Abstract

Amorphous cellulose thin films with thicknesses of 8–100 nm and sub-nanometer roughness have been fabricated by spin-casting from molecular solutions of cellulose in mixtures of ionic liquids and organic solvents. Combining X-ray, optical and scanning probe measurements, cellulose films have been found to be fully amorphous, and their mass densities are comparable to that of the bulk amorphous cellulose. Full amorphization of cellulose films is achieved through sequential removal of solvents, successive diffusion of ionic liquid molecules out of cellulose films, and simultaneous formation of hydrogen bonding among cellulose chains.

Graphic abstract

中文翻译：

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非晶态纤维素薄膜

摘要

通过在离子液体和有机溶剂的混合物中，通过纤维素分子溶液的旋涂法制得了厚度为8–100 nm，亚纳米粗糙度的非晶态纤维素薄膜。结合X射线，光学和扫描探针测量，发现纤维素膜是完全无定形的，其质量密度与块状无定形纤维素相当。纤维素膜的完全非晶化是通过依次去除溶剂，离子液体分子从纤维素膜中连续扩散以及同时在纤维素链之间形成氢键来实现的。

图形摘要