Unwinding a spiral of cellulose nanocrystals for stimuli-responsive stretchable optics
Unwinding a spiral of cellulose nanocrystals for stimuli-responsive stretchable optics
复制标题
DOI：
10.1038/s41467-019-08351-6
复制
发表时间：
2019-01-31
影响因子：
16.6
通讯作者：
MacLachlan, Mark J.
中科院分区：
文献类型：
--
作者：
Kose, Osamu;Tran, Andy;MacLachlan, Mark J.
纤维素纳米晶体（CNCs）来源于生物质自发组织成螺旋排列，称为手性螺旋结构。这种结构模仿了节肢动物外骨骼中发现的几丁质组织，它有助于其显着的机械强度。在这里，我们展示了一种光子传感机制的基础上可逆解旋的手性cncnc嵌入在弹性体，导致材料显示刺激响应可拉伸光学。当薄膜拉伸时，会出现鲜艳的干涉色，当弹性体恢复到原始形状时，干涉色就会消失。这种可逆的光学效应是由机械诱导的手性手性和伪手性排列之间的CNCs的过渡引起的。
Cellulose nanocrystals (CNCs) derived from biomass spontaneously organize into a helical arrangement, termed a chiral nematic structure. This structure mimics the organization of chitin found in the exoskeletons of arthropods, where it contributes to their remarkable mechanical strength. Here, we demonstrate a photonic sensory mechanism based on the reversible unwinding of chiral nematic CNCs embedded in an elastomer, leading the materials to display stimuli-responsive stretchable optics. Vivid interference colors appear as the film is stretched and disappear when the elastomer returns to its original shape. This reversible optical effect is caused by a mechanically-induced transition of the CNCs between a chiral nematic and pseudo-nematic arrangement.