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. 2015 Oct 23;20(10):19463–19488. doi: 10.3390/molecules201019463

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© 2015 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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NIR monitoring of: (a) SiO₂; (b) ZrO₂; and (c) TiO₂ xerogels during water rehydration at 125 °C; (d) The intensity of the bands associated to physisorbed water is plotted as function of the rehydration time.