Tunable fabrication of three-dimensional polyamide-66 nano-fiber/nets for high efficiency fine particulate filtration

A novel airborne particulate filtration medium, consisting of a two-tier composite structure, i.e., a nano-fiber/net (NFN) top layer and a conventional nonwoven microfibrous support, was demonstrated for highly efficient and low pressure drop filtration for the first time. The polyamide-66 (PA-66) NFN structured top layer, which is composed of traditional electrospun nanofibers and two-dimensional (2D) spider-web-like nano-nets, was electro-spinning/netting (ESN) deposited on the nonwoven polypropylene (PP) scaffold for constructing this new concept of filter. The morphology of NFN architecture, including fiber diameter, coverage rate, pore-width and layer-by-layer packing structure of the nano-nets, can be finely controlled by regulating the solution properties and several ESN process parameters. Taking advantage of several fascinating features such as extremely small diameter, high porosity, controllable coverage rate, nano-nets bring to the NFN/nonwoven composite filtration medium several excellent filtration features such as high filtration efficiency (up to 99.9%), low pressure drop, facile filters cleaning, and more lightweight.

[1]  Chengjun Zhou,et al.  Electrospun polyethylene oxide/cellulose nanocrystal composite nanofibrous mats with homogeneous and heterogeneous microstructures. , 2011, Biomacromolecules.

[2]  K. Braeckmans,et al.  Stimuli-responsive electrospun fibers and their applications. , 2011, Chemical Society reviews.

[3]  D. Dockery,et al.  Increased Particulate Air Pollution and the Triggering of Myocardial Infarction , 2001, Circulation.

[4]  Bin Ding,et al.  Electro-netting: fabrication of two-dimensional nano-nets for highly sensitive trimethylamine sensing. , 2011, Nanoscale.

[5]  G. Oberdörster,et al.  Nanotoxicology: An Emerging Discipline Evolving from Studies of Ultrafine Particles , 2005, Environmental health perspectives.

[6]  Benjamin Chu,et al.  Functional nanofibers for environmental applications , 2008 .

[7]  Bin Ding,et al.  Fabrication of biomimetic superhydrophobic surfaces inspired by lotus leaf and silver ragwort leaf. , 2011, Nanoscale.

[8]  Bin Ding,et al.  Electrospun nanomaterials for ultrasensitive sensors , 2010, Materials Today.

[9]  Bin Ding,et al.  Controllable fabrication of soap-bubble-like structured polyacrylic acid nano-nets via electro-netting. , 2011, Nanoscale.

[10]  Bin Ding,et al.  Formation of novel 2D polymer nanowebs via electrospinning , 2006 .

[11]  Christopher J. Hogan,et al.  Nanoparticle filtration by electrospun polymer fibers , 2007 .

[12]  Manit Nithitanakul,et al.  Ultrafine Electrospun Polyamide‐6 Fibers: Effect of Solution Conditions on Morphology and Average Fiber Diameter , 2004 .

[13]  Bin Ding,et al.  A highly sensitive humidity sensor based on a nanofibrous membrane coated quartz crystal microbalance , 2010, Nanotechnology.

[14]  Bin Ding,et al.  Highly sensitive humidity sensors based on electro-spinning/netting a polyamide 6 nano-fiber/net modified by polyethyleneimine , 2011 .

[15]  Seeram Ramakrishna,et al.  Fabrication of nanofibers with antimicrobial functionality used as filters: protection against bacterial contaminants , 2007, Biotechnology and bioengineering.

[16]  Wallace Woon-Fong Leung,et al.  Filtration of nano-aerosol using nanofiber filter under low Peclet number and transitional flow regime , 2011 .

[17]  J. Deitzel,et al.  The effect of processing variables on the morphology of electrospun nanofibers and textiles , 2001 .

[18]  Hyung-Sub Kang,et al.  Preparation of polyamide-6/chitosan composite nanofibers by a single solvent system via electrospinning for biomedical applications. , 2011, Colloids and surfaces. B, Biointerfaces.

[19]  B. Hsiao,et al.  Ultra-fine cellulose nanofibers: new nano-scale materials for water purification , 2011 .

[20]  Donald Rivin,et al.  Transport properties of porous membranes based on electrospun nanofibers , 2001 .

[21]  Kwangsok Kim,et al.  High flux ultrafiltration membranes based on electrospun nanofibrous PAN scaffolds and chitosan coating , 2006 .

[22]  M. El-Newehy,et al.  Lecithin blended polyamide-6 high aspect ratio nanofiber scaffolds via electrospinning for human osteoblast cell culture , 2011 .

[23]  Bin Ding,et al.  One-step electro-spinning/netting technique for controllably preparing polyurethane nano-fiber/net. , 2011, Macromolecular rapid communications.

[24]  D. Fang,et al.  High-flux Thin-film Nanofibrous Composite Ultrafiltration Membranes Containing Cellulose Barrier Layer , 2010 .

[25]  Bin Ding,et al.  Polyamide 6 composite nano-fiber/net functionalized by polyethyleneimine on quartz crystal microbalance for highly sensitive formaldehyde sensors , 2011 .

[26]  Morinobu Endo,et al.  Self‐Sustained Thin Webs Consisting of Porous Carbon Nanofibers for Supercapacitors via the Electrospinning of Polyacrylonitrile Solutions Containing Zinc Chloride , 2007 .

[27]  Seeram Ramakrishna,et al.  Electrospun nanofibrous polysulfone membranes as pre-filters: Particulate removal , 2007 .

[28]  Gang Sun,et al.  Obituary notices of fellows deceased , 1852 .

[29]  D. Aussawasathien,et al.  Separation of micron to sub-micron particles from water: Electrospun nylon-6 nanofibrous membranes as pre-filters , 2008 .

[30]  Andreas Greiner,et al.  Electrospinning: a fascinating method for the preparation of ultrathin fibers. , 2007, Angewandte Chemie.

[31]  K. Lam,et al.  A novel size-tunable nanocarrier system for targeted anticancer drug delivery. , 2010, Journal of controlled release : official journal of the Controlled Release Society.

[32]  L. Servant,et al.  Spectroscopic characterization of metal chloride/polyamide complexes , 1995 .

[33]  Kwangsok Kim,et al.  Structure and process relationship of electrospun bioabsorbable nanofiber membranes , 2002 .

[34]  V. Jacobs,et al.  Performance evaluation of electrospun nanofibrous membrane , 2010 .

[35]  Bin Ding,et al.  Large-scale fabrication of two-dimensional spider-web-like gelatin nano-nets via electro-netting. , 2011, Colloids and surfaces. B, Biointerfaces.

[36]  Huaqiang Cao,et al.  ZnO@graphene composite with enhanced performance for the removal of dye from water , 2011 .

[37]  Andreas Greiner,et al.  Nanostructured Fibers via Electrospinning , 2001 .

[38]  Y. Hsieh,et al.  Nanofibrous membranes from aqueous electrospinning of carboxymethyl chitosan , 2008, Nanotechnology.

[39]  B. Ding,et al.  Fabrication of a super-hydrophobic nanofibrous zinc oxide film surface by electrospinning , 2008 .

[40]  Jan Gustavsson,et al.  Why we need effective air filtration , 2002 .

[41]  Seeram Ramakrishna,et al.  Electrospun nanofibrous filtration membrane , 2006 .

[42]  Bin Ding,et al.  Label-free ultrasensitive colorimetric detection of copper(II) ions utilizing polyaniline/polyamide-6 nano-fiber/net sensor strips , 2011 .

[43]  B. Hsiao,et al.  Thin-film nanofibrous composite membranes containing cellulose or chitin barrier layers fabricated by ionic liquids , 2011 .

[44]  Jan Gustavsson.  Software programme that calculates the life cycle cost of air filters , 2002 .

[45]  P. Lipowicz,et al.  High Efficiency Fine Particulate Filtration Using Carbon Nanotube Coatings , 2004 .

[46]  Karen De Clerck,et al.  The effect of temperature and humidity on electrospinning , 2009, Journal of Materials Science.

[47]  A. Harlin,et al.  Electrospinning of polyacrylonitrile (PAN) solution: Effect of conductive additive and filler on the process , 2009 .

[48]  Yuliang Zhao,et al.  Cytotoxicity of carbon nanomaterials: single-wall nanotube, multi-wall nanotube, and fullerene. , 2005, Environmental science & technology.

[49]  B. Ding,et al.  Engineering biomimetic superhydrophobic surfaces of electrospun nanomaterials , 2011 .

[50]  A. Varesano,et al.  Electrospun Porous Mats for High Efficiency Filtration , 2007 .

[51]  M. Kotaki,et al.  A review on polymer nanofibers by electrospinning and their applications in nanocomposites , 2003 .