Počet záznamů: 1
Temperature-related degradation and colour changes of historic paintings containing vivianite
- 1.
SYSNO ASEP 0442179 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Temperature-related degradation and colour changes of historic paintings containing vivianite Tvůrce(i) Čermáková, Zdeňka (UACH-T) SAI
Švarcová, Silvie (UACH-T) SAI, RID, ORCID
Hradilová, J. (CZ)
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Lančok, Adriana (UACH-T) ORCID, RID, SAI
Vašutová, V. (CZ)
Blažek, Jan (UTIA-B) RID, ORCID
Hradil, David (UACH-T) RID, SAIZdroj.dok. Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy. - : Elsevier - ISSN 1386-1425
Roč. 140, APR (2015), s. 101-110Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Degradation ; High-temperature X-ray diffraction ; Model experiments ; Mossbauer spectroscopy ; Vivianite Vědní obor RIV CA - Anorganická chemie Obor OECD Inorganic and nuclear chemistry CEP GAP103/12/2211 GA ČR - Grantová agentura ČR Institucionální podpora UACH-T - RVO:61388980 ; UTIA-B - RVO:67985556 UT WOS 000350939200012 EID SCOPUS 84937107577 DOI 10.1016/j.saa.2014.12.082 Anotace Temperature-related degradation of pure synthetic as well as partly oxidised natural vivianite has been studied by high-temperature X-ray diffraction (HT-XRD) covering the whole extent of the temperature-related stability of its structure. While temperatures around 70°C are already damaging to vivianite, exposition to 160°C results in complete amorphisation of both the vivianite and its oxidation products. As indicated by Mossbauer spectroscopy, temperature-induced oxidation of vivianite starts at 90°C. To study the occurring structural as well as accompanying colour changes in more detail, model vivianite paint layer samples with different historic binders were prepared and subjected to increased temperatures. Exposition to 80°C caused pronounced colour changes of all the samples: ground natural blue vivianite became grey - a colour change which has been described in actual works of art. Regarding the binders, the oil seemed to facilitate the transfer of heat to vivianite's grains. To simulate conditions of conservation treatment under which the painting is exposed to increased temperatures, oil-on-canvas mock-ups with vivianite were prepared and relined in a traditional way using iron. The treatment affected preferentially larger grains of vivianite; the micro-samples documented their change to grey, and their Raman spectra showed the change from vivianite to metavivianite. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2016
Počet záznamů: 1