Enhanced Aerosol Particle Filtration Efficiency of Nonwoven Porous Cellulose Triacetate Nanofiber Mats
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Aerosol particle ﬁltration in most penetrating particle size (MPPS) region is of great challenge for conventional nonwoven ﬁlter mats. The present work, therefore, redesigns conventional ﬁlter mats by introducing porous structure. A combination of thermally induced phase separation and breath ﬁgure mechanism was employed to synthesize porous cellulose triacetate ﬁbers, in conjunction with the volatile solvent methylene chloride. The ambient humidity, the concentration of the polyvinylpyrrolidone (PVP) secondary polymer, and the ethanol cosolvent were all adjusted to modify the Taylor cone formation, jet stability,and ﬁber porosity. After ﬁber formation, the PVP was removed to obtain a superhydrophobic material. To distinguish the eﬀect of pores, the performance of porous and nonporous nanoﬁbers having similar sizes was conducted. Tests were performed using various dust particle sizes, and the results show that the collection eﬃciency of the porous ﬁbers, resulting from particle diﬀusion, inertial impaction, and interception, was improved. Interestingly, the eﬃciency of the porous ﬁbers in the MPPS region was exceptionally enhanced (up to 95%), demonstrating that the presence of dynamic pores greatly contributes to particle capture.
This research was supported by JSPS KAKENHI Grant-in-Aid numbers 26709061 and 16K13642 and by the Center for Functional Nano Oxides at Hiroshima University.
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American Chemical Society
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Graduate School of Engineering