Andreja Pondelak (Avtor), Francesca Rosi (Avtor), Celeste Maurich (Avtor), Costanza Miliani (Avtor), Srečo D. Škapin (Avtor), Andrijana Sever Škapin (Avtor)

Povzetek

Calcium acetoacetate, Ca(OAcAc)2, was exposed 7, 30 and 365 days to different values of relative humidity (33%, 48%, 75% and 96%) at 40 °C in order to study its transformation to CaCO3. The resulting Ca(OAcAc)2 decomposition and the time dependence of the phase transformations were monitored and critically evaluated by Fourier transform infrared spectroscopy, field emission scanning electron microscopy and X-ray powder diffraction. The impact of relative humidity on CaCO3 polymorph formation was thoroughly assessed. In all of the conditions used and for all ageing periods, the formed crystal structure is found to be vaterite. At the lowest relative humidity (33%), the amorphous CaCO3 remains more or less almost untransformed even after one year of exposure. It is proposed that the reason for the stability of amorphous CaCO3 is due to the limited amount of physisorbed water on the surfaces of the particles, which is considered the driving force for its transformation. However, the carbonation process is faster in the case of the highest humidity (96%). The findings are not only important for better solutions in the field of cultural heritage, but also shed new light on the fundamental mechanism of CaCO3 crystallization.

Ključne besede

kalcijev acetoacetat;relativna vlažnost;karbonatizacija;amorfni karbonat;vaterit;mehanizem;calcium acetoacetate;relative humidity;carbonation;amorphous carbonate;vaterite;mechanism;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: ZAG - Zavod za gradbeništvo Slovenije
Založnik: North-Holland
UDK: 54
COBISS: 2500199 Povezava se bo odprla v novem oknu
ISSN: 0169-4332
Št. ogledov: 4
Št. prenosov: 4
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: kalcijev acetoacetat;relativna vlažnost;karbonatizacija;amorfni karbonat;vaterit;mehanizem;
Čas izdaje: Nov. 2019
DOI: 10.1016/j.apsusc.2019.144768
ID: 21172243