INFINA (EX INFIP)   05545
INSTITUTO DE FISICA INTERDISCIPLINARIA Y APLICADA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Study of the wettability of TiO2 films treated with a dielectric barrier discharge
Autor/es:
ARIEL KLEIMAN ; LEANDRO GIULIANI; PABLO MARRELLI; LINA MARIA FRANCO ARIAS; MARIANA FAZIO; JUAN MATÍN CABALEIRO; ADRIANA MÁRQUEZ; DIANA GRONDONA
Lugar:
João Pessoa ? PB
Reunión:
Congreso; XIII Encontro da SBPMat área Surface Engineering - functional coatings and modified surfaces,; 2014
Resumen:
Titanium dioxide has been the subject of several investigations due to its outstanding physical and chemical properties, which turn it in a material suitable for a great variety of applications. One of the most studied surface properties of TiO2 is the super-hydrophilic nature acquired when irradiated with UV light. Cathodic arc deposition (CAD) has demonstrated to be an efficient technique for the synthesis of TiO2 thin films, yielding highly uniform and compact coatings with good adhesion to the substrates. In this work, the wettability of nano-crystalline TiO2 films grown by CAD and treated with a dielectric barrier discharge (DBD) was studied. The DBD was run in air at atmospheric pressure and the exposure time of the samples was varied from 10 to 600 s. The wettability was evaluated through contact angle measurements using deionized water droplets of 20 μl. Changes in the contact angle were also studied for the films under irradiation from a UV lamp in order to set a reference. It was found that the DBD turned the films super-hydrophilic faster than the UV irradiation from the lamp; the contact angle varying from ~80º to less than 10º in approximately 30 s with the DBD and 5 min with the UV lamp. Also, the time taken to recover the initial contact angle in the dark was significantly lower for the DBD-treated films. The surface morphology of the films was studied by atomic force microscopy; the films exposed to the DBD presenting lower grain size and slightly higher surface roughness.