Yang Tinghan, Wang Meng, Wang Xin, Di Xin, Wang Chengyu, Li Yudong
Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, No. 26, Hexing Road, Harbin, China.
Soft Matter. 2020 Apr 15;16(15):3678-3685. doi: 10.1039/c9sm02473e.
Superhydrophobic surfaces have received tremendous attention worldwide. However, the synthesis of a superhydrophobic surface possessing two paradoxical characteristic properties - stability and transparency, is a vital aspect that has been addressed in this paper. The surface was fabricated by an environmentally friendly process, which used distilled water for the dissolution of SiO2 nanoparticles in the presence of surfactants, instead of organic solvents. Moreover, the surface was transparent and had self-cleaning properties and stability. The optimal balance of roughness and multi-porous structure imparted excellent transparency to this surface. Importantly, both the conformal coating and the SiO2 nanoparticles embedded in the half solidified conformal coating contributed to the excellent stability, thus overcoming the paradox. The surface could withstand a temperature of 150 °C for 24 h and also different temperature regimes between 0-200 °C for 2 h. In addition, this surface could resist repeated scratches and abrasion as well as strong acids and alkali. The surface achieved its self-cleaning ability due to the introduction of surfactants containing the F element. This simple but novel strategy and surface have the advantages of high safety, low cost and environmental-friendliness.
超疏水表面在全球范围内受到了极大的关注。然而，合成具有稳定性和透明性这两种看似矛盾特性的超疏水表面，是本文所探讨的一个重要方面。该表面是通过一种环保工艺制备的，在表面活性剂存在的情况下，使用蒸馏水来溶解二氧化硅纳米颗粒，而不是有机溶剂。此外，该表面具有透明性、自清洁性能和稳定性。粗糙度和多孔结构的最佳平衡赋予了该表面优异的透明性。重要的是，保形涂层以及嵌入半固化保形涂层中的二氧化硅纳米颗粒都有助于实现优异的稳定性，从而克服了这一矛盾。该表面能够在150℃的温度下耐受24小时，也能在0 - 200℃的不同温度区间内耐受2小时。此外，该表面能够抵抗反复的刮擦和磨损以及强酸强碱。由于引入了含氟元素的表面活性剂，该表面实现了自清洁能力。这种简单而新颖的策略和表面具有高安全性、低成本和环境友好的优点。
