Multilevel‐layer‐structured polyamide 6/poly(trimethylene terephthalate) nanofibrous membranes for low‐pressure air filtration

Abstract

Multilevel-layer-structured polyamide 6 (PA6) and poly(trimethylene terephthalate) (PTT) nanofibrous membranes were fabricated by an electrospinning method. The morphology of the multileveled layers membranes were characterized by scanning electron microscopy. The tensile strength of the PA6-PTT membranes were controlled by the regulation of the layer structure. Additionally, the surface area of the multilevel-layer-structured membranes was also investigated with the nitrogen physisorption isotherms. Furthermore, the multilevel-layered membranes, with a tensile strength of 9.8 MPa and a surface area of 5.1601 m 2 /g on 300-nm dioctylphthalate (DOP) aerosol particles, showed a higher efficiency (95.825%) and a lower pressure drop (55 Pa) than the pure PA6 membranes (with values of 94.634% and 467 Pa, respectively). This suggested a new method for high-efficiency and lowpressure-drop filtration applications. Correlations between the filtration pressure drop and filtration efficiency with the structure of the membranes, particle size, and surface velocity were proposed, and the advantage of the multilevel-layered structure is also discussed.

High Efficiency Poly(acrylonitrile) Electrospun Nanofiber Membranes for Airborne Nanomaterials Filtration

“…[2] The performance of air filtration membranes is also affected by fiber diameter, pore size, and the general structure of morphology. [14,42,43] Fiber diameter can impact the filtration efficiency and therefore selectivity of the materials, while porosity and pore size distribution have a significant effect on pressure drop. [26] Thus, the geometrical, characterization need to be investigated in order to fabricate membranes with high selectivity and relatively low pressure drop.…”

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“…The filter efficiency, pressure drop, and QF are the main factors to evaluate the filter performance . Fiber films with an effective filtration area of 176.7 cm 2 (a diameter of 15 cm) were loaded on a TSI‐automated filter tester for measurement at room temperature.…”

“…The face velocity of the supplied air was 5.5 cm/s, and the number of the DOP particles was analyzed by a condensation particle counter before and after the filters. The quality factor (QF) of the filter, which is often used to evaluate the filtration performance of filters, is defined as follows: QF = −ln(1− E f )/ P d , where E f is the filtration efficiency, and P d is the pressure drop across the fiber filter …”

Hydro‐Assisted Self‐Regenerating BrominatedN‐Alkylated Thiophene Diketopyrrolopyrrole Dye Nanofibers—A Sustainable Synthesis Route for Renewable Air Filter Materials

“…A vast majority of the earlier reports on nanofibrous air filters published in the last 2 years invariably use an energy‐intensive spinning process (electrospinning, blow spinning, etc.). [ 23–41 ] Recently, a few attempts have been made to adopt alternative fabrication routes of relatively low energy consumption. [ 42–44 ] To date, fully solution‐processed nanofibrous filters offer the best sustainable alternative as there is greater room for cost reduction, energy reduction, and material reuse.…”