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This paper describes the development of a micro screw pump which can be installed anywhere where pumping is needed in a μ-TAS. We made this micro screw pump to let fluid flow at an extremely low flow rate with high response, and we also created a new method for on-site flow sensing by monitoring the position of the micro screw. The screw we use is made by microstereolithography with magnetically modified...
A particle manipulating micromixer was developed successfully in this study. The present device was fabricated by simply MEMS process. Only two photomasks, one for electrode array chip and another for micro-channel, were needed to manufacture the micromixer. Dielectrophoresis (DEP) force was used to manipulate the particles in the micro-channel. In this experience, polymer particles with diameter...
This essay discusses in detail the instance of micro-PVC exposed in gravitational field-flow fractionation. Based on this situation, the changing regulation of balance velocity and retention ratio with velocity of the fluid has simulated. Micro-PVC has been separated by gravitational field-flow fractionation. By comparing the result of experimentation to that of simulation, deficiencies on the theory...
The key issues related to biosensor technology include selectivity, sensitivity, response and recovery times, and detection limit; most of these limitations stem from biofouling resulting from the binding of undesirable moieties such as non-specific proteins to the sensor surface. Thus, removal of non-specifically bound (NSB) proteins remains a significant challenge in biosensing applications. Operation...
A device sensing the change in capacitance as single cells flow through a microfluidic channel past interdigitated electrodes is described. A 0.45 aF resolution within a 3 ms time constant has been achieved. A cellpsilas electrical properties can vary greatly due to ionic currents, double layer effects, and membrane potential gradients (particularly when operating below 200 MHz). Sensing at microwave...
Particles in fluid suffer the acoustic radiation force from the different physical characteristic between suspended particle and host liquid, so particles would move to predetermined positions in certain sound field. The separation technique utilizing acoustic radiation force is a promising alternative method to conventional technologies, especially in Micro Electro Mechanical Systems (MEMS). This...
The paper deals with optoelectrostatic pumping of conductive liquids in microchannels. In this technique the fluid is heated by the laser irradiation and exposed to an external AC electric field. If the fluid permittivity and conductivity vary with temperature the electric volume force is generated and pumping effect can be achieved. A numerical model of this phenomenon is presented and it is based...
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