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Cellulose Acetate Incorporating Organically Functionalized CeO2 NPs: Efficient Materials for UV Filtering Applications

机译：醋酸纤维素掺入有机官能化的CEO2 NPS：用于紫外线过滤应用的有效材料

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One of the major issues faced when constructing various materials incorporating inorganic nanoparticles (NPs) is aggregation leading to loss of their final activity. In our work, cellulose acetate (CA) has been used to serve as matrix for the synthesis of UV-shielding and transparent films containing various amounts (1–5 wt.%) of cerium oxide (CeO ) NPs. In order to attain an improved dispersion and a better connectivity between NPs and the cellulose matrix, the surface of CeO NPs have been previously functionalized by the reaction with 3-aminopropyl(diethoxy)methylsilane (APDMS). The uniform dispersion of the NPs in the homogeneous thin films has been evidenced by using Transmission Electron Microscopy (TEM) and Fourier Transformation Infrared Spectroscopy (FTIR) characterization. The investigation of the optical properties for the hybrid films through UV-Vis spectroscopy revealed that the presence of CeO NPs in the CA matrix determined the appearance of strong UV absorption bands in the region 312–317 nm, which supports their use as efficient UV absorbers. This study has shown that UV shielding ability of the nanocomposites can be easily tuned by adjusting the numberof inorganic NPs in the CA template.
机译：在构建包含无机纳米颗粒（NPS）的各种材料时面临的主要问题之一是聚集导致其最终活动的丧失。在我们的作品中，醋酸纤维素（CA）已被用于合成含有各种量（1-5重量％）氧化铈（CeO）NPS的紫外线屏蔽和透明膜的基质。为了获得改善的分散和NPS和纤维素基质之间的更好的连接性，通过与3-氨基丙基（二乙氧基）甲基硅烷（APDMS）的反应，CEO NPS的表面已经通过反应官能化。通过使用透射电子显微镜（TEM）和傅里叶变换红外光谱（FTIR）表征，已经通过透射电子显微镜（FTIR）表征已经证明了NPS在均匀薄膜中的均匀分散。通过UV-Vis光谱对杂种膜的光学性质的研究发现，CA基质中CEO NP的存在确定了412-317nm的强紫外吸收带的外观，其支持其用作高效的UV吸收器。该研究表明，通过调节Ca模板中的无机NPS，可以容易地调整纳米复合材料的UV屏蔽能力。

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