
how electrohydrodynamic assembly of colloidal particles on a drop surface
depends on the electric eld strength, and how this enables fast assembly of
the particles. The particles used in the experiments are clay particles, layered
double hydroxides and insulating beads. The layered double hydroxides show
similar structuring to the clay particles. The results suggest that active con-
trol of colloidal particles on leaky-dielectric drops by an electric eld can lead
to new ways of producing Janus shells and other 'smart armoured' droplets.
Place, publisher, year, edition, pages
Institutt for fysikk , 2013. , 93 p.
IdentifiersURN: urn:nbn:no:ntnu:diva-23482Local ID: ntnudaim:10198OAI: oai:DiVA.org:ntnu-23482DiVA: diva2:664687
Fossum, Jon Otto, ProfessorCarvalho, Marcio