Due to the nanoscale and the same chemical structure to cellulosic fibers, it is difficult to directly observe the distribution of CNFs in paper sheets. Herein, dye-labeled CNFs were introduced to analyze the distribution of CNFs in paper handsheets. The dye was successfully loaded on CNFs through hydrogen bonding with an environmentally friendly method. Dye-labeled CNFs were mixed with four types of pulps with different beating degrees to form paper handsheets. The results showed that with the beating degree increasing, the colorimetric values of wire side and felt side were different among the four types of paper, which indicated that distributions of CNFs in the Z-direction of papers were not uniform. The study demonstrated that the dye-labeled CNFs methods is an effective way to analyze the distribution of CNFs in paper-based materials.

中文翻译：

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纸质手抄纸中纤维素纳米原纤维的分布分析：染料标记方法。

由于纳米级和纤维素纤维具有相同的化学结构，因此很难直接观察到纸张中CNF的分布。本文中，引入了染料标记的CNF，以分析CNF在手抄纸中的分布。通过一种环境友好的方法通过氢键将染料成功地装载到CNF上。将染料标记的CNF与四种打浆度不同的纸浆混合以形成手抄纸。结果表明，随着打浆度的增加，四种类型的纸的线侧和毛毡侧的比色值不同，这表明CNF在纸的Z方向上的分布不均匀。研究表明，染料标记的CNFs方法是分析CNF在纸质材料中分布的有效方法。