title: Asymmetric free-standing film with multifunctional anti-bacterial and self-cleaning properties.
abstract: A superhydrophobic/hydrophilic asymmetric free-standing film has been created using layer-by-layer assembly technique. Poly(ethylene-imine)-Ag(+) complex (PEI-Ag(+)) at pH 9.0 was assembled with poly(acrylic acid) (PAA) at pH 3.2 on a Teflon substrate to yield a micronanostructured surface that can be turned to be superhydrophobic after being coated with a low surface energy compound. Silver nanoparticle loaded free-standing film with one surface being superhydrophobic while the other surface is hydrophilic was then obtained after detachment from the substrate. The superhydrophobicity enabled the upper surface with anti-adhesion and self-cleaning properties and the hydrophilic bottom surface can release silver ions as antibiotic agent. The broad-spectrum antimicrobial capability of silver ions released from the bottom surface coupled with superhydrophobic barrier protection of the upper surface may make the free-standing film a new therapy for open wound.
authors.affiliation: MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Liyan
authors.initials: L
authors.lastname: Shen
authors.forename: Bailiang
authors.initials: B
authors.lastname: Wang
authors.forename: Jinlei
authors.initials: J
authors.lastname: Wang
authors.forename: Jinhong
authors.initials: J
authors.lastname: Fu
authors.forename: Catherine
authors.initials: C
authors.lastname: Picart
authors.forename: Jian
authors.initials: J
authors.lastname: Ji
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D007097:Imines / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry; D011095:Polyethylenes / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000900:Anti-Bacterial Agents; D007097:Imines; D011095:Polyethylenes; C505405:poly(ethylene imine); D012834:Silver