Polyacrylonitrile microscaffolds assembled from mesh structures of aligned electrospun nanofibers as high-efficiency particulate air filters

Tzu Hao Kao, Shuenn Kung Su, Ching Iuan Su, Ai Wei Lee, Jem Kun Chen

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Electrospun polyacrylonitrile (PAN) fibers of very small diameters have potential for integration into filters capable of increasing the particle filtration efficiency. To fulfill the requirements for high-efficiency particulate air (HEPA) filters with a reasonable pressure drop, we generated aligned electrospun PAN fibers through pre-alignment at various rotation rates and subsequent solvent vapor annealing (SVA) under a loading. We evaluated the properties of microscaffold filters assembled from aligned electrospun PAN fibers in the form of linear, square, and triangular multiple meshes. The microscaffolds featuring multiple square meshes exhibited dramatically increased filtration efficiency without a significant pressure drop. A nine-layer cross-ply structure provided a filtration efficiency of 99.98% for 0.25-μm particles at a face velocity of 10 cm s−1; its filtration quality factor was the highest among all of the tested microscaffolds. Thus, HEPA filters featuring a low packing density can be achieved using PAN fibers.

Original languageEnglish
Pages (from-to)615-625
Number of pages11
JournalAerosol Science and Technology
Volume50
Issue number6
DOIs
Publication statusPublished - Jun 2 2016

ASJC Scopus subject areas

  • Materials Science(all)
  • Environmental Chemistry
  • Pollution

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