The Analysis and Application of Micro-solenoid Valve
Date Issued
2010
Date
2010
Author(s)
Chen, Cheng-Fu
Abstract
In recent years, the valves are essential component in microfluidic devices and micro-total-analysis-system. In general, the micro-solenoid valve was made of magnetic materials and the external magnets was applied to attract or repel squeeze the membrane. Based on the squeeze through the chamber, the thickness of membrane is the key factor about the moving behavior of the micro-solenoid valve. However, in the microchannel with high aspect ratio, the deformation of membrane can not be used to achieve the valve moving. The planar valve and enameled wire used to build the microfluidic devices were presented in this study. The magnetic field to drive the present planar micro-solenoid valve was generated by enameled wires. The polarity of iron microvalve can be attracted or repelled by magnetic. The currents were applied to control the opening and closing of the micro-solenoid valve. In addition, the measurements of the net force and hysteresis curves from valve motion. According to the experimental results, the magnetic induction will produce 14.7 Gauss to drive the valve with the load current of the coil is 0.4A. From the analysis results of the hysteresis curve, the magnetic induction by valve is 7.0 Gauss when the loading current is 0.9A. The residual magnetism and coercive force are 0.4 Gauss and 0.005 A/m, respectively. The moving behaviors of the microvalve were measured by the high-speed CCD. The period of opened and closed is 0.005 second when two coils are loading in different phase of 0.9A square wave. Furthermore, the present valve can obstruct most of fluid and change fluidic direction slightly with the background flow is 15μL/hr.
Subjects
micro-solenoid valve
active valve
hysteresis
Type
thesis
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