A cellulose acetate (CA) polymer monolith is conveniently fabricated using the thermally induced phase separation method. When a CA monolith in sheet form is immersed in a non‐solvent mixture with a suitable refractive index, transparent coloration due to the Christiansen effect is observed. This colorization is arbitrarily controlled by temperature and the non‐solvent composition. The wavelength of maximum transmission of the immersed monolith spectrum increases—with high sensitivity—at high temperatures and in non‐solvent with a low refractive index, while being independent of the monolith morphology. Following the alkali hydrolysis of the CA monolith, the transmission spectrum of regenerated cellulose monolith immersed in mixed non‐solvent clearly shifts by the Christiansen effect, whereas natural cellulose fibrils (wood cellulose and bacterial cellulose) with high crystallinity in the same non‐solvent are opaque or shows no Christiansen effect, respectively. The results indicate the potential of the amorphous cellulose monolith for use as a chemosensor.

中文翻译：

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基于克里斯汀森效应的纤维素整体材料的物理着色，使用热诱导相分离可方便地制备

可以使用热诱导相分离法方便地制造醋酸纤维素（CA）聚合物整料。将片状CA整料浸入具有合适折射率的非溶剂混合物中时，会观察到克里斯蒂安森效应引起的透明着色。此着色可通过温度和非溶剂成分任意控制。在高温下和在低折射率非溶剂中，浸没式单块光谱的最大透射波长以较高的灵敏度增加，而与单块的形态无关。在CA整体柱进行碱水解之后，浸泡在混合非溶剂中的再生纤维素整体柱的透射光谱会由于克里斯蒂安森效应而明显转移，在相同的非溶剂中具有高结晶度的天然纤维素原纤维（木材纤维素和细菌纤维素）分别是不透明的或没有克里斯蒂安效应。结果表明无定形纤维素整料用作化学传感器的潜力。