Preparation of Stable Superhydrophobic Coatings on Wood Substrate Surfaces via Mussel-Inspired Polydopamine and Electroless Deposition Methods
Preparation of Stable Superhydrophobic Coatings on Wood Substrate Surfaces via Mussel-Inspired Polydopamine and Electroless Deposition Methods
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DOI：
10.3390/polym9060218
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发表时间：
2017-06-01
期刊：
影响因子：
5
通讯作者：
Li, Jianzhang
中科院分区：
文献类型：
--
作者：
Wang, Kaili;Dong, Youming;Li, Jianzhang
采用贻贝启发的聚多巴胺（PDA）化学和化学沉积方法在木材表面制备稳定的超疏水涂层。在木材表面上形成的PDA涂层表现出分级的微/纳米粗糙结构，并且通过PDA上的邻苯二酚部分的金属螯合能力在基底和金属膜之间起到“粘合层”的作用，从而允许形成发育良好的微/纳米结构分级粗糙度。此外，涂层充当基底和疏水基团之间的稳定桥梁。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）对超疏水木材表面的形貌和化学成分进行了表征。PDA和十八胺（OA）改性的表面显示出优异的超疏水性，具有约153度的水接触角（CA）和约9度的滚动角（RA）。利用Cu金属化，CA进一步增加到约157度，RA减小到约5度。该超疏水材料在紫外光老化、超声波洗涤、强酸碱和有机溶剂浸泡以及高温水煮等苛刻条件下均表现出优异的稳定性。结果表明，PDA/OA层足以在木材基材上赋予稳健的、抗降解的超疏水性。Cu金属化对于提供超疏水性质的显著改善可能是不必要的。然而，由于PDA的惊人的粘附能力，无电沉积技术可能允许在仿生材料中的广泛的潜在应用。
Mussel-inspired polydopamine (PDA) chemistry and electroless deposition approaches were used to prepare stable superhydrophobic coatings on wood surfaces. The as-formed PDA coating on a wood surface exhibited a hierarchical micro/nano roughness structure, and functioned as an "adhesive layer" between the substrate and a metallic film by the metal chelating ability of the catechol moieties on PDA, allowing for the formation of a well-developed micro/nanostructure hierarchical roughness. Additionally, the coating acted as a stable bridge between the substrate and hydrophobic groups. The morphology and chemical components of the prepared superhydrophobic wood surfaces were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The PDA and octadecylamine (OA) modified surface showed excellent superhydrophobicity with a water contact angle (CA) of about 153 degrees and a rolling angle (RA) of about 9 degrees. The CA further increased to about 157 degrees and RA reduced to about 5 degrees with the Cu metallization. The superhydrophobic material exhibited outstanding stability in harsh conditions including ultraviolet aging, ultrasonic washing, strong acid-base and organic solvent immersion, and high-temperature water boiling. The results suggested that the PDA/OA layers were good enough to confer robust, degradation-resistant superhydrophobicity on wood substrates. The Cu metallization was likely unnecessary to provide significant improvements in superhydrophobic property. However, due to the amazing adhesive capacity of PDA, the electroless deposition technique may allow for a wide range of potential applications in biomimetic materials.