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Title: Development of A Hydrophobicity Controlled Microfluidic Dispenser
Authors: LIU HONG
Keywords: microfluidic, dispenser, electrowettingb on-dielectric (EWOD), surface tension, hydrophobicity
Issue Date: 26-Sep-2008
Citation: LIU HONG (2008-09-26). Development of A Hydrophobicity Controlled Microfluidic Dispenser. ScholarBank@NUS Repository.
Abstract: In this project, design, fabrication and testing of a self-priming microfluidic dispenser having in-built metering feature for dispensing varying liquid column based on controlled hydrophobicity are presented. The physics of dispensing principle is based on the fluid hydrodynamics described by Navier-Stokes equation and electrowetting-on-dielectric (EWOD) effect. An electrostatic force resulted from the surface charge redistribution induced by the non-uniform electrical field is generated to modify the surface tension and pull the liquid column forward. A new hydrodynamic mathematical model of the time-averaged liquid column velocity governed by the Navier-Stokes equation is developed, which agrees well with the experimental data. The fluid flow can be electrically actuated to propagate at a flow rate of 18 nl/min under a voltage of as low as 20 V. It has an inbuilt metering feature to dispense a measured volume of liquid in the range of sub nano liters without a dedicated actuator.
Appears in Collections:Ph.D Theses (Open)

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