In the past few years, the NYMPHA project tried to propose a new solution for the restoration and protection of polymaterial surfaces through a new green product. As result of the efforts implemented within the NYMPHA project, the use of a mixture of polysaccharides extracted from microalgae cells (Masi et al., 2021) was tested to evaluate its multi-applicability on different materials constituting Cultural Heritage. Several specimens were realized, with multiple materials, in order to test the characteristics of the NYMPHA extract as additive in restoration mortars and as consolidating product for the paint layers on inorganic surfaces (i.e. marble). Indeed, a number of mortar specimens were made varying the addition made to the fresh mortar, whether it consisted in an additive with different nature or a different concentration of it. At the same time, different marble blocks were painted with 4 techniques (egg tempera, tempera grassa, oil painting and glue-tempera) using two pigment-binder ratios. To verify the efficacy of the application of the NYMPHA extract, a multi-analytical approach was selected, combining both laboratory and in-situ techniques used to date by restorers and conservation scientists. For this purpose, SEM-EDS, XRPD and FT-IR were applied to the samples, as well as peeling test and sponge test. In addition, the microbial activity was tested. The analyses were conducted on normal and artificially aged sample, to allow the evaluation of variations of the product over time and, in the case of paintings, to assess the effect of NYMPHA in consolidating ancient-like painting layers. Acknowledgments This work is supported by POR FESR Progetti Gruppi di Ricerca Lazio Innova NYMPHA Project A0375-2020-36489. Reference Masi, Annalisa, Medeghini, L., Masi, Alessia, Sadori, L., Leonelli, F., Favero, G., Antonacci, A., 2021. Natural polysaccharides from microalgae for the protection of cultural heritage. SEL 16, 24. https://doi.org/10.30441/smartelab.v16i.127
Application of microalgae polysaccharides as a new sustainable product for conservation of Cultural Heritage / Fratello, Chiara; Paglialunga, Giulia; DI FAZIO, Melania; Aibéo, Cristina; Simon, Stefan; Furche, Andreas; Benedetti, Francesca; Kratter, Matilde; Rinaldi, Teresa; Leonelli, Francesca; Medeghini, Laura. - (2023). (Intervento presentato al convegno 4° Convegno annuale del Centro di Eccellenza DTC Lazio -Tecnologie e patrimonio culturale: nuove competenze e professioni tenutosi a Aula Magna, Rettorato, Sapienza - Roma).
Application of microalgae polysaccharides as a new sustainable product for conservation of Cultural Heritage
Chiara Fratello;Giulia Paglialunga;Melania Di Fazio
;Francesca Benedetti;Matilde Kratter;Teresa Rinaldi;Francesca Leonelli;Laura MedeghiniUltimo
2023
Abstract
In the past few years, the NYMPHA project tried to propose a new solution for the restoration and protection of polymaterial surfaces through a new green product. As result of the efforts implemented within the NYMPHA project, the use of a mixture of polysaccharides extracted from microalgae cells (Masi et al., 2021) was tested to evaluate its multi-applicability on different materials constituting Cultural Heritage. Several specimens were realized, with multiple materials, in order to test the characteristics of the NYMPHA extract as additive in restoration mortars and as consolidating product for the paint layers on inorganic surfaces (i.e. marble). Indeed, a number of mortar specimens were made varying the addition made to the fresh mortar, whether it consisted in an additive with different nature or a different concentration of it. At the same time, different marble blocks were painted with 4 techniques (egg tempera, tempera grassa, oil painting and glue-tempera) using two pigment-binder ratios. To verify the efficacy of the application of the NYMPHA extract, a multi-analytical approach was selected, combining both laboratory and in-situ techniques used to date by restorers and conservation scientists. For this purpose, SEM-EDS, XRPD and FT-IR were applied to the samples, as well as peeling test and sponge test. In addition, the microbial activity was tested. The analyses were conducted on normal and artificially aged sample, to allow the evaluation of variations of the product over time and, in the case of paintings, to assess the effect of NYMPHA in consolidating ancient-like painting layers. Acknowledgments This work is supported by POR FESR Progetti Gruppi di Ricerca Lazio Innova NYMPHA Project A0375-2020-36489. Reference Masi, Annalisa, Medeghini, L., Masi, Alessia, Sadori, L., Leonelli, F., Favero, G., Antonacci, A., 2021. Natural polysaccharides from microalgae for the protection of cultural heritage. SEL 16, 24. https://doi.org/10.30441/smartelab.v16i.127I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
