Wang Kaili, Wang Zhong, Dong Youming, Zhang Shifeng, Li Jianzhang
Key Laboratory of Wood-Based Materials Science and Utilization, Beijing Forestry University, No. 35 Tsinghua East Road, Haidian District, Beijing 100083, China.
Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, No. 35 Tsinghua East Road, Haidian District, Beijing 100083, China.
Polymers (Basel). 2017 Aug 7;9(8):347. doi: 10.3390/polym9080347.
A versatile, fast, and nature-inspired polyphenol chemistry surface modification was applied to prepare superhydrophobic surfaces with micro-grooved structures in this study. Tannic acid and iron ion (TA⁻Fe) complexes were employed as a molecular building block for anchoring biomimetic coating onto the wood substrate with catalytically reducing formative Ag ions as the rough surface to ensure well-developed micro/nanostructure hierarchical roughness. TA⁻Fe complexes also acted as stable bridges between the substrate and hydrophobic groups. The thickness and architecture of TA⁻Fe complex coatings can be tailored by coordination-driven multistep assembly. The results indicated that the micro/nano hierarchical roughness structure was well-developed with increased coating times and increased deposition of reduced Ag nanoparticles, resulting in excellent superhydrophobic properties (e.g., water CA (contact angle) of about 156° and a rolling angle of about 4°). The superhydrophobic material exhibited outstanding stability and durability in harsh conditions, including strong acid/base or organic solvent, high-temperature water boiling, ultrasonic cleaning, and ultraviolet aging. A series of superhydrophobic models are proposed to clarify the effect of the micro/nano hierarchical structure on these superhydrophobic properties.
本研究采用一种通用、快速且受自然启发的多酚化学表面改性方法，制备具有微槽结构的超疏水表面。以单宁酸和铁离子（TA⁻Fe）配合物作为分子构建单元，通过催化还原形成的银离子作为粗糙表面，将仿生涂层锚定在木材基材上，以确保形成发达的微/纳米结构分级粗糙度。TA⁻Fe配合物还作为基材与疏水基团之间的稳定桥梁。TA⁻Fe配合物涂层的厚度和结构可通过配位驱动的多步组装进行调整。结果表明，随着涂层次数的增加和还原银纳米颗粒沉积量的增加，微/纳米分级粗糙度结构得到良好发展，从而产生优异的超疏水性能（例如，水接触角约为156°，滚动角约为4°）。该超疏水材料在包括强酸/碱或有机溶剂、高温水煮、超声清洗和紫外线老化在内的苛刻条件下表现出出色的稳定性和耐久性。提出了一系列超疏水模型，以阐明微/纳米分级结构对这些超疏水性能的影响。
