Photoreactive composite coating with composition dependent wetting properties

L. Mérai, Deák, D. Sebők, E. Csapó, T. S. Kolumbán, B. Hopp, I. Dékány, L. Janovák

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Photoreactive composite thin layers with tunable wetting properties from superhydrophilic to superhydrophobic nature were prepared. To achieve extreme wetting properties, the adequate surface roughness is a crucial factor, which was achieved by the incorporation of plasmonic Ag-TiO2 particles, as polymer filler, into the smooth polymer film with adjusted hydrophilicity. The initial copolymer films were synthesized from hydrophilic 2-hydroxyethyl-acrylate (HEA) and hydrophobic perfluorodecyl-acrylate (PFDAc) monomers. In the case of hydrophobic PFDAc, the photocatalyst-roughened thin films displayed superhydrophobic behavior (γs tot ~ 2.3±1.7 mJ/m2, Θ > 150°), while the roughened hydrophilic pHEA layers possessed superhydrophilicity (γs tot ~ 72.1±0.2 mJ/m2, Θ ~ 0°). The photoactivity of the composites was presented both in solid/ gas (S/G) and solid/ liquid (S/L) interfaces. According to the light-emitting diode (LED) light photodegradation tests on ethanol (EtOH) as volatile organic compound (VOC) model-molecules at the S/L interface, the superhydrophobic hybrid layer was photooxidized 88.3% of the initial EtOH (0.36 mM). At S/L interface the photocatalytic efficiency was depended on the polarity of the model pollutant molecules: the photooxidation of hydrophobic SUDAN IV (c0 = 0.25 mg/mL) dye reached 80%, while in the case of the hydrophilic Methylene Blue dye (c0 = 0.002 mg/mL) it was only 17.3% after 90 min blue LED light (λ = 405 nm) illumination.

Original languageEnglish
Pages (from-to)1061-1071
Number of pages11
JournalExpress Polymer Letters
Volume12
Issue number12
DOIs
Publication statusPublished - Dec 2018

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Keywords

  • Adjustable wetting
  • Coatings
  • Nanomaterials
  • Polymer composites
  • Surface roughness

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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