Fiber and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, FI-90014, Oulu, Finland.
Small. 2018 Sep;14(38):e1801937. doi: 10.1002/smll.201801937. Epub 2018 Aug 27.
In the present study, interfacial complexation spinning of oppositely charged cellulose-materials is applied to fabricate hierarchical and continuous nanocellulose based filaments under aqueous conditions by using cationic cellulose nanocrystals with different anionic celluloses including soluble sodium carboxymethyl cellulose and insoluble 2,2,6,6-tetramethylpiperidinyl-1-oxy radical-oxidized cellulose nanofibers and dicarboxylated cellulose nanocrystals (DC-CNC). The morphologies of the wet and dry nanocellulose based filaments are further investigated by optical and electron microscopy. All fabricated continuous nanocellulose based filaments display a hierarchical structure similar to the natural cellulose fibers in plant cells. As far as it is known, this is not only the first report about the fabrication of nanocellulose based filaments by interfacial complexation of cationic CNCs with anionic celluloses but also the first demonstration of fabricating continuous fibers directly from oppositely charged nanoparticles by interfacial nanoparticle complexation (INC). This INC approach may provide a new route to design continuous filaments from many other oppositely charged nanoparticles with tailored characteristics.
在本研究中，应用相反电荷的纤维素材料的界面络合纺丝，在水相条件下，通过使用带正电荷的纤维素纳米晶体与不同的阴离子纤维素（包括可溶性的羧甲基纤维素钠和不溶性的 2,2,6,6-四甲基哌啶-1-氧基自由基氧化纤维素纳米纤维和二羧基化纤维素纳米晶体（DC-CNC）），制备具有分级和连续纳米纤维素的纤维。通过光学显微镜和电子显微镜进一步研究了湿和干纳米纤维素纤维的形态。所有制备的连续纳米纤维素纤维都显示出类似于植物细胞中天然纤维素纤维的分级结构。据所知，这不仅是首次报道通过带正电荷的 CNCs 与阴离子纤维素的界面络合来制备纳米纤维素纤维，也是首次通过界面纳米粒子络合（INC）直接从带相反电荷的纳米粒子制备连续纤维的报道。这种 INC 方法可能为通过界面纳米粒子络合从许多具有特定特性的带相反电荷的纳米粒子设计连续纤维提供了一条新途径。
