Patterning electro-osmotic flow with patterned surface charge

被引:282
作者
Stroock, AD [1 ]
Weck, M [1 ]
Chiu, DT [1 ]
Huck, WTS [1 ]
Kenis, PJA [1 ]
Ismagilov, RF [1 ]
Whitesides, GM [1 ]
机构
[1] Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA
关键词
D O I
10.1103/PhysRevLett.84.3314
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
This Letter reports the measurement of electro-osmotic flows (EOF) in microchannels with surface charge patterned on the 200 mu m scale. We have investigated two classes of patterns: (1) Those in which the surface charge varies along a direction perpendicular to the electric field used to drive the EOF; this type of pattern generates multidirectional flow along the direction of the field. (2) Those in which the surface charge pattern varies parallel to the field; this pattern generates recirculating cellular flew, and thus causes motion both parallel and perpendicular to the external field. Measurements of both of these flours agree well with theory in the Limit of thin double layers and low surface potential.
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页码:3314 / 3317
页数:4
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