A New Green Coating for the Protection of Frescoes: From the Synthesis to the Performances Evaluation

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...

Full description

Saved in:
Bibliographic Details
Published in:Coatings (Basel) 2023-02, Vol.13 (2), p.277
Main Authors: Lamuraglia, Raffaella, Campostrini, Andrea, Ghedini, Elena, De Lorenzi Pezzolo, Alessandra, Di Michele, Alessandro, Franceschin, Giulia, Menegazzo, Federica, Signoretto, Michela, Traviglia, Arianna
Format: Article
Language:English
Subjects:
Acids
Antimicrobial agents
Biopolymers
Chitosan
Coatings
Cultural heritage
Ethanol
Fourier transforms
Gloss
Glycerol
Historic buildings
Hydrogels
Hydrophobicity
Infrared analysis
Infrared spectroscopy
Lactic acid
Life sciences
Microorganisms
Mural painting and decoration
Nanoparticles
Polymers
Product development
Protective coatings
Rheological properties
Rheology
Silver
Silver nitrate
Slaked lime
Stability analysis
Water vapor
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings13020277