Abstract
We designed a filter media which could collect of submicron size particles by applying electrostatic charge. To meet our proposed design, three different types of nano-scaled materials such as nonconductor ($SiO_2$), conductor ($Al_{2}O_{3}$), ferroelectric material ($BaTiO_3$) were incorporated into the melt-blown nonwovens made of micro fiber. Polypropylene melt-blown nonwovens, basis weights of $15\;g/m^2$ and $20\;g/m^2$, were prepared. The nano particles were diffused in the ethanol and then the electro sprayed on the nonwoven fabrics to be uniformly dispersed. The specimens containing nano particles were conditioned for three hours in the vacuum drying oven. To meet our purpose, the specimens were corona charged to develop the static electricity. The charging density and filtration efficiency of the filter media were investigated with various experimental conditions: such as types of additives and their concentrations. It was shown that the charging density and filtration efficiency were increased with increasing the basis weight of the samples. The filter media incorporated with ferroelectric particles showed the most desirable results compared with the other two additives.
