RT Journal Article
T1 Adsorption of water on porous Vycor glass studied by ellipsometry
A1 Álvarez Herrero, Alberto
A1 López Heredero, Raquel
A1 Levy, David
A1 Bernabeu Martínez, Eusebio
AB 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.
PB The Optical Society Of America
SN 1559-128X
YR 2001
FD 2001-02-01
LK https://hdl.handle.net/20.500.14352/59227
UL https://hdl.handle.net/20.500.14352/59227
LA eng
NO © Optical Society of America.The authors gratefully acknowledge the contribution of S. Martín Barbero for the adsorption measurements of N_2 and P. Valles González for the TEM micrographs. We are much indebted to A. Pérez Masia and A. Ruiz Paniego for enlightening discussions about adsorption in porous materials. We are grateful to H. Guerrero for his support of this study. This research has been partially supported by the Comisión Interministerial de Ciencia y Tecnología (CICYT), project ESP98-1332-C04-04.
NO Comisión Interministerial de Ciencia y Tecnología (CICYT)
DS Docta Complutense
RD 12 abr 2025