A novel synthesis route yields highly reactive nanobassanite with the largest surface area ever reported and with potential applications in biomedicine and heritage conservation.
New calcium alkoxides for consolidation of carbonate rocks. Influence of precursors' characteristics on morphology, crystalline phase and consolidation effects
作者:Franco Ossola、Patrizia Tomasin、Chiara De Zorzi、Naida El Habra、Matteo Chiurato、Monica Favaro
DOI:10.1039/c2nj40708f
日期:——
New ambient temperature liquid calcium alkoxides, [Ca(O(CH2CH2O)3CH3)2] (1) and [Ca(O(CH2CH2O)3CH2CH3)2] (2), together with [Ca(OCH2C(CH3)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(CH3CH2OH)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.
Method for producing polymeric sol of calcium phosphate compound and method for coating the same on a metal implant
申请人:Yu Seung Hyun
公开号:US20050158399A1
公开(公告)日:2005-07-21
Disclosed is a method for producing a transparent and homogenized polymeric sol of a calcium phosphate compound, containing apatite and having excellent wettability and bioactivity, according to a sol-gel synthesis, and a method for coating the polymeric sol on a metal implant, in which the polymeric sol is coated on the metal implant and then heat-treated to form a dense coated layer strongly bonded to the metal implant. The polymeric sol is obtained by process of preparing a calcium salt solution, containing calcium ethoxide dissolved in organic acid, and a phosphate solution, containing triethyl phosphite or triethyl phosphate dissolved in the organic acid, mixing the calcium salt solution with the phosphate solution to produce a mixed solution, and aging the mixed solution.