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— We have studied water vapor sorption properties of close-packed opal structures made up of monodisperse spherical silica particles 150 to 350 nm in diameter. The results attest to polymolecular water adsorption followed by capillary condensation in meso- and micropores within the structure-forming particles. The maximum adsorption value, ~0.13 g of H2O per gram of dry SiO2, essentially coincides...
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