Generation Of P(VDF-TrFE)Function Particles Based On Microfluidic Technology

Microfluidics is a micro-nano processing technology that produced with the development of era.Microreactor,micromixer and droplet microfluidic paly different roles in each subject areas for different application.Microfluidics has grasped much attention recently in biological analysis,chemical synthesis,drug delivery,thermal sensor,and hydrodynamic mechanisms due to its advantages of low fabrication cost,minimal materials'consumption,and fast continuous processing.Among various microfluidic technology that have been developed,microreactor systems are becoming increasing popular for fabricating materials.Compared to conventional batch reactions,the microreactor shows unique advantages such as continuous processing and highly controlled reaction conditions.As a crucial component in a microreactor device,micromixers play a crucial role in fully mixing of different reagents.The chaotic advection generated in the twisted structure of micromixer guarantees the two dispersed phases fully mixed,so the reaction efficiency are improved accordingly.The final droplet generation technology form the dispersion to different morphology structures such as spheres,disks and rods.In our thesis,we report on the feasible fabrication of microfluidic devices for ferroelectric polymers' synthesis in a rapid and stable fashion.Utilizing micro-mixing and flow-focusing in microchannels,poly(vinylidene fluoride-trifluoroethylene)and copper phthalocyanine are uniformly dispersed in one hydrogel particle,which are then demonstrated to immediate and complete on-chip steady polymerization by moderate ultraviolet treatment.The advantage of our droplet-based microfluidic devices is generating versatile particles from simple spheres to disks or rods,and the lengths of particles can be precisely tuned from 30 to 400?m through adjusting the flow rates of both disperse and oil phases.In addition,this mixed technique allows for the continuous production of dielectric microparticles with controlled dielectric properties between 10 and 160.Such a microfluidic device offers a flexible platform for multiferroic applications,the generated microparticles with high dielectric properties have potential to apply in micro resistor and micro capacitors.Finally,we explore to prepare piezoelectric micro device.We implant silver paste into the microchip as polarization electrodes to polarity the generated microparticles.The polarization particles have piezoelectric property and have the potential for piezoelectric sensor.