A New Methodological Approach to Correlate Protective and Microscopic Properties by Soft X-ray Microscopy and Solid State NMR Spectroscopy: The Case of Cusa’s Stone

Applied Sciences

Alberto Spinella¹  Francesco Armetta²  Maria Luisa Saladino²  Eugenio Caponetti²  Veronica Ciaramitaro²  Roberto Scaffaro³  Emmanuel Fortunato Gulino³  Alessandra Gianoncelli⁴  George Kourousias⁴ 

[1] Advanced Technologies Network (ATeN) Center, University of Palermo, Viale delle Scienze Bld.18, I-90128 Palermo, Italy;Department of Biological, Chemical, and Pharmaceutical Sciences and Technology (STEBICEF), University of Palermo, Viale delle Scienze Bld.17, I-90128 Palermo, Italy;Department of Engineering, University of Palermo, Viale delle Scienze Bld. 6, I-90128 Palermo, Italy;Elettra—Sincrotrone Trieste, Strada Statale 14-km 163,5 in AREA Science Park, Basovizza, I-34149 Trieste, Italy;

关键词: synchrotron soft X-ray microscopy;    solid state NMR spectroscopy;    ¹⁹F NMR;    stone protection;    physic-chemical interactions;    relaxation times;   

DOI  :  10.3390/app11135767

来源: DOAJ

【 摘 要 】

Hydrophobic treatment is one of the most important interventions usually carried out for the conservation of stone artefacts and monuments. The study here reported aims to answer a general question about how two polymers confer different protective performance. Two fluorinated-based polymer formulates applied on samples of Cusa’s stone confer a different level of water repellence and water vapour permeability. The observed protection action is here explained on the basis of chemico-physical interactions. The distribution of the polymer in the pore network was investigated using scanning electron microscopy and X-ray microscopy. The interactions between the stone substrate and the protective agents were investigated by means of solid state NMR spectroscopy. The ss-NMR findings reveal no significant changes in the chemical neighbourhood of the observed nuclei of each protective agent when applied onto the stone surface and provide information on the changes in the organization and dynamics of the studied systems, as well as on the mobility of polymer chains. This allowed us to explain the different macroscopic behaviours provided by each protective agent to the stone substrate.

【 授权许可】

Unknown