Band Formation in Mixtures of Oppositely Charged Colloids Driven by an ac Electric Field

被引：71
|
作者：
Vissers, Teun [1 ]
van Blaaderen, Alfons [1 ]
Imhof, Arnout [1 ]
机构：
[1] Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CC Utrecht, Netherlands
来源：
PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 22期
关键词：
PATTERN-FORMATION; ORGANIZATION; PARTICLES;
D O I：
10.1103/PhysRevLett.106.228303
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present experiments on pattern formation in a Brownian system of oppositely charged colloids driven by an ac electric field. Using confocal laser scanning microscopy we observe complete segregation of the two particle species into bands perpendicular to a field of sufficient strength when the frequency is in a well-defined range. Because of its Brownian nature the system spontaneously returns to the equilibrium mixture after the field is turned off. We show that band formation is linked to the time scale associated with collisions between particles moving in opposite directions.
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页数：4
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