Study On Microfluidic Asymmetric Structure Actuation Method And Performance

Microfluidic asymmetric structure drive is designed to make microfluidic move in a given direction,which has a wide range of applications in the fields of biochemistry,agent transfer,energy collection and material transport.However,most of the existing drive structures are faced with such problems as complex preparation process,high preparation cost and limited application scenarios.Through experiments and theoretical analysis,the cone-shaped asymmetric drive structure is optimized for normal temperature and high temperature conditions.Based on the optimization of the structure,the driving performance of the microfluidic asymmetric structure was studied and its application was explored.The main research contents and results of this paper are as follows:(1)Normal temperature microfluidic drive with tapered asymmetric structure.Based on the relevant principles,the force of the microtubules with tapered asymmetric cavities on the fluid inside the microtubules was analyzed,and the surface of the cavity was treated with extreme wettability to increase the driving force of the microtubules.Based on the experimental results,the relevant parameters of the cone tube were optimized to further enhance its driving effect.The direction of microfluidic driving in the cone tube and the microfluidic velocity distribution in the process of driving were also studied.Based on the optimized parameters,a long-distance fast drive device,an anti-gravity drive device and a complex directional drive device assembled on demand were developed under normal temperature conditions.(2)High-temperature microfluidic step driven by asymmetric structure.The mechanism that the substrate with the step asymmetry structure can exert a force on the droplet at high temperature was analyzed,and the structural parameters were optimized by evaluating the driving speed,driving stability and droplet loss of the step asymmetry structure under different design parameters.Based on the optimized structure,Leiden Frost vehicle,microfluidic circular high-speed drive,microfluidic anti-gravity drive and other application devices were explored,and the feasibility of the device was verified through experiments.(3)High temperature microfluidic annular asymmetric rotating drive.By designing an annular asymmetric drive structure,the droplet can spin at high speed on the superheated surface while driving the thin plate to spin.Based on the analysis of the factors affecting the rotation,the drive structure and the light plate were optimized based on the experimental results.In addition,in order to enhance the application value of droplet rotation drive,the rotation effect under the condition of large droplet was explored.In combination with the above research content,a uniform step asymmetry structure is arranged in the circumference of the driving structure,which further increases the droplet rotation performance and improves the droplet directional rotation stability.Leiden Frost power generation device was built by using the optimized structure,and the feasibility of the device was proved by testing the induced voltage.