Nano Science and Technology Institute
Nanotech 2005 Vol. 1
Nanotech 2005 Vol. 1
Technical Proceedings of the 2005 NSTI Nanotechnology Conference and Trade Show, Volume 1
Chapter 10: Micro and Nano Fluidics Design and Phenomena

Electrokinetic and Hydrodynamic Focusing/Switching in Microfluidics

Authors:R-J Yang, C-C Chang, S-B Huang and G-B Lee
Affilation:National Cheng Kung University, TW
Pages:612 - 615
Keywords:microfluidics, injection, focusing, switching
Abstract:This paper presents an investigation on hydrodynamic/electrokinetic focusing and switching, which are crucial for microfluidic applications. The hydrodynamic/electrokinetic focusing phenomenon is first theoretically modeled by employing a potential flow theory, and this simple theoretical model is further applied to predict the width of the focused stream. Data predicted by the new theoretical model are in good agreement with experimental and numerical results as shown in Fig. 1. Hydrodynamic and electrokinetic switching is then systematically investigated experimentally and numerically. A simple control model for electrokinetically pre-focused micro flow switches is also proposed. Using this model, the sample flow can be pre-focused electrokinetically into a narrow stream and is then injected directly to desired outlet ports. Figure 2 shows the schematic design of a microfluidic chip and the experimental and numerical results are shown in Figure 3. This study provides a systematical study on analogy of hydrodynamic and electrokinetic focusing/switching and could provide a useful tool for analysis of flow control in microfluidic devices.
Electrokinetic and Hydrodynamic Focusing/Switching in MicrofluidicsView PDF of paper
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