Cellulose nanocrystals (CNCs) per their twisting structure and high aspect ratio and charged surface property are increasingly receiving great attention in chiral photonic crystal and pigment fabrication. However, the cholesteric mesophases of CNCs is unstable and easily destroyed by the additives with high Mw. In this work, hydroxypropyl cellulose (HPC) and carboxymethyl cellulose (CMC) are incorporated into CNCs for a continuous mesophase transition monitoring. We investigated the effects of HPC and CMC on the properties of CNCs with respect to the morphology, mesophase, rheology, and structure-color properties. Our results showed that the addition of CMC (≥ 1 wt%) prevented the formation of a continuous cholesteric phase but resulting in a fast gelation due to the strong repulsion between CMC and CNCs. Alternatively, the cholesteric phase was well-preserved in the CNC/HPC in which HPC (< 10 wt%) served as an efficient tuner of phase transition, color hue and rheology properties.

中文翻译：

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通过掺入两种纤维素衍生物引起的纤维素纳米晶体的中间相转变。

纤维素纳米晶体（CNCs）的扭曲结构，高长宽比和带电表面特性在手性光子晶体和颜料制造中越来越受到关注。但是，氯化萘的胆甾型中间相是不稳定的，并且容易被高分子量的添加剂破坏。在这项工作中，将羟丙基纤维素（HPC）和羧甲基纤维素（CMC）合并到CNC中，以进行连续的中间相转变监控。我们研究了HPC和CMC对CNC的形态，中间相，流变学和结构颜色性质的影响。我们的结果表明，添加CMC（≥1 wt％）可以防止形成连续的胆甾相，但是由于CMC和CNC之间的强烈排斥，导致了快速凝胶化。或者，