A Micromachined Flow-through Cell For Continuous Pico Volume Sampling In An Analytical Flow

摘要

A micromashined flow-through cell for liquid sampling is presented. The flow channel is formed by two 350 pin deep silicon basins facing each other with a 60 pm diameter orifice in the Centre of one of the basins. A piezo-ceramic disc glued to the silicon basin opposite the orifice controls,the drop ejection in a drop-on-demand fashion. The ejected drops have a diameter of 40 prit, i.e. a drop volume of 34 pl. At an ejection frequency of 100 Hz, a sample flow of 0.2 0/min is obtained.