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<p>The introduction of fillers boosts the performance of polymer coatings and extends their service life. However, single component fillers are not sufficient for intelligent coatings, and compatibility between the polymer matrix and the filler remains a major challenge. In this study, functional polydopamine (PDA) modified CeO<sub>2</sub>/sodium-based montmorillonite (Na-MMT) or CeO<sub>2</sub>/calcium-based montmorillonite (Ca-MMT) fillers were designed and fabricated via facile in-situ method. The coatings incorporated with MMT-based fillers that were prepared demonstrated remarkable anti-corrosion capabilities, exceptional antimicrobial resistance, and rapid self-healing properties. Specifically, the low-frequency impedance (|<i>Z</i>|<sub>0.01&#xa0;Hz</sub>) values of PDA/CeO<sub>2</sub>/Na-MMT/EP and PDA/CeO<sub>2</sub>/Ca-MMT/EP, after being immersed for 30&#xa0;days, were sustained at 2.24 × 10<sup>7</sup> and 1.70 × 10<sup>7</sup>&#xa0;Ω cm<sup>2</sup>, respectively. Additionally, the bacteriostatic rates of the filler against <i>E. coli</i> and <i>S. aureus</i> can both reach above 99.9%, respectively, due to the photothermal effect and synergistic bacteriostatic mechanism of PDA and CeO<sub>2</sub>. The scratches healed rapidly within 40&#xa0;s under near-infrared (NIR) irradiation. This work provides valuable guidance for the utilization of MMT-based sheet fillers for enhanced corrosion-resistant, antimicrobial, and repairable coatings.</p> Graphical abstract <p></p>

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PDA and CeO2 synergistically functionalized montmorillonite nanosheets for reinforcing photothermal healing, antibacterial and anticorrosive coatings

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Zhi-Qiang Fang,
  • Guo-Qing Wang,
  • Zheng Li,
  • Lei Huang,
  • Yang-Kai Xiong,
  • Hao Jiang,
  • Si-Qi Liu,
  • Wen-Wen Li,
  • Ji-Peng Li,
  • Ping Zhang

摘要

The introduction of fillers boosts the performance of polymer coatings and extends their service life. However, single component fillers are not sufficient for intelligent coatings, and compatibility between the polymer matrix and the filler remains a major challenge. In this study, functional polydopamine (PDA) modified CeO2/sodium-based montmorillonite (Na-MMT) or CeO2/calcium-based montmorillonite (Ca-MMT) fillers were designed and fabricated via facile in-situ method. The coatings incorporated with MMT-based fillers that were prepared demonstrated remarkable anti-corrosion capabilities, exceptional antimicrobial resistance, and rapid self-healing properties. Specifically, the low-frequency impedance (|Z|0.01 Hz) values of PDA/CeO2/Na-MMT/EP and PDA/CeO2/Ca-MMT/EP, after being immersed for 30 days, were sustained at 2.24 × 107 and 1.70 × 107 Ω cm2, respectively. Additionally, the bacteriostatic rates of the filler against E. coli and S. aureus can both reach above 99.9%, respectively, due to the photothermal effect and synergistic bacteriostatic mechanism of PDA and CeO2. The scratches healed rapidly within 40 s under near-infrared (NIR) irradiation. This work provides valuable guidance for the utilization of MMT-based sheet fillers for enhanced corrosion-resistant, antimicrobial, and repairable coatings.

Graphical abstract