Environmental degradation of Modern non-balanced glasses

Teresa Palomar; Alexandra Rodrigues

doi:10.37558/gec.v17i1.690

Teresa Palomar Instituto de Cerámica y Vidrio (CSIC) http://orcid.org/0000-0002-3762-8788
Alexandra Rodrigues Unidade de investigação VICARTE “Vidro e Cerâmica para as Artes”, Universidade Nova de Lisboa, Campus de Caparica, FCT-UNL, Quinta da Torre, 2829-516 Caparica, Portugal http://orcid.org/0000-0002-4688-7159

DOI: https://doi.org/10.37558/gec.v17i1.690

Resumo

O crizzling é uma patologia de alteração relacionada com vidros de composição não equilibrada (elevado conteúdo de fundentes em relação a um baixo conteúdo de estabilizadores), que pode promover um dano inteso em vidros como a perda da transparência, aparecimento de gotículas na superfície ou (micro e macro-)fracturação. Neste trabalho, dois casos de estudo (ambientes exterior e interior) são apresentados. Foi observado que o maior agente de alteração destes vidros foi a água (chuva, condensação e humidade ambiental). No ambiente exterior, a chuva lavou os iões [OH⁻] formados durante a alteração, no entanto, a exposição a condições cíclicas acelerou a sua taxa de alteração. No ambiente interior, a higroscopicidade da superfície dos vidros atrai a humidade ambiental promovendo a deterioração.

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Biografias Autor

Teresa Palomar, Instituto de Cerámica y Vidrio (CSIC)

Doctor in Chemistry in the Autonoma University of Madrid in 2013 and Master in Conservation Science in the Pablo de Olavide University (Sevilla) in 2016. She has developed her scientific career in the Spanish National Research Council (CSIC), the Spanish Centre Foundation of Glass (FCNV) and the Research Unit VICARTE "Glass and Ceramic for the Arts" (Portugal). Currently, she is a postdoctoral researcher in the Institute of Ceramic and Glass (ICV-CSIC) with a contract to the Program Comfuturo “Un COMpromiso público privado con la ciencia y el FUTURO”. Her scientific career has been focused on the conservation of inorganic materials from cultural heritage, especially on glass and metal. She has received the Special Mention in the Young Researcher on Conservation Science Award 2018 organized by the Spanish group of the International Institute for Conservation of Historic and Artistic Works.

Alexandra Rodrigues, Unidade de investigação VICARTE “Vidro e Cerâmica para as Artes”, Universidade Nova de Lisboa, Campus de Caparica, FCT-UNL, Quinta da Torre, 2829-516 Caparica, Portugal

Master and Ph.D. in Conservation and Restoration, specialization in Conservation Science, by Faculty of Science and Technology NOVA University of Lisbon (FCT-NOVA), in 2019.

She has developed her scientific career in FCT-NOVA (Dep. Conservation and Restoration and Research Unit VICARTE "Glass and Ceramic for the Arts"), in collaboration with national cultural institutions such as Museu Nacional de Arte Antiga and National Palace of Pena (Portugal). She is currently a research fellow on the project NanoCStoneH (collaboration between Instituto Superior Técnico, Universidade de Lisboa, and Instituto Politécnico de Setúbal) granted by the Portuguese Foundation for Science and Technology, focused on the development of nanocomposite materials for consolidation of carbonate stone, and a VICARTE research member.

Her scientific career has been focused on the conservation of inorganic materials from cultural heritage, especially on glass and stained-glass (study and characterization of collections; of materials and production techniques; and of glass corrosion processes), and currently also on stone preservation.

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