A Two-Step Surface Modification Methodology for the Advanced Protection of a Stone Surface

Area of Science:

• Materials Science
• Conservation Science
• Nanotechnology

Background:

• Biodeterioration of natural stone surfaces on monuments and buildings poses significant conservation challenges.
• Climatic variations and biological systems contribute to stone appearance changes and deterioration.
• Effective protection strategies are crucial for preserving historical structures and public claddings.

Purpose of the Study:

• To investigate the use of nanotechnology, specifically silver nanoparticles (AgNPs), for protecting natural stone surfaces.
• To evaluate the efficacy of siloxane coupling agents with thiol groups in immobilizing AgNPs on stone.
• To compare the performance of different coupling agents in preventing microbial biofilm formation on porous stone structures.

Main Methods:

• Modification of natural stone surfaces using siloxane coupling agents functionalized with thiol groups.
• Immobilization of laboratory-synthesized silver nanoparticles (AgNPs) onto the modified stone surfaces.
• Antimicrobial analysis to assess the reduction in microbial biofilm formation.

Main Results:

• Successful fixation of silver nanoparticles (AgNPs) onto two common types of natural stone.
• Demonstrated antimicrobial activity of the AgNP-treated surfaces against biofilm formation.
• Comparative analysis highlighted the efficiency of specific coupling agents in enhancing AgNP performance.

Conclusions:

• Nanotechnology, particularly AgNPs coupled with tailored agents, offers a viable solution for natural stone surface protection.
• The developed method effectively reduces microbial biofilm formation, a key factor in stone biodeterioration.
• This approach presents a promising strategy for the long-term conservation of stone heritage and structures.