Photoreactive composite coating with composition dependent wetting properties

eXPRESS Polymer Letters

L. Merai¹ 

关键词: coatings;    nanomaterials;    polymer composites;    surface roughness;    adjustable wetting;   

DOI  :  10.3144/expresspolymlett.2018.93

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

Photoreactive composite thin layers with tunable wetting properties from superhydrophilic to superhydrophobicnature were prepared. To achieve extreme wetting properties, the adequate surface roughness is a crucial factor, which wasachieved by the incorporation of plasmonic Ag-TiO2 particles, as polymer filler, into the smooth polymer film with adjustedhydrophilicity. The initial copolymer films were synthesized from hydrophilic 2-hydroxyethyl-acrylate (HEA) and hydrophobicperfluorodecyl-acrylate (PFDAc) monomers. In the case of hydrophobic PFDAc, the photocatalyst- roughened thin filmsdisplayed superhydrophobic behavior (γstot ~ 2.3±1.7 mJ/m2, Θ > 150°), while the roughened hydrophilic pHEA layers possessedsuperhydrophilicity (γstot ~ 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 onethanol (EtOH) as volatile organic compound (VOC) model- molecules at the S/L interface, the superhydrophobic hybridlayer was photooxidized 88.3% of the initial EtOH (0.36 mM). At S/L interface the photocatalytic efficiency was dependedon the polarity of the model pollutant molecules: the photooxidation of hydrophobic SUDAN IV (c0 = 0.25 mg/mL) dyereached 80%, while in the case of the hydrophilic Methylene Blue dye (c0 = 0.002 mg/mL) it was only 17.3% after 90 minblue LED light (λ = 405 nm) illumination.

【 授权许可】

CC BY