Abstract With deeper understanding of the harm of ultraviolet (UV) ray radiation, more and more attentions have been paid on developing UV shielding agents with better price-quality ratio. In this article, TiO₂ nanorods with three types of crystalline structures (anatase, brookite, and rutile) and their composites with natural illites were prepared by hydrothermal method under appropriate glycolic acid and pH environment. The resultant samples were analyzed by XRD, SEM, XPS, TEM, UV–vis spectrum and UV aging testing. The results confirm that both the aspect ratio and the crystalline structures of TiO₂ nanorods greatly affect the UV shielding performances of TiO₂ films. Compared with anatase and brookite, rutile TiO₂ nanorods with the best aspect ratio (around 3.5) display the best UV shielding performance. Furthermore, after loaded by natural illite micro-sheets, the illite-TiO2 composites display better UV shielding performance than pure TiO₂ nanorods, due to the physical reflection effect and interfacial coupling effect of illite micro-sheets. When the loading amount ratio reaches to 1:1, the illite-TiO2 composite loaded with rutile TiO₂ nanorods display the best UV shielding performance. And such coating is confirmed to be greatly helpful in protecting cotton fabrics from fractures caused by UV aging. The best illite-TiO2 composite can significantly increases the retention tensile strength of cotton fabrics by 47 % against UV radiation. The resultant novel illite-TiO2 composite provides a promising method to product better UV shielding agents for practical applications, which displays lower cost, nearly non-toxic, better aqueous dispersion, controlled UV–vis spectral characteristics, and higher UV shielding performances.

中文翻译：

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不同晶体结构中TiO2纳米棒和伊利石负载复合材料增强的紫外线屏蔽性能

摘要 随着对紫外线辐射危害认识的加深，开发性价比更高的紫外线屏蔽剂越来越受到重视。本文在适当的乙醇酸和pH环境下，采用水热法制备了具有三种晶体结构（锐钛矿、板钛矿和金红石）的TiO2纳米棒及其与天然伊利石的复合材料。通过XRD、SEM、XPS、TEM、UV-vis光谱和UV老化测试对所得样品进行分析。结果证实，TiO2 纳米棒的纵横比和晶体结构都极大地影响了 TiO2 薄膜的紫外线屏蔽性能。与锐钛矿和板钛矿相比，具有最佳纵横比（约 3.5）的金红石 TiO2 纳米棒显示出最佳的紫外线屏蔽性能。此外，由于伊利石微片的物理反射效应和界面耦合效应，伊利石-TiO2复合材料经天然伊利石微片负载后，表现出比纯TiO2纳米棒更好的紫外线屏蔽性能。当负载量比达到1:1时，负载金红石TiO2纳米棒的伊利石-TiO2复合材料表现出最佳的紫外屏蔽性能。并且这种涂层被证实对保护棉织物免受紫外线老化引起的断裂有很大帮助。最好的伊利石-TiO2 复合材料可以显着提高棉织物对紫外线辐射的保留拉伸强度 47%。由此产生的新型伊利石-TiO2 复合材料为生产用于实际应用的更好的紫外线屏蔽剂提供了一种有前途的方法，该方法显示出成本更低、几乎无毒、水分散性更好、