Nanofibrillation of Wood Pulp Using a High-Speed Blender
Nanofibrillation of Wood Pulp Using a High-Speed Blender
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DOI：
10.1021/bm101103p
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发表时间：
2011-02-01
影响因子：
6.2
通讯作者：
Yano, Hiroyuki
中科院分区：
文献类型：
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作者：
Uetani, Kojiro;Yano, Hiroyuki
我们报告了高速混合机在纳米原纤化未干燥纸浆中的成功应用，将其制成直径均匀为 15-20 nm 的纤维素纳米纤维 (CNF)。与在研磨机中处理的纸浆相比，在搅拌机中处理 30 分钟的纸浆显示出相同程度的原纤化，但对 CNF 的损害较小。观察纳米原纤化过程表明，稻草状纸浆以一种非常特有的方式原纤化，形成许多“气球状结构”。当气球延伸到边缘时，原纤维迅速个体化。然而，细胞壁撕裂的纸浆碎片被分裂成更细的碎片，并逐渐分解成纳米纤维。在处理过程中改变搅拌速度和纸浆浓度表明，在37000rpm下0.7wt％的纸浆浓度是该混合方法中的最佳原纤化条件。通过在各种氯化钠溶液中的处理，从胶体表面物理的角度研究了CNF表面电荷对纤维化的影响。研究发现，CNF 表面双电层产生的排斥力可能在纤维颤动的发生中起关键作用。
We report the successful use of a high-speed blender in nanofibrillating never-dried pulp to cellulose nanofibers (CNFs) with a uniform diameter of 15-20 nm. Pulp treated for 30 min in a blender showed the same degree of fibrillation with less damage to the CNF compared with that treated in a grinder. Observing the process of nanofibrillation clarified that the straw-like pulp was fibrillated in a very characteristic way, by forming many "balloon-like structures". As the balloons extended to the edges, the fibrils were rapidly individualized. However, the pulp fragments with ripped cell walls were split into finer fragments and gradually disintegrated into nanofibers. Changing the agitation speed and pulp concentration during the treatment revealed that the pulp concentration of 0.7 wt % at 37 000 rpm was the optimum fibrillation condition in this blender method. Through treatments in various NaCl solutions, the effect of the surface charge of CNF on the fibrillation was studied from the viewpoint of colloidal surface physics. It was found that repulsion due to the electric double layer of the CNF surface may play a critical role in the occurrence of fibrillation.