School of Materials Science and Engineering , Wuhan University of Technology , Wuhan 430070 , China.
ACS Appl Mater Interfaces. 2019 Feb 20;11(7):7488-7497. doi: 10.1021/acsami.9b00886. Epub 2019 Feb 6.
Durability under UV illumination remains a big challenge of TiO-based superhydrophobic coatings, with the photocatalytic effect causing degradation of low-surface-energy material over time, resulting in the surfaces losing their hydrophobicity. We report surfaces made from tolylene-2,4-diisocyanate (TDI)/TiO hybrid networks that demonstrate superhydrophobicity and superior UV durability. Structural and morphological studies reveal that the TDI/TiO hybrid networks are composed of TiO nanoparticles interconnected with TDI bridges and then encapsulated by a TDI layer. Through controlling the fraction of TDI in the synthesis process, the thickness of the TDI encapsulation layer around the TDI/TiO hybrid networks can be varied. When the weight ratio of TDI/TiO is 5:1, the superhydrophobicity of the hybrid network surface remains almost unchanged after a month of continuous UV illumination. This hybrid network surface can also clean methylene blue solution through the synergistic effects of cation adsorption and photocatalysis, holding promising potential for applications toward reducing cation pollutions in both liquid and air environments.
在紫外光照射下的耐久性仍然是基于 TiO2 的超疏水涂层的一个巨大挑战，光催化作用会导致低表面能材料随着时间的推移降解，从而使表面失去疏水性。我们报告了由甲苯-2,4-二异氰酸酯（TDI）/TiO2 杂化网络制成的表面，这些表面表现出超疏水性和优异的耐紫外光性。结构和形态研究表明，TDI/TiO2 杂化网络由 TiO2 纳米粒子与 TDI 桥相互连接，然后被 TDI 层包裹。通过控制合成过程中 TDI 的比例，可以改变 TDI/TiO2 杂化网络周围 TDI 封装层的厚度。当 TDI/TiO2 的重量比为 5:1 时，混合网络表面的超疏水性在连续紫外光照射一个月后几乎保持不变。这种杂化网络表面还可以通过阳离子吸附和光催化的协同作用来清洁亚甲基蓝溶液，在减少液体和空气环境中的阳离子污染方面具有广阔的应用前景。
