| 초록 |
This study introduces a new colorimetric display technology in which cellulose nanoscrystals (CNCs) self-assemble in suspension to form iridescent chiral nematic films. Utilization of CNCs is truly intriguing since they reflect circularly polarized light at specific wavelengths in the dried film state. The chiral nematic pitch is tunable depending on how much external energy is applied during the suspension procedure, i.e., ultrasound. The reflection wavelength is electrostatic in nature, thus meaning that the electrostatic repulsion between CNCs is essential for regulation of reflection wavelength. In order to exactly figure out the underlying mechanism, we controlled the surface charge density of CNCs by using 2,2,6,6-tetramethylpiperidine-1-oxyl radical mediated oxidation and demonstrated how the electrostatic repulsion between CNCs could span the reflecton wavelength in the film. |
