http://www.cnr.it/ontology/cnr/individuo/prodotto/ID306734
Phase transformation of calcium oxalate dihydrate-monohydrate: Effects of relative humidity and new spectroscopic data (Articolo in rivista)
- Type
- Label
- Phase transformation of calcium oxalate dihydrate-monohydrate: Effects of relative humidity and new spectroscopic data (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.saa.2014.02.182 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Conti C.; Casati M.; Colombo C.; Realini M.; Brambilla L.; Zerbi G. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
- http://www.scopus.com/inward/record.url?eid=2-s2.0-84897406589&partnerID=q2rCbXpz (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto per la Conservazione e la Valorizzazione Dei Beni Culturali, CNR, Via Cozzi 53, 20125 Milano, Italy; Dip. Scienze Ambiente, Territorio e Scienze della Terra, Università Degli Studi di Milano Bicocca, Piazza della Scienza 1, 20126 Milano, Italy; Dip. Chimica, Materiali e Ingegneria Chimica Giulio Natta, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy (literal)
- Titolo
- Phase transformation of calcium oxalate dihydrate-monohydrate: Effects of relative humidity and new spectroscopic data (literal)
- Abstract
- New data on vibrational properties of calcium oxalates and their controversial transformation mechanism
are presented. We have focused on whewellite (CaC2O4?H2O) and weddellite [CaC2O4?(2 + x) H2O],
the most common phases of calcium oxalate; these compounds occur in many organisms, in kidney
stones and in particular kinds of films found on the surface of many works of art. Low temperature experiments
carried out by Fourier transform infrared spectroscopy have highlighted both the high structural
order in the crystalline state of whewellite and the disordered distribution of the zeolitic water molecules
in weddellite. The synthesised nanocrystals of weddellite have been kept under different hygrometric
conditions in order to study, by X-ray powder diffraction, the role of ''external'' water molecules on their
stability. Moreover, in order to identify the different kinds of water molecules, a re-investigation, supported
by quantum chemical calculations, of the observed vibrational spectra (IR and Raman) of whewellite
has been conducted. (literal)
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