Study On Flexible And Superhydrophobic Pressure Sensor And Its Application In Flow Monitoring

By constructing a secondary micro-nano structure with low surface energy on the pore structure of the sponge,the sponge with super-hydrophobic properties is widely used in the fields of oil-water separation and anti-fouling materials.The super-hydrophobic piezoresistive sensor with super-hydrophobic surface with surface micro-nano structure and sensor is also widely used,but most of the existing preparation processes exist that the micro-nano structure is destroyed under the action of external stress,the ordinary sponge has poor recovery,does not Corrosion resistance and other issues.In this paper,the traditional piezoresistive sensor has poor stretchability,low sensitivity,high working environment requirements and other issues,and prepared a flexible micro-nano composite structure MXene sensor.That is,a micro-nano composite structure is constructed by adsorbing a conductive two-dimensional nano-material on a sponge skeleton,and then a low surface modification is performed,and finally a flexible piezoresistive sensor with excellent resistance response and super-hydrophobic performance is formed.The main work is as follows:?1?Preparation of super-hydrophobic Ti₃C₂T_x@RTV@MF sponge.First,Ti₃C₂T_xMXene was synthesized by lithium fluoride/hydrochloric acid method.Ti₃C₂T_xconductive sponge prepared by dip coating method,Ti₃C₂T_x nanosheets are easy to fall off the sponge skeleton during use,resulting in sensor failure.We cured the MXene nanosheets on the sponge skeleton through the vulcanization reaction of vulcanized silicone rubber at room temperature,and finally prepared a stable super-hydrophobic Ti₃C₂T_x MXene@RTV conductive sponge.?2?Study on the hydrophobicity and piezoresistive performance of the Ti₃C₂T_x@RTV@MF sponge piezoresistive sensor.MXene dip coating on the sponge provides a conductive path for the sensor,while the micro-nano structure formed on the sponge surface and room temperature vulcanized silicone rubber form a stable super-hydrophobic structure.In this paper,a series of experimental methods were used to characterize the superhydrophobic performance and piezoelectric performance of the sensor.The results show that the sensor has stable superhydrophobic performance that is resistant to corrosion and deformation and high piezoresistive performance.?3?Application in oil-water separation and flow monitoring.In order to study the wetting behavior of water and oil on melamine sponges,we explored the mechanism of sponge oil-water separation,and finally used this sensor to have super-hydrophobic and super-lipophilic properties,which were used in oil-water separation experiments.According to the resistance change of the liquid flow to the sensor,the sensor can also be used to monitor the flow of organic matter.