Photoinduced Superhydrophilic TiO2–PHEA/PS Photonic Crystal Composites with Vivid Structural Color, Self-Cleaning Ability, and Robust Structure,Advanced Materials Interfaces

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Photoinduced Superhydrophilic TiO2–PHEA/PS Photonic Crystal Composites with Vivid Structural Color, Self-Cleaning Ability, and Robust Structure
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2021-08-14 , DOI: 10.1002/admi.202100889
Yeguang Zhang ₁ , Yong Qi ₁ , Shufen Zhang ₁

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Due to its high refractive index, photocatalytic activity, and photoinduced superhydrophilicity, TiO₂ has advantages in photonic crystals (PCs). However, the composite of TiO₂ and PCs needs to be calcined at high temperatures, and the structural stability of the composites is poor. In this study, photoinduced superhydrophilic TiO₂–poly(hydroxyethyl acrylate)/polystyrene (PHEA/PS) PC composites with strong structural colors and self-cleaning are fabricated by coating triethanolamine-modified anatase TiO₂ nanoparticles-hydroxyethyl acrylate on the surface of PS PCs. The ordered arrays can be retained after the superficial layers of PS PCs are filled with TiO₂–PHEA, and vivid blue, green, and red composites can be obtained. The water contact angles of the composites can be reduced to 3° in 0.4 s, and superhydrophilicity can be maintained for 180 days in a laboratory environment. The declining superhydrophilicity can be restored under UV irradiation. The composites can degrade the adsorbed methylene blue under UV irradiation. Photocatalytic activity and superhydrophilicity impart self-cleaning ability on the composites. The locking of PS arrays by TiO₂–PHEA enhances the structural stability of the composites, making them resistant to water soaking and washing. Therefore, the composites show prospects for decoration, fabric coloring, and wearable electronic devices.

中文翻译：

具有鲜艳结构颜色、自清洁能力和坚固结构的光致超亲水 TiO2-PHEA/PS 光子晶体复合材料

由于其高折射率、光催化活性和光致超亲水性，TiO ₂在光子晶体（PC）中具有优势。然而，TiO ₂与PCs的复合材料需要经过高温煅烧，复合材料的结构稳定性较差。本研究通过在PS表面涂覆三乙醇胺修饰的锐钛矿型TiO ₂纳米颗粒-丙烯酸羟乙酯，制备了具有强结构色和自洁性的光致超亲水TiO _{2 -}聚（丙烯酸羟乙酯）/聚苯乙烯（PHEA/PS）PC复合材料。件。PS PCs的表层填充TiO ₂后可以保留有序阵列–PHEA，可以获得鲜艳的蓝色、绿色和红色复合材料。复合材料的水接触角可在 0.4 s 内降低至 3°，超亲水性可在实验室环境中保持 180 天。在紫外线照射下可以恢复下降的超亲水性。复合材料可以在紫外线照射下降解吸附的亚甲基蓝。光催化活性和超亲水性赋予复合材料自清洁能力。TiO ₂ -PHEA对 PS 阵列的锁定增强了复合材料的结构稳定性，使其耐水浸泡和洗涤。因此，该复合材料在装饰、织物着色和可穿戴电子设备方面具有广阔的前景。

更新日期：2021-09-12

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