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Influence of alcohol treatments on properties of silk-fibroin-based films for highly optically transparent coating applications

机译：醇处理对高光学透明涂料应用的丝纤维蛋白基膜性能的影响

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Thin films of silk fibroin were prepared by solvent evaporation from calcium chloride/ethanol aqueous solution. The influence of alcohol treatments on thermal, mechanical and optical properties of silk-fibroin-based film is presented. To understand the conformal structure of the alcohol-treated silk fibroin film, the IR spectral decomposition method is employed. The optical properties especially the optical transparency, haze and fluorescence emission of alcohol-treated silk fibroin film is systematically investigated together with the conformal structure to understand the effect of the fibril such as the beta-sheet influencing the optical properties. Monohydric alcohol treatment increased beta-turn content in the regenerated silk fibroin structure. These affected the amount of light diffusion and scattering within silk-fibroin films. With alcohol-treatment, all the silk-fibroin films exhibit exceptional optical transparency (>90%) with different levels of optical haze (2.56–14.17%). In particular, ethanol-treated silk-fibroin films contain the highest content of beta-turns (22.8%). The ethanol-treated silk-fibroin films displayed a distinct interference of oscillating crests and troughs in the UV-Vis transmittance spectra, thereby showing the lowest optical haze of 2.56%. In contrast, the silk-fibroin films treated with methanol and propanol exhibit the highest (14.17%) and second-highest (10.29%) optical transmittance haze, respectively. The beta-turn content of the silk-fibroin films treated with methanol is the lowest (20.5%). These results show the relationship between the beta-turn content and optical haze properties. The results manifestly provide a method to manufacture exceptional optically transparent silk-fibroin films with adjustable light diffusion and scattering which can be designed to meet specific applications with the potential to provide UV-shielding protection via monohydric alcohol treatment.
机译：通过从氯化钙/乙醇水溶液中溶剂蒸发制备丝纤维蛋白的薄膜。介绍了醇处理对丝纤维蛋白基膜热，机械和光学性质的影响。为了了解醇处理的丝素蛋白膜的共形结构，采用IR光谱分解方法。尤其是醇处理的丝素蛋白膜的光学透明度，雾度和荧光发射的光学性质，并系统地与保形结构一起研究，以了解原纤维的作用，例如影响光学性质的β-薄片。一元醇处理在再生丝素蛋白结构中增加了β-转含量。这些影响了丝纤维蛋白薄膜内的光漫射量和散射量。通过醇处理，所有丝纤维素膜都表现出具有不同水平的光学雾度（2.56-14.17％）的特殊光学透明度（> 90％）。特别地，乙醇处理的丝纤维蛋白膜含有最高含量的β-转（22.8％）。乙醇处理的丝纤维蛋白膜显示出振荡波峰和槽中的透射型透射谱中的粗糙度的不同干涉，从而显示最低的光学雾度为2.56％。相反，用甲醇和丙醇处理的丝纤维素薄膜分别具有最高（14.17％）和第二最高（10.29％）光学透射率雾度。用甲醇处理的丝纤维蛋白薄膜的β转含量是最低（20.5％）。这些结果表明了β转含量与光学雾度特性之间的关系。结果表明，提供了一种制造具有可调节光扩散和散射的特殊光学透明丝纤维蛋白薄膜的方法，其可以设计成符合通过一元醇处理提供紫外线屏蔽保护的特定应用。

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