Travelling colourful patterns in self-organized cellulose-based liquid crystalline structures
Travelling colourful patterns in self-organized cellulose-based liquid crystalline structures
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DOI：
10.1038/s43246-021-00182-7
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发表时间：
2021-07-20
影响因子：
7.8
通讯作者：
Godinho, Maria Helena
中科院分区：
文献类型：
--
作者：
Silva, Pedro E. S.;Chagas, Ricardo;Godinho, Maria Helena
基于纤维素的系统可用于许多应用。然而，在非平衡条件下的自组织问题，这是普遍存在于生活中的物质，几乎没有在纤维素基材料的解决。在这里，我们表明，准2D制剂的溶致纤维素为基础的中间相显示旅行彩色图案，这是由化学反应-扩散机制与溶剂在边界处的蒸发同时产生的。这些图案涉及螺旋螺距的振幅和符号的空间和时间变化。我们提出了一个简单的模型，反应扩散机制的基础上，模拟所观察到的时空颜色行为。纤维素是一种天然存在的体系，具有手性大分子结构。在这里，丰富多彩的结构模式中观察到的纤维素为基础的溶致异构体系统，归因于构象的自我调整的纤维素链的环境。
Cellulose-based systems are useful for many applications. However, the issue of self-organization under non-equilibrium conditions, which is ubiquitous in living matter, has scarcely been addressed in cellulose-based materials. Here, we show that quasi-2D preparations of a lyotropic cellulose-based cholesteric mesophase display travelling colourful patterns, which are generated by a chemical reaction-diffusion mechanism being simultaneous with the evaporation of solvents at the boundaries. These patterns involve spatial and temporal variation in the amplitude and sign of the helixs pitch. We propose a simple model, based on a reaction-diffusion mechanism, which simulates the observed spatiotemporal colour behaviour. Cellulose is a naturally occurring system of interest for its chiral macromolecular structure. Here, colourful structural patterns are observed in a cellulose-based lyotropic cholesteric system, attributed to conformational self-adjustment of the cellulose chain to its environment.