Dispensing picoliter droplets on substrates using dielectrophoresis

被引:53
作者
Ahmed, R. [1 ]
Jones, T. B. [1 ]
机构
[1] Univ Rochester, Dept Elect & Comp Engn, Rochester, NY 14627 USA
关键词
dielectrophoresis; capillary instability; droplet dispensing; microfluidics;
D O I
10.1016/j.elstat.2005.10.008
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Liquid dielectrophoresis is exploited to initiate rapid, transient flow of aqueous liquids along co-planar electrodes patterned on insulating substrates. The flow induced by the non-uniform electric field leads to a new electrostatic equilibrium. A reduced-order model predicts the transient motion of the rivulet. When the field is removed, capillary instability breaks up the rivulet into regularly spaced droplets. Periodic circular bumps patterned on the structure, when spaced according to the most unstable wavelength based on Rayleigh's inviscid theory for the cylindrical liquid jet, lead to uniformly spaced and sized droplets. A correction factor, based on the dimensionless Ohnesorge number, accounts successfully for the effect of viscosity. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:543 / 549
页数:7
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