TITLE

Electric field mediated droplet centering

AUTHOR(S)
Bei, Z.-M.; Jones, T. B.; Tucker-Schwartz, A.; Harding, D. R.
PUB. DATE
November 2008
SOURCE
Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p184101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Double emulsion droplets subjected to a uniform ac electric field self-assemble into highly concentric structures via the dipole/dipole force if the outer droplet has a higher dielectric constant than the suspending liquid. The dielectric constant of the inner droplet has no influence. To minimize field-induced droplet distortion, the liquids must be density matched to ∼0.1%. Centering of ∼3 to 6 mm diameter droplets is achieved within ∼60 s for field strengths of ∼104 Vrms/m in liquids of viscosity ∼10 cP. Effective centering depends strongly on frequency if the outer shell is conductive.
ACCESSION #
35279241

 

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