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Long-Term Antibacterial and Antimildew Polyacrylate-Based TCS@ZIF-8 Leather Coatings Based on Encapsulation and
Jianzhong Ma1,2, Chongxin An3, Lei Zhang1,2
1College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
ACS Applied Materials & Interfaces
|May 2, 2025
Summary
This study developed a novel antibacterial coating using ZIF-8 nanoparticles to encapsulate triclosan (TCS). The resulting material offers long-term protection against bacteria and mold on surfaces like leather.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Developing durable antibacterial materials is crucial for public health and product longevity.
- Existing antimicrobial coatings often face challenges with stability and long-term efficacy.
- Metal-organic frameworks (MOFs) offer tunable properties for controlled release applications.
Purpose of the Study:
- To synthesize an acid-responsive zinc metal-organic framework (ZIF-8) for antibacterial applications.
- To encapsulate the broad-spectrum antibacterial agent triclosan (TCS) within ZIF-8 for slow release.
- To develop a polyacrylate (PA) nanocomposite emulsion incorporating TCS@ZIF-8 for enhanced antibacterial and antimildew coatings.
Main Methods:
- Synthesized ZIF-8 at room temperature via a solvent method.
- Encapsulated triclosan into ZIF-8 using an impregnation method, achieving 71.9% encapsulation and 25.1% drug loading.
- Prepared polyacrylate (PA)/TCS@ZIF-8 nanocomposite emulsion via physical blending.
- Coated leather with the nanocomposite emulsion using a spraying method.
Main Results:
- The PA/TCS@ZIF-8 nanocomposite film demonstrated 100% antibacterial rate against Escherichia coli and 97.3% against Staphylococcus aureus at 4.0 wt% TCS dosage.
- ZIF-8 disintegration in slightly acidic conditions triggered the release of Zn2+ and TCS, enhancing antimicrobial activity.
- Coated leather exhibited superior long-term antibacterial and antimildew performance, even after 30 days in a hot and humid environment (40 °C, 90% RH).
Conclusions:
- The developed PA/TCS@ZIF-8 nanocomposite emulsion provides an effective and long-lasting antibacterial and antimildew coating.
- The acid-responsive nature of ZIF-8 enables controlled release of active agents upon microbial presence.
- This technology holds significant potential for applications in leather, paper, textiles, and furniture, enhancing consumer protection.
