School of Chemistry and Chemical Engineering, Chongqing University , Chongqing 400044 People's Republic of China.
ACS Appl Mater Interfaces. 2015 Jan 28;7(3):1449-57. doi: 10.1021/am505582j. Epub 2015 Jan 14.
The following facile approach has been developed to prepare a biomimetic-structural superhydrophobic surface with high stabilities and strong resistances on 2024 Al alloy that are robust to harsh environments. First, a simple hydrothermal treatment in a La(NO3)3 aqueous solution was used to fabricate ginkgo-leaf like nanostructures, resulting in a superhydrophilic surface on 2024 Al. Then a low-surface-energy compound, dodecafluoroheptyl-propyl-trimethoxylsilane (Actyflon-G502), was used to modify the superhydrophilic 2024 Al, changing the surface character from superhydrophilicity to superhydrophobicity. The water contact angle (WCA) of such a superhydrophobic surface reaches up to 160°, demonstrating excellent superhydrophobicity. Moreover, the as-prepared superhydrophobic surface shows high stabilities in air-storage, chemical and thermal environments, and has strong resistances to UV irradiation, corrosion, and abrasion. The WCAs of such a surface almost remain unchanged (160°) after storage in air for 80 days, exposure in 250 °C atmosphere for 24 h, and being exposed under UV irradiation for 24 h, are more than 144° whether in acidic or alkali medium, and are more than 150° after 48 h corrosion and after abrasion under 0.98 kPa for 1000 mm length. The remarkable durability of the as-prepared superhydrophobic surface can be attributed to its stable structure and composition, which are due to the existence of lanthanum (hydr)oxides in surface layer. The robustness of the as-prepared superhydrophobic surface to harsh environments will open their much wider applications. The fabricating approach for such robust superhydrophobic surface can be easily extended to other metals and alloys.
以下是一种简单的方法，可在 2024 铝合金上制备具有高稳定性和强耐腐蚀性的仿生结构超疏水表面，该表面在恶劣环境下表现出很强的鲁棒性。首先，在 La(NO3)3 水溶液中进行简单的水热处理，制备出银杏叶状纳米结构，使 2024Al 表面呈现超亲水。然后，使用低表面能化合物全氟庚基丙基三甲氧基硅烷（Actyflon-G502）对超亲水 2024Al 进行修饰，使表面性质由超亲水变为超疏水。这种超疏水表面的水接触角（WCA）高达 160°，表现出优异的超疏水性。此外，所制备的超疏水表面在空气储存、化学和热环境中具有很高的稳定性，对 UV 照射、腐蚀和磨损具有很强的抵抗力。这种表面在空气中储存 80 天后，在 250°C 气氛中暴露 24 小时，在 UV 照射下暴露 24 小时后，WCAs 几乎保持不变（160°），在酸性或碱性介质中超过 144°，腐蚀 48 小时后超过 150°，在 0.98 kPa 下磨损 1000 mm 长度后超过 150°。所制备的超疏水表面具有显著的耐久性，这归因于其稳定的结构和组成，这是由于表面层中存在镧（氢）氧化物。所制备的超疏水表面对恶劣环境的鲁棒性将为其更广泛的应用开辟道路。这种坚固的超疏水表面的制造方法可以很容易地扩展到其他金属和合金。
