A Surface Acoustic Wave Technology For Driving Microfluidics Pesticide Residues

Microfluidic systems,also known as "chip labs",have the advantages of low sample consumption,short reaction times,tight handling and portability.The detection of pesticide residues is an important task related to people's life safety and social stability,and also belongs to the practical scope of safety engineering professional research.The microfluidic chip integrates multiple functions such as sample pretreatment,target sorting and detection onto a single chip,shortening the analysis time in the form of fluid and array multi-channel,providing an efficient technical platform for pesticide residue detection.Conventional fluid drive methods generally include electromagnetic drive,piezoelectric drive,and pneumatic drive.Electromagnetic and piezoelectric drives often require a combination of valves and pumps to induce fluid flow in one direction,using periodic vibrations of rectangular or circular diaphragms to deliver liquid.This method is disadvantageous in terms of sealing and space utilization,and the internal flow area in the flow passage is small,the structure of the valve pump structure is increased,and the processing cost is high;the pneumatic driving method requires installation of an external device that changes the hydraulic pressure in the flow passage.It is not conducive to the miniaturization and integration of microfluidic chips.Based on the existing microchannel materials,according to the corrosion resistance and good lubricity of Teflon materials,a new method of X-ray processing of Teflon microchannels with local heating function was proposed,and the side and bottom surfaces were prepared.A smoother Teflon microchannel.In order to generate the left and right asymmetrical surface acoustic wave driving force,the unidirectional driving of the surface acoustic wave is realized.Based on the micromachining technology,the floating gate type unidirectional surface acoustic wave driver is designed and tested,and the surface acoustic wave driver and the special surface acoustic wave driver are Fluorine micro-channel integration,with Teflon micro-channel as the base,the surface acoustic wave driver is attached to the surface of the micro-channel,using the interdigital transducer to generate the surface acoustic wave to directly drive the liquid,so that the liquid can move in a single direction.