%0 Journal Article
%A Álvarez Herrero, Alberto
%A López Heredero, Raquel
%A Levy, David
%A Bernabeu Martínez, Eusebio
%T Adsorption of water on porous Vycor glass studied by ellipsometry
%D 2001
%@ 1559-128X
%U https://hdl.handle.net/20.500.14352/59227
%X The variation of the optical properties of porous Vycor glass (Corning, Model 7930) under different relative-humidity conditions was studied. The adsorption of water into the glass pores was investigated with spectroscopic ellipsometry. The change of the refractive index was Δn ∼ 0.04 between 5% and 90% relative humidity. A linear relation between the ellipsometer parameter tan Ψ, the amount of water adsorbed in the glass pores, and information about the pore-size distributions was established. The results are in accord with the values obtained from N2 isotherms, transmission electron microscope micrographs, and the manufacturer’s specifications (radius of ∼20 Å). The possibility of using this material as a transducer for implementation in a fiber-optic sensor to measure humidity was evaluated.
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