New ambient temperature liquid calcium alkoxides, [Ca(O(CH 2CH2O)3CH3)2] (1) and [Ca(O(CH2CH2O)3CH2CH 3)2] (2), together with [Ca(OCH2C(CH 3)3)2] (3), were synthesised by reaction of ammonia-activated calcium with the appropriate alcohol. Their potentiality as stone consolidant products was investigated and compared with those of other alkoxides: [Ca(OCH2CH3)2(CH3CH 2OH)4] (4), [Ca(OCH3)2] (5), [{Ca(OCH2CH2OCH3)2}9] (6), already described in the literature. Reaction of 1-3 with the atmosphere was studied, final products analysed and kinetic pathways investigated. The reaction produces CaCO3 and the vaterite/calcite ratios observed in the coatings generated from isopropyl alcohol solutions of 1-6 were found to considerably vary with the alkoxide precursor, which has a strong influence also on the morphology of the produced films. Furthermore, their efficiency as stone consolidants was tested by ultrasound measurements.

New calcium alkoxides for consolidation of carbonate rocks. Influence of precursors' characteristics on morphology, crystalline phase and consolidation effects

Ossola F;Tomasin P;El Habra N;Favaro M
2012

Abstract

New ambient temperature liquid calcium alkoxides, [Ca(O(CH 2CH2O)3CH3)2] (1) and [Ca(O(CH2CH2O)3CH2CH 3)2] (2), together with [Ca(OCH2C(CH 3)3)2] (3), were synthesised by reaction of ammonia-activated calcium with the appropriate alcohol. Their potentiality as stone consolidant products was investigated and compared with those of other alkoxides: [Ca(OCH2CH3)2(CH3CH 2OH)4] (4), [Ca(OCH3)2] (5), [{Ca(OCH2CH2OCH3)2}9] (6), already described in the literature. Reaction of 1-3 with the atmosphere was studied, final products analysed and kinetic pathways investigated. The reaction produces CaCO3 and the vaterite/calcite ratios observed in the coatings generated from isopropyl alcohol solutions of 1-6 were found to considerably vary with the alkoxide precursor, which has a strong influence also on the morphology of the produced films. Furthermore, their efficiency as stone consolidants was tested by ultrasound measurements.
2012
CHIMICA INORGANICA E DELLE SUPERFICI
Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia - ICMATE
calcium alkoxide
calcium carbonate
calcium derivative
carbonic acid
unclassified drug
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/20663
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