AC field induced two-dimensional aggregation of multilamellar vesicles |
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Authors: | C Faure N Decoster F Argoul |
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Institution: | (1) Centre de Recherche Paul Pascal, avenue A. Schweitzer, 33600 Pessac, France, FR |
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Abstract: | The aggregation of 2D colloidal crystals can be performed by applying an AC field to a colloidal dispersion. This technique
is used in this work for assembling multilamellar vesicles in suspension. The dynamics of the aggregation is followed by real-time
recording of the pictures of the microsphere assembly through a phase contrast microscope. The influence of both the frequency
and the amplitude of the alternating field on the dynamical evolution of the concentration of layered particles is discussed
with respect to their size. A phenomenological model of double layer induced trapping of the particles is proposed and an
electroconvective instability of the fluid surrounding the particles is suggested from the observation of the local dynamics
of the particles, in accordance with a very recent argument of Yeh et al. #!Yeh:97!#].
Received: 4 December 1997 / Revised: 24 March 1998 /
Accepted: 4 May 1998 |
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Keywords: | PACS 05 70 Fh Phase transitions: general aspects - 83 70 Hq Heterogeneous liquids: suspensions dispersions emulsions pastes slurries foams block copolymers etc |
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