J. Phys. IV France 125 (2005) 649-652
Adsorption and desorption kinetics in ZrO2 - TiO2 by photoacoustic techniquesA. Pinto Neto1, D. Moura2, C. Kuranaga3, M.D. Silva3 and L.C.M. Miranda3
1 Universidade Federal do Maranhão, UFMA, Brazil
2 Universidade de Taubaté, UNITAU, Brazil
3 Instituto Nacional de Pesquisas Espaciais, INPE, Brazil
In this paper we report on the photoacoustic (PA) characterization of ZrO2-TiO2 ceramic wafers as a sensing element for solvent adulteration evaluation. The experiments consisted of photoacoustic time dependent monitoring of the sorption and desorption of a droplet of a solvent deposited on the outer face of a ceramic wafer. The used solvents were isopropanol and chloroform. For the polar isopropanol molecule the results shown diffusion into the sample, with a characteristic diffusion time , accompanied by the evaporation at a rate with a time constant . Indeed, for the non polar chloroform, wetting-drying kinetics is adequately described by a simple diffusion-evaporation.
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