Research on reducing evaporation of micro flow device
In the process of measurements of micro liquid flow, the evaporation of liquids will bring extra measurement uncertainty. Covering a film on the surface of liquid can effectively reduce the evaporation of liquid. Through the experimental analysis on the influence of different surface density and time of three different kinds of thin-film liquids like paraffin oil, silicone oil, olive oil on the water evaporation, a conclusion was made that when the surface density reached 0.1 g/cm2, the inhibitory effect of the film was basically unchanged, the inhibition effect of silicone oil was the best and it became basically stable and reaches 97% after it was placed for 1h, while paraffin oil had the worst inhibition effect and the inhibition rate did not change with time basically. Results show that the organic solvent with two molecular groups has good spreading property and it is suitable as the solvent for film spreading. According to the structure of double cup weighing system, the inner and outer cup oil film mass calculation and experimental results under different flow points are given. When the flow is 10-200 μL/min, the uncertainty brought by evaporation can be deceased to below 0.04%. When the micro flow is 1-5 μL/min, the uncertainty can reach below 0.39%.
NETL
NSTL
万方数据
维普
