β Scribed by Cristina Vladuta; Luminita Andronic; Maria Visa; Anca Duta
No coin nor oath required. For personal study only.
The ceramic interface properties and morphology were estimated based on contact angle measurements. The contact angle, ΞΈ, was measured using different liquids (glycerol, NaCl 3.5% solution, oleic acid and ultra pure water) with known surface tensions. Correlations of the contact angle with the chemical bonds and morphology of thin films are presented. The thin films, deposited via Spray Pyrolysis Deposition (SPD) are TiO 2 (dense, porous) and WO 3 (dense, porous) films.
The interface properties of the ceramic layers were explained using the topography images obtained with Atomic Force Microscopy (AFM), and by measuring the contact angles and surface tensions.
The contact angles method is sensitive at high ΞΈ values. The experiments indicated that the recommended testing liquid is pure water, both for TiO 2 and WO 3 thin films, allowing a clear difference between dense and porous surfaces. The measurements were done at the initial moment of the contact drop-sample and with 1 s step up to 30 min. The presented results can be further used in optimizing the layer-by-layer deposition of thin films.
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