title: Superamphiphilic Janus fabric.
abstract: Janus fabrics with superamphiphilicity were fabricated via electrospinning of polyacrylonitrile (PAN). PAN nanofibrous mats were formed on an aluminum foil substrate and then thermally treated to cause hydrolysis. An identical PAN solution was subsequently electrospun onto the hydrolyzed PAN layer, followed by peeling off of the bicomposite film from the collector substrate to produce a free-standing Janus fabric. On one side, the electrospun PAN mat exhibited superhydrophobic properties, with a water contact angle of 151.2°, whereas the initially superhydrophobic PAN sheet on the opposite side of the fabric was converted to a superhydrophilic surface (water contact angle of 0°) through hydrolysis of the surface functional groups induced by the thermal treatment. The resulting Janus fabrics exhibited both superhydrophobicity, repelling water on the one side, and superhydrophilicity, absorbing water on the other side. The organic solvent resistance of the PAN nanofibrous sheets was remarkably improved by incorporation of a tetraethyl orthosilicate. This facile and simple technique introduces a new route for the design and development of functional smart, robust fabrics from an inexpensive, commercially available polymer.
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
authors.forename: Ho Sun
authors.initials: HS
authors.lastname: Lim
authors.forename: Song Hee
authors.initials: SH
authors.lastname: Park
authors.forename: Song Hee
authors.initials: SH
authors.lastname: Koo
authors.forename: Young-Je
authors.initials: YJ
authors.lastname: Kwark
authors.forename: Edwin L
authors.initials: EL
authors.lastname: Thomas
authors.forename: Youngjin
authors.initials: Y
authors.lastname: Jeong
authors.forename: Jeong Ho
authors.initials: JH
authors.lastname: Cho
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000379:methods*; D016062:Porosity
chemical_list: D000180:Acrylic Resins; C010504:polyacrylonitrile