Characteristics of an organic-inorganic hybrid filter consisting of LaMn0.5Fe0.5O3 nanofibers dispersed in PAN
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Organic-inorganic hybrid nanofiber filters having the LaMnO3 and LaMn0.5Fe0.5O3 dispersed in polyacrylonitrile (PAN) weresuccessfully synthesized by two-step electrospinning. In the first step, the LaMnO3 and LaMn0.5Fe0.5O3 nanofibers weresynthesized by vertical-type electrospinning and heat treatment in air at 600 °C. The LaMnO3 and LaMn0.5Fe0.5O3 nanofibershave a single-phase orthorhombic crystal structure without forming secondary phases and impurities. TEM images revealedthat the nanofibers were composed of nanoparticles with a diameter of about 15 nm in pure LaMnO3 and 18 nm inLaMn0.5Fe0.5O3 nanofibers. As a results of XPS analysis, LaMn0.5Fe0.5O3 nanofibers showed more oxygen defect than LaMnO3nanofibers. In the second step, the LaMnO3 and LaMn0.5Fe0.5O3 nanofibers were homogeneously pulverized and mixed witha PAN solution to produce a filter using drum-type electrospinning. Filter performance was evaluated by the filter qualityfactor (QF) obtained by measuring the filtration efficiency and pressure drop of the filter. Compared to the reference (H11nonwoven fabric), the QF increase rates of PAN, PAN/LaMnO3, and PAN/LaMn0.5Fe0.5O3 nanofiber filters were 4.1%, 12.4%,and 24.9%, respectively.
Abstract
Organic-inorganic hybrid nanofiber filters having the LaMnO3 and LaMn0.5Fe0.5O3 dispersed in polyacrylonitrile (PAN) weresuccessfully synthesized by two-step electrospinning. In the first step, the LaMnO3 and LaMn0.5Fe0.5O3 nanofibers weresynthesized by vertical-type electrospinning and heat treatment in air at 600 °C. The LaMnO3 and LaMn0.5Fe0.5O3 nanofibershave a single-phase orthorhombic crystal structure without forming secondary phases and impurities. TEM images revealedthat the nanofibers were composed of nanoparticles with a diameter of about 15 nm in pure LaMnO3 and 18 nm inLaMn0.5Fe0.5O3 nanofibers. As a results of XPS analysis, LaMn0.5Fe0.5O3 nanofibers showed more oxygen defect than LaMnO3nanofibers. In the second step, the LaMnO3 and LaMn0.5Fe0.5O3 nanofibers were homogeneously pulverized and mixed witha PAN solution to produce a filter using drum-type electrospinning. Filter performance was evaluated by the filter qualityfactor (QF) obtained by measuring the filtration efficiency and pressure drop of the filter. Compared to the reference (H11nonwoven fabric), the QF increase rates of PAN, PAN/LaMnO3, and PAN/LaMn0.5Fe0.5O3 nanofiber filters were 4.1%, 12.4%,and 24.9%, respectively.
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