Alternating Stacking of Nanocrystals and Nanofibers into Ultrastrong Chiral Biocomposite Laminates.,ACS Nano

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Alternating Stacking of Nanocrystals and Nanofibers into Ultrastrong Chiral Biocomposite Laminates.
ACS Nano ( IF 15.8 ) Pub Date : 2020-09-10 , DOI: 10.1021/acsnano.0c06192
Xiaofang Zhang _{1,

2} , Rui Xiong ₁ , Saewon Kang ₁ , Yingkui Yang ₂ , Vladimir V Tsukruk ₁

Affiliation

Attaining high mechanical strength and flexibility for chiral nematic biopolymer composites without compromising their vivid optical iridescence is an intriguing but challenging task. Traditional cellulose nanocrystal (CNC) blend nanocomposite films typically lose their coloration and display weak mechanical performance due to poor load transfer between needle-like nanocrystals and the collapse of a twisted organization. Herein, we report a design of robust laminated biocomposites with an alternatively stacked chiral nematic CNC phase and a random cellulose nanofiber (CNF) phase via a hydrogen-bonding-assisted layer-by-layer method. In contrast to the traditional biopolymer blends, the alternating CNC–CNF stacked films possess many-fold enhancement in both mechanical strength and toughness with their vivid structural colors highly preserved. We suggest that the enriched hydrogen bonding and partial limited entanglements at the interfaces between the helicoidal and random phases are responsible for enhancing the mechanical performance of robust biocomposites with brilliant iridescent colors. Such organized cellulose–cellulose biocomposites with alternating helicoidal–random phases fabricated by a facile sequential strategy may facilitate the development of sustainably sourced, damage-tolerant, and photonic films for bioenabled display technologies, security indicators, soft robotics, camouflages, and pressure sensors.

中文翻译：

将纳米晶体和纳米纤维交替堆叠成超强手性生物复合层压板。

在不损害其生动的光学虹彩的情况下，获得手性向列型生物聚合物复合材料的高机械强度和柔韧性是一项引人入胜但具有挑战性的任务。传统的纤维素纳米晶体（CNC）共混纳米复合材料薄膜通常会失去其色泽并显示出较弱的机械性能，这是由于针状纳米晶体之间的载荷传递不佳以及扭曲的组织塌陷所致。此，我们报告稳健层压生物复合材料的设计具有交替层叠的手性向列相CNC和随机纤维素纳米纤维（CNF）相通过氢键辅助的逐层法。与传统的生物聚合物共混物相比，交替的CNC-CNF叠层膜在机械强度和韧性方面均具有许多倍的提高，并保留了鲜明的结构颜色。我们建议，在螺旋相和随机相之间的界面处富集的氢键和部分有限的缠结负责增强具有鲜艳虹彩颜色的坚固生物复合材料的机械性能。这种通过有序的顺序策略制造的具有交替的螺旋-随机相的有组织的纤维素-纤维素生物复合材料，可能有助于开发可生物来源的显示技术，安全性指示器，软机器人，伪装和压力传感器的可持续来源，耐损伤和光子薄膜。

更新日期：2020-09-10

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