J. Mater. Sci. Technol. ›› 2020, Vol. 41: 159-167.DOI: 10.1016/j.jmst.2019.04.046
• Research Article • Previous Articles Next Articles
Emese Lantosa, László Méraia, Ágota Deáka, Juan Gómez-Pérezb, Dániel Sebőka, Imre Dékánya, Zoltán Kónyab, László Janováka*()
Received:
2019-02-06
Revised:
2019-03-23
Accepted:
2019-04-15
Published:
2020-03-15
Online:
2020-04-10
Contact:
Janovák László
Emese Lantos, László Mérai, Ágota Deák, Juan Gómez-Pérez, Dániel Sebők, Imre Dékány, Zoltán Kónya, László Janovák. Preparation of sulfur hydrophobized plasmonic photocatalyst towards durable superhydrophobic coating material[J]. J. Mater. Sci. Technol., 2020, 41: 159-167.
Fig. 1. TEM-micrographs of precipitated sulfur nanoparticles and wetting of spray-coated S-nanoparticle layers with deionized water as a test liquid (a), aqueous dispersion of prepared sulfur nanoparticles upon precipitation and 24 h later (b), size-distribution of precipitated sulfur nanoparticles (c).
Fig. 2. Measured streaming potential values of the 0.01% Ag-TiO2 photocatalyst suspension during the addition of the 0.09% suspension of the sulfur nanoparticles at a pH of 5.00 (a) and the recorded Raman spectra of Ag-TiO2 photocatalyst, sulfur nanoparticles, and Ag-TiO2/S composite sample with superhydrophobic wetting properties (b).
Fig. 5. Apparent static water contact angles on Ag-TiO2/S composite surfaces as a function of S-content. The photograph illustrates the water-repellent behaviour of 90 wt% S-containing composite powder film with water drop coloured with methylene blue dye.
Fig. 6. Evolution of advancing and receding contact angles on spray-coated 90 wt% sulfur-hydrophobized photoreactive Ag-TiO2 layers, as well as the determined total apparent surface free energy (γstot) values before and after 180 min blue LED light illumination (λ = 405 nm).
Fig. 8. UV-VIS diffuse-reflectance spectra and photographs of Ag-TiO2, S nanoparticles and Ag-TiO2/S composites with the corresponding S-content (given in wt%).
Fig. 9. Characterization of EtOH decomposition (c0 = 0.36 mM) on pure Ag-TiO2 and sulphur layers, and on Ag-TiO2/S composite film (90 wt% S) under LED light illumination (λ = 405 nm) as the function of illumination time. The composite layer was also measured under dark condition for reference (a). EtOH concentration change on Ag-TiO2/S film after 0, 24, 48, 72, 96 and 168 h continuous LED light irradiation (b).
Fig. 10. Effect of long-term UV-A (blue LED) irradiation on the wetting properties of the organic polymer-based and inorganic sulfur-containing superhydrophobic composite coatings.
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