Controllable exfoliation of natural silk fibers into nanofibrils by protein denaturant deep eutectic solvent: nanofibrous strategy for multifunctional membranes,Green Chemistry

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Controllable exfoliation of natural silk fibers into nanofibrils by protein denaturant deep eutectic solvent: nanofibrous strategy for multifunctional membranes
Green Chemistry ( IF 9.3 ) Pub Date : 2018-07-02 , DOI: 10.1039/c8gc01609g
Xingxing Tan _{1,

2,

3,

4} , Wancheng Zhao _{1,

2,

3,

4} , Tiancheng Mu _{1,

2,

3,

4}

Affiliation

Nanofibrils derived from diverse natural polymers have received extensive interest. However, the direct extraction of silk nanofibrils (SNFs), particularly individual nanofibrils, to preserve nanofibrous structures remains challenging due to the sophisticated hierarchical structure and high crystallinity of silk. Here, we report a facile, high-efficiency, and scalable liquid exfoliation method to directly extract SNFs with controllable diameters from ≈20 nm (individual SNFs) to 100 nm and contour lengths of 0.3–10 μm from silk fibers using protein denaturant deep eutectic solvent (PD-DES) urea/guanidine hydrochloride. Because the important fibrillar structure of natural silks was preserved, free-standing SNF membranes fabricated by using the vacuum filtration of SNF dispersions exhibited nanoporous structure, solvent insolubility, excellent mechanical properties, and thermal stability. An activated carbon-based solid-state supercapacitor fabricated with 18 μm-thick SNF membrane as a separator exhibited a high capacitance value of 171 F g⁻¹ at 1 A g⁻¹ with 86% capacitance retention as the current density increases to 10 A g⁻¹. Moreover, SNF membranes showed size selectivity and adsorption performance for ions, dyes, and protein molecules when used as protein-based filtration membranes. SNF membranes with a unique structural features and reinforced properties have potential applications in energy storage devices and environmental engineering.

中文翻译：

蛋白质变性深共熔溶剂可控地将天然丝纤维剥落成纳米纤维：多功能膜的纳米纤维策略

衍生自多种天然聚合物的纳米原纤维受到了广泛的关注。然而，由于丝绸的复杂的分级结构和高结晶度，直接提取丝绸纳米原纤维（SNF），特别是单个纳米原纤维来保存纳米纤维结构仍然具有挑战性。在这里，我们报告了一种简便，高效且可扩展的液体剥落方法，可使用蛋白质变性深共晶直接从蚕丝纤维中提取直径从≈20nm（单个SNF）到100 nm的可控制直径，轮廓长度为0.3–10μm的SNF。溶剂（PD-DES）尿素/胍盐酸盐。由于保留了天然丝的重要原纤维结构，因此使用真空过滤SNF分散体制备的自立式SNF膜具有纳米孔结构，溶剂不溶性，优异的机械性能和热稳定性。以18μm厚的SNF膜作为隔膜制造的活性炭基固态超级电容器表现出171 F g的高电容值^-1 1 A G^-1与86％的电容保持为电流密度增加到10 A G^-1。此外，SNF膜用作基于蛋白质的过滤膜时，对离子，染料和蛋白质分子表现出尺寸选择性和吸附性能。具有独特结构特征和增强性能的SNF膜在储能设备和环境工程中具有潜在的应用。

更新日期：2018-07-30

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