Self-organizing capacity of nanocelluloses via droplet evaporation
Self-organizing capacity of nanocelluloses via droplet evaporation
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DOI：
10.1039/c3sm27822k
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发表时间：
2013-02
期刊：
影响因子：
3.4
通讯作者：
K. Uetani;H. Yano
中科院分区：
文献类型：
--
作者：
K. Uetani;H. Yano
通过比较棒状和半柔性纳米纤维素在2D(“咖啡环”)和3D(喷雾干燥微粒(MPS))中的蒸发诱导自组装(EISA)结果，研究了纤维形状与自组织能力的关系。通过喷雾干燥，棒状衣壳蛋白纳米晶须沿咖啡环周向排列，并形成向列环宽度为∼300 nm的弧形盘状微粒。另一方面，半柔性衣原蛋白纳米纤维未能通过EISA相变，形成喷雾干燥的MPS，具有多个尖锐的扭结和粗糙的轮廓。棒状纳米纤维素具有自组织相变和左旋手性的能力。通过表面张力测量发现，棒状粒子的自组织能力的表达与初始液滴的形状和大小无关。
The relation between the fibril shapes and the self-organizing capacity was investigated by comparing the results of evaporation-induced self-assembly (EISA) in 2D (“coffee rings”) and 3D (spray-dried microparticles (MPs)) for rod-like and semi-flexible nanocelluloses. The rod-like tunicin nanowhiskers formed nematic alignment along the perimeter of coffee rings, and also formed curved discotic microparticles having nematic rings of width ∼300 nm by spray drying. On the other hand, the semi-flexible tunicin nanofibers failed to undergo a phase transition by EISA, and formed spray-dried MPs with multiple sharp kinks and rough contours. The rod-like nanocelluloses exhibited the self-organizing capacity of the phase transition and left-handed chirality. The expression of the self-organizing capacity of rod-like particles was found to be independent of initial droplet shapes and sizes via surface tension measurements.