Silver nanoparticle-modified acrylic coatings demonstrate antimicrobial and antifungal activity while maintaining film structure, according to recent academic research.

Silver Nanoparticles in Waterborne Systems

Research published in Scientific Reports evaluated the incorporation of silver nanoparticles into water-based acrylic coatings to enhance antimicrobial performance. 

The study used an in-situ reduction process, where silver nanoparticles were synthesized within an acrylic polymer matrix using sodium acrylate. This approach produced a waterborne coating system containing embedded nanoparticles. 

Water-based acrylic coatings were selected due to their lower VOC content and widespread use across substrates including wood, metal and mineral surfaces. 

Impact on Coating Structure and Film Properties

Spectroscopic analysis using FTIR and UV–visible techniques indicated that the presence of silver nanoparticles did not alter the core functional groups of the acrylic polymer. 

Scanning electron microscopy showed the presence of nanoparticles within the coating film, with reported particle sizes around 19.7 nm. 

These results indicate that nanoparticles were incorporated into the polymer matrix while maintaining the base coating structure.

Antimicrobial and Antifungal Performance

The modified coatings were evaluated against multiple bacterial strains, including Escherichia coli, Acinetobacter baumannii, Klebsiella pneumoniae and Bacillus cereus. The nanoparticle-containing coatings showed measurable inhibition compared to the reference system without nanoparticles. 

Antifungal activity was also observed against Aspergillus niger, Aspergillus terreus and Rhizopus arrhizus. 

The study attributes antimicrobial performance to interactions between silver nanoparticles and microbial cells, which can disrupt cellular processes. 

Substrate Performance and Adhesion

Coated substrate testing showed antibacterial activity on stainless steel surfaces when nanoparticles were present, while coatings without nanoparticles did not show inhibition zones. 

Adhesion testing indicated improved performance at intermediate coating concentrations, with 50% and 80% formulations showing better results than undiluted samples. 

Source and Attribution

This article is based on research published by Phool Shahzadi et al. in Scientific Reports: “Polymeric coating doped with nanomaterials for functional impact on different substrates.”

Read the full study here: https://doi.org/10.1038/s41598-023-50462-0. 

Authors of the study:

• Phool Shahzadi — Glass and Ceramics Research Centre, PCSIR Labs Complex, Lahore, Pakistan
• Muhammad Amjad Majeed — Department of Chemistry, Government College University, Lahore, Pakistan
• Saba Ibrahim — Department of Chemistry, Government College University, Lahore, Pakistan
• Sabahat Asif — Department of Chemistry and Chemical Engineering, Lahore University of Management Sciences (LUMS), Lahore, Pakistan
• Irshad Hussain — Department of Chemistry and Chemical Engineering, Lahore University of Management Sciences (LUMS), Lahore, Pakistan
• Razia Kalsoom — PCSIR Laboratories, Islamabad, Pakistan

Explore more advances in antimicrobial coatings and how functional additives are shaping surface performance across industries.