Stability and activity of the polydopamine coating over time

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-03-09 DOI:10.1016/j.porgcoat.2025.109214

Krzysztof Moraczewski, Andrzej Trafarski, Magdalena Stepczyńska

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Abstract

The aim of this study was to assess the stability of polydopamine coatings over time and to determine the influence of the substrate type on their physicochemical properties. Polydopamine coatings were deposited on soda-lime glass, cellulose paper, and polycarbonate. The stability of the coatings was evaluated after one, two, and four weeks of conditioning using FTIR spectroscopy, SEM microscopy, EDS microanalysis, and contact angle measurements. The analyses revealed that polydopamine effectively covers the examined surfaces; however, its structure and uniformity depend on the substrate. On glass and polycarbonate, the coating formed a compact layer, whereas on paper, it developed a striated structure covering the cellulose fibers. Over time, a gradual decrease in nitrogen content in the surface layer was observed, suggesting polydopamine degradation, likely influenced by UV radiation. Contact angle measurements showed changes in coating hydrophilicity, which gradually returned to values characteristic of uncoated substrates over time. The reducing activity of polydopamine in silver deposition from an aqueous solution decreased by 40–60 % over time. Therefore, the study demonstrated that polydopamine stability depends on the substrate and storage conditions. UV radiation limits polydopamine activity, which should be considered for potential applications of the deposited coating.

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本研究旨在评估聚多巴胺涂层的长期稳定性，并确定基材类型对其理化特性的影响。聚多巴胺涂层沉积在钠钙玻璃、纤维素纸和聚碳酸酯上。使用傅立叶变换红外光谱、扫描电镜显微镜、EDS 显微分析和接触角测量法评估了涂层在调制一周、两周和四周后的稳定性。分析结果表明，聚多巴胺能有效覆盖受检表面，但其结构和均匀性取决于基底。在玻璃和聚碳酸酯上，涂层形成了一个紧密的层，而在纸张上，它形成了一个覆盖纤维素纤维的条纹结构。随着时间的推移，表层中的氮含量逐渐减少，这表明聚多巴胺可能受到紫外线辐射的影响而降解。接触角测量显示涂层亲水性发生了变化，随着时间的推移，亲水性逐渐恢复到未涂层基底的特征值。随着时间的推移，聚多巴胺在水溶液银沉积过程中的还原活性降低了 40-60%。因此，研究表明多巴胺的稳定性取决于基底和储存条件。紫外线辐射限制了多巴胺的活性，这一点应在沉积涂层的潜在应用中加以考虑。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.