Plastic based Microfluidic Chip for Optical Diffusion Sensor using Laser-induced dielectrophoresis

The diffusion coefficient is important thermophysical property because of its relationship with the size, structure changes of solute molecules. Although there are many sensing method of diffusion coefficient, low-cost and... [ view full abstract ]

The diffusion coefficient is important thermophysical property because of its relationship with the size, structure changes of solute molecules. Although there are many sensing method of diffusion coefficient, low-cost and disposable microchip for use in POCT has not been accomplished. In this study, we designed a novel microfluidic chip for the diffusion sensing device using plastic material that has great advantage in these requirement. In the experiment, manipulation of the particles by laser-induced dielectrophoresis using sputtered photoconductive layer has been succeeded. Moreover, diffusion coefficient of the polystyrene beads was measured and the validity of the diffusion sensing chip was confirmed.