The aim of this study is to clarify light scattering mechanism of hazy transparent cellulose nanopaper. Clear optical transparent nanopaper consists of 3-15 nm wide cellulose nanofibers, which are obtained by the full nanofibrillation of pulp fibers. At the clear transparent nanopaper with 40 μm thickness, their total transmittance are 89.3-91.5% and haze values are 4.9-11.7%. When the pulp fibers are subjected to weak nanofibrillation, hazy transparent nanopapers are obtained. The hazy transparent nanopaper consists of cellulose nanofibers and some microsized cellulose fibers. At the hazy transparent nanopaper with 40 μm thickness, their total transmittance were constant at 88.6-92.1% but their haze value were 27.3-86.7%. Cellulose nanofibers are solid cylinders, whereas the pulp fibers are hollow cylinders. The hollow shape is retained in the microsized cellulose fibers, but they are compressed flat inside the nanopaper. This compressed cavity causes light scattering by the refractive index difference between air and cellulose. As a result, the nanopaper shows a hazy transparent appearance and exhibits a high thermal durability (295-305 °C), and low thermal expansion (8.5-10.6 ppm/K) because of their high density (1.29-1.55 g/cm³) and crystallinity (73-80%).

中文翻译：

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朦胧透明纤维素纳米纸。

这项研究的目的是阐明朦胧透明纤维素纳米纸的光散射机理。透明的光学透明纳米纸由3-15 nm宽的纤维素纳米纤维组成，这些纤维素纳米纤维是通过纸浆纤维的完全纳米原纤化而获得的。在厚度为40μm的透明透明纳米纸上，其总透射率为89.3-91.5％，雾度值为4.9-11.7％。当纸浆纤维经受弱的纳米原纤化时，获得朦胧的透明纳米纸。朦胧透明的纳米纸由纤维素纳米纤维和一些超细纤维素纤维组成。在厚度为40μm的朦胧透明纳米纸上，它们的总透射率恒定在88.6-92.1％，但是其雾度值为27.3-86.7％。纤维素纳米纤维是实心圆柱，而纸浆纤维是空心圆柱。中空形状保留在超细纤维素纤维中，但它们在纳米纸内部被压扁。该压缩腔通过空气和纤维素之间的折射率差引起光散射。结果，由于纳米纸的高密度（1.29-1.55 g / cm），其显示出朦胧的透明外观并显示出高的热耐久性（295-305°C）和低的热膨胀（8.5-10.6 ppm / K）。³）和结晶度（73-80％）。