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ZB 10 - Soft Condensed Matter (R. Holyst)

We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!
We are different, but we all do great Science; and we have a lot of fun doing it!

Publication

Dynamic charge separation in a liquid crystalline meniscus

Author(s): Szymborski, Tomasz and Cybulski, Olgierd and Bownik, Iwona and Andrzej and Wieczorek, Stefan A. and Fialkowski, Marcin and Holyst, Robert and Garstecki, Piotr
Title: Dynamic charge separation in a liquid crystalline meniscus
Abstract: Oscillating electric fields can sustain a macroscopic and steady of electrostatic charges. The control over the dynamic charge (dyCHASE) is presented for the example of circular menisci of free standing smectic films. These films are subject to an alternating radial electric field. The boundaries of the become charged and unstable in the electric field and deform pulsating, flower-like shapes. This instability ensues only at of the electric field that are lower than a critical one. critical frequency is a linear function of the strength of the field. Since the speed of electrophoretic drift of ions is also related to the strength of the field, the linear relation critical frequency and the amplitude of the field sets a length scale in the system. We postulate that dyCHASE is to (i) electrophoretic motion of ions in the liquid crystalline (LC) (ii) microscopic separation of charges over distances similar in to the Debye screening length, and (iii) further, macroscopic of charges through an electrohydrodynamic instability. the electrophoretic motion of ions couples with the motion of the LC material that can be observed with the use of simple optical microscopy.
Pages: 2352-2360
Journal: SOFT MATTER
Volume: 5
ID: ISI:000266798200004
Year: 2009
DOI: 10.1039/b811561c