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DRIFT spectra of 4-TBN on silica gel (a) at zero time after adsorption; (b) after 1 day; (c) after 3 days; (d) after 6 days; (e) after 8 days at room temperature and (I) water-saturated atmosphere, and (II) vacuum conditions. Reprinted with permission from [92]. Copyright Elsevier, 2005.
