A New Green Coating for the Protection of Frescoes: From the Synthesis to the Performances Evaluation
Source abstract
Abstract
This work presents the formulation and characterization of a new product for the protection of outdoor frescoes from aggressive environmental agents. The formulation is designed as an innovative green coating, prepared through a zero-waste one-pot-synthetic method to form silver nanoparticles (AgNPs) directly in a chitosan-based medium. The AgNPs are seeded and grown in a mixed hydrogel of chitosan, azelaic, and lactic acid, by the reduction of silver nitrate, and using calcium hydroxide as precipitating agent. The rheological properties of this coating base are optimized by the addition of a solvent mixture of glycerol and ethanol with a 1:1 volume ratio. The new formulation and two commercial products (Paraloid® B72 and Proconsol®) are then applied by brush to ad hoc mock-ups to be evaluated for chemical stability, color and gloss variations, morphological variation, hydrophobicity, and water vapor permeability via Fourier-transform infrared spectroscopy (FT-IR) in attenuated total reflection (ATR) mode, spectrophotometer analysis, stereomicroscope observations, UNI EN 15802, and UNI EN 15803, respectively. The results show that the application of the hybrid chitosan-AgNPs coating is promising for the protection of outdoor frescoes and that it can underpin the development of new products that address the lack of conservation strategies specifically designed for wall painting.
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Research context
OpenAlex topics: Nanoparticles: synthesis and applications · Building materials and conservation · Nanocomposite Films for Food Packaging
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
CATMAT Lab, Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Veneziaand, INSTM RUVe, 30170 Venice, Italy
Center for Cultural Heritage Technology, Istituto Italiano di Tecnologia, 30170 Venice, Italy
Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, 30170 Venice, Italy
Dipartimento di Fisica e Geologia, Università di Perugia, 06123 Perugia, Italy
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