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Radical modification of the wetting behavior of textiles coated with ZnO thin films and nanoparticles when changing the ambient pressure in the pulsed laser deposition process

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: A.C. Popescu, L. Duta, G. Dorcioman, I.N. Mihailescu, G.E. Stan, I. Pasuk, I. Zgura, T. Beica, I. Enculescu, A. Ianculescu, I. Dumitrescu

Editorial: Journal of Applied Physics, 110 (6), p.064321, 2011.

Rezumat:

Cotton/polyester woven fabrics were functionalized with ZnO thin films or nanoparticles by pulsed laser deposition, using a KrF* excimer laser source. Depending on the number of applied laser pulses, well-separated nanoparticles (for 10 pulses) or compact thin films (for 100 pulses) were deposited. The synthesized nanostructures were evaluated morphologically by scanning electron microscopy and atomic force microscopy, physico-chemically by x-ray diffraction and functionally by the contact angle method. By modifying the ambient gas nature and pressure in the deposition chamber, hydrophilic or hydrophobic surfaces were obtained. When using an oxygen flux, both the deposited thin films and nanoparticles were hydrophilic. After deposition in vacuum, the nanoparticles were hydrophobic, but the thin films were super-hydrophobic. This radical modification of wetting behavior was assigned to the differences in microstructure features and surface electrical charging in the two cases.

Cuvinte cheie: woven fabrics, ZnO thin films and nanoparticles, PLD, hydrophobic/hydrophilic

URL: http://lspi.inflpr.ro/