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Nanocellulose-Based Hybrid Materials for UV Blocking and Mechanically Robust Barriers
ACS Applied Bio Materials ( IF 4.6 ) Pub Date : 2020-03-10 , DOI: 10.1021/acsabm.0c00058 Tiffany Abitbol 1 , Anwar Ahniyaz 1 , Rubén Álvarez-Asencio 1 , Andreas Fall 1 , Agne Swerin 2
ACS Applied Bio Materials ( IF 4.6 ) Pub Date : 2020-03-10 , DOI: 10.1021/acsabm.0c00058 Tiffany Abitbol 1 , Anwar Ahniyaz 1 , Rubén Álvarez-Asencio 1 , Andreas Fall 1 , Agne Swerin 2
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Nanocellulose (NC)-based hybrid coatings and films containing CeO2 and SiO2 nanoparticles (NPs) to impart UV screening and hardness properties, respectively, were prepared by solvent casting. The NC film-forming component (75 wt % of the overall solids) was composed entirely of cellulose nanocrystals (CNCs) or of CNCs combined with cellulose nanofibrils (CNFs). Zeta potential measurements indicated that the four NP types (CNC, CNF, CeO2, and SiO2) were stably dispersed in water and negatively charged at pH values between 6 and 9. The combination of NPs within this pH range ensured uniform formulations and homogeneous coatings and films, which blocked UV light, the extent of which depended on film thickness and CeO2 NP content, while maintaining good transparency in the visible spectrum (∼80%). The addition of a low amount of CNFs (1%) reduced the film hardness, but this effect was compensated by the addition of SiO2 NPs. Chiral nematic self-assembly was observed in the mixed NC film; however, this ordering was disrupted by the addition of the oxide NPs. The roughness of the hybrid coatings was reduced by the inclusion of oxide NPs into the NC matrix perhaps because the spherical oxide NPs were able to pack into the spaces between cellulose fibrils. We envision these hybrid coatings and films in barrier applications, photovoltaics, cosmetic formulations, such as sunscreens, and for the care and maintenance of wood and glass surfaces, or other surfaces that require a smooth, hard, and transparent finish and protection from UV damage.
中文翻译：
用于紫外线阻挡和机械坚固屏障的纳米纤维素基混合材料
通过溶剂浇铸制备了基于纳米纤维素 (NC) 的混合涂层和含有 CeO 2和 SiO 2纳米颗粒 (NPs) 的薄膜，分别赋予紫外线屏蔽和硬度特性。NC 成膜组分（占总固体的 75 wt%）完全由纤维素纳米晶体 (CNC) 或与纤维素纳米纤丝 (CNF) 结合的 CNC 组成。Zeta 电位测量表明，四种 NP 类型（CNC、CNF、CeO 2和 SiO 2）在 6 至 9 之间的 pH 值下稳定分散在水中并带负电。在此 pH 范围内的 NP 组合确保了均匀的配方和均质阻挡紫外线的涂层和薄膜，其程度取决于薄膜厚度和 CeO 2NP 含量，同时在可见光谱中保持良好的透明度（~80%）。添加少量 CNF (1%) 会降低薄膜硬度，但这种影响通过添加 SiO 2得到补偿NP。在混合NC薄膜中观察到手性向列自组装；然而，这种排序被氧化物纳米粒子的加入打乱了。混合涂层的粗糙度通过将氧化物 NP 包含到 NC 基质中而降低，这可能是因为球形氧化物 NP 能够填充到纤维素原纤维之间的空间中。我们设想这些混合涂料和薄膜可用于阻隔应用、光伏、化妆品配方（如防晒霜）以及木材和玻璃表面或其他需要光滑、坚硬和透明饰面并防止紫外线损伤的表面的护理和维护.
更新日期：2020-04-23
中文翻译：
用于紫外线阻挡和机械坚固屏障的纳米纤维素基混合材料
通过溶剂浇铸制备了基于纳米纤维素 (NC) 的混合涂层和含有 CeO 2和 SiO 2纳米颗粒 (NPs) 的薄膜，分别赋予紫外线屏蔽和硬度特性。NC 成膜组分（占总固体的 75 wt%）完全由纤维素纳米晶体 (CNC) 或与纤维素纳米纤丝 (CNF) 结合的 CNC 组成。Zeta 电位测量表明，四种 NP 类型（CNC、CNF、CeO 2和 SiO 2）在 6 至 9 之间的 pH 值下稳定分散在水中并带负电。在此 pH 范围内的 NP 组合确保了均匀的配方和均质阻挡紫外线的涂层和薄膜，其程度取决于薄膜厚度和 CeO 2NP 含量，同时在可见光谱中保持良好的透明度（~80%）。添加少量 CNF (1%) 会降低薄膜硬度，但这种影响通过添加 SiO 2得到补偿NP。在混合NC薄膜中观察到手性向列自组装；然而，这种排序被氧化物纳米粒子的加入打乱了。混合涂层的粗糙度通过将氧化物 NP 包含到 NC 基质中而降低，这可能是因为球形氧化物 NP 能够填充到纤维素原纤维之间的空间中。我们设想这些混合涂料和薄膜可用于阻隔应用、光伏、化妆品配方（如防晒霜）以及木材和玻璃表面或其他需要光滑、坚硬和透明饰面并防止紫外线损伤的表面的护理和维护.
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