Abstract
AbstractA 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.
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