Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-02-05
Langmuir Vol 23, 8028 (2007).
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 8 figures
Scientific paper
We calculate the meniscus location in tapered capillaries under the influence of pressure difference and dielectrophoretic forces with and without gravity. We find that the meniscus location can be a discontinuous function of the pressure difference or the applied voltage and that the meniscus can ``jump'' to one end or another of the capillary. Phase diagrams are given as a function of the pressure and voltage, depending on the geometrical parameters of the system. We further consider a revision of the dielectric rise under dielectrophoretic force in wedge capillaries and in the case of electrowetting, where the dielectrophoretic force is a small perturbation. Finally, we also find discontinuous liquid--gas interface location in the case of liquid penetration into closed volumes.
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