Electrospinning method for fabricating nanofiber air filter with minimized pressure drop

An electrospinning method for fabricating a nanofiber air filter with a minimized pressure drop, comprising following steps:

• S1. dissolving a specified amount of powder polymer material in a solvent, and magnetically stirring a resulting solution;
• adding the solution to a syringe connected with a microneedle by a plastic tube, and pumping the solution by the syringe into an electrospinning machine;
• S2. allowing the electrospinning machine to work under a voltage, such that the solution generates nanofibers;
• the nanofibers are interweaved to fabricate air filters for removing particles in air with a particle removal efficiency η(Vm, tn) and pressure drop ΔP(Vm, tn), Vm is electrospinning voltage and tn is electrospinning time;
• and
• S3. finding optimal electrospinning voltage Vopt and optimal electrospinning time topt, such that an air filter fabricated by Vopt and topt can achieve target particle removal efficiency ηtar and minimized pressure drop ΔPmin;
• the step of S3 comprises the following steps:
• S31, drawing relationship curves between the particle removal efficiency η(Vm, tn) and the pressure drop ΔP(Vm, tn) of the air filter fabricated;
• under the same particle removal efficiency. the relationship curve which achieves the lowest pressure drop is an optimal condition, and corresponding electrospinning voltage Vm is the optimal voltage Vopt;
• S32, selecting values of the η(Vopt, tn) and tn to fit a following polynomial function by mathematical software:
• η=ƒ(t)=1−exp(a·t+b);
• wherein t represents electrospinning time, η represents particle removal efficiency, a and b are constants;
• and
• S33, setting the target particle removal efficiency ηtar, corresponding optimal electrospinning time topt is calculated by the polynomial function η=ƒ(t).