title: Efficient and reusable polyamide-56 nanofiber/nets membrane with bimodal structures for air filtration.
abstract: Nanofibrous media that both possess high airborne particle interception efficiency and robust air permeability would have broad technological implications for areas ranging from individual protection and industrial security to environmental governance; however, creating such filtration media has proved extremely challenging. Here we report a strategy to construct the bio-based polyamide-56 nanofiber/nets (PA-56 NFN) membranes with bimodal structures for effective air filtration via one-step electrospinning/netting. The PA-56 membranes are composed of completely covered two-dimensional (2D) ultrathin (∼20 nm) nanonets which are optimized by facilely regulating the solution concentration, and the bonded scaffold fibers constructed cavity structures which are synchronously created by using the CH3COOH inspiration. With integrated properties of small aperture, high porosity, and bonded scaffold, the resulting PA-56 NFN membranes exhibit high filtration efficiency of 99.995%, low pressure drop of 111 Pa, combined with large dust holding capacity of 49 g/m(2) and dust-cleaning regeneration ability, for filtrating ultrafine airborne particles in the most safe manner involving sieving principle and surface filtration. The successful synthesis of PA-56 NFN medium would not only make it a promising candidate for air filtration, but also provide new insights into the design and development of nanonet-based bimodal structures for various applications.
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Bowen
authors.initials: B
authors.lastname: Liu
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Shichao
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China.
authors.forename: Xueli
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China; Nanomaterials Research Center, Modern Textile Institute, Donghua University, Shanghai 200051, China.
authors.forename: Jianyong
authors.initials: J
authors.lastname: Yu
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China; Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China. Electronic address: binding@dhu.edu.cn.
authors.forename: Bin
authors.initials: B
authors.lastname: Ding
mesh_terms: D000388:Air; D005374:Filtration / Q000295:instrumentation* / Q000379:methods*; D015394:Molecular Structure; D057139:Nanofibers / Q000737:chemistry*; D009757:Nylons / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties
chemical_list: D009757:Nylons
keywords: Air filtration; Cavity structure; High efficiency; Long service life; Nanofiber/nets