This study aims to obtain mechanistic understanding of the formation and development of biomedical CaP coating on a model polymer surface of plasma treated polycaprolactone (PCL). Oxygen plasma treatment changed the surface morphology at nanometre scale and introduced negatively charged groups to PCL surface. Nucleation of CaP on the treated PCL surface occurred via two modes of growth, Volmer–Weber and Stranski–Krastanov. EDX and FTIR analysis suggested that the coating progressed from compositions with low Ca/P ratios and solubility to the phases of higher ratios and stability. The results also indicated that CaP clusters formed through Volmer–Weber mode were rich in the CaP phases of the higher Ca/P ratios. This study thus provided mechanistic insights into the coating process of CaP from solution onto functionalized surfaces which could be useful in designing coatings to suit different requirements.

中文翻译：

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从超饱和模拟体液中矿化等离子体处理的聚合物表面

本研究旨在对等离子处理的聚己内酯 (PCL) 的模型聚合物表面上生物医学 CaP 涂层的形成和发展获得机理理解。氧等离子体处理在纳米尺度上改变了表面形态，并将带负电荷的基团引入到 PCL 表面。经过处理的 PCL 表面上的 CaP 成核通过两种生长模式发生，Volmer-Weber 和 Stranski-Krastanov。EDX 和 FTIR 分析表明涂层从具有低 Ca/P 比率和溶解度的组合物发展到具有较高比率和稳定性的相。结果还表明，通过 Volmer-Weber 模式形成的 CaP 簇富含较高 Ca/P 比的 CaP 相。