| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Local Modulation of Cholesteric Cellulose Nanocrystals Based on Magnetic Field-Vacuum Synergistic Effect |
| YU Jiaming1,2, WANG Shipeng1, DONG Yahui1, WANG Yumeng1, LI Yu3, CHENG Qian1
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1 College of Materials Science and Engineering, Northeast Forestry University, Harbin 150000, China
2 School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150000, China
3 College of Science, Northeast Forestry University, Harbin 150000, China |
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Abstract In this work, the suspension of rod-like cellulose nanocrystals were prepared by sulfuric acid hydrolysis method using cotton as raw material, and the cholesteric cellulose chiral film was formed via evaporation-induced self-assembly (EISA) process. Furthermore, the effects of external enviroment, such as vacuum degree and magnetic field, on the structure and performance of cholesteric cellulose chiral film during EISA process were investigated systematically. The results show that the particle size of crystalline nanocellulose prepared by sulfuric acid hydrolysis is 161.6 nm; the vacuum degree has a significant effect on the pitch of cholesteric cellulose, and with the vacuum degree increasing, the pitch of the obtained cholesteric cellulose increases and the wavelength of reflected light generated bathochromic shift. Moreover, it is found that the greater degree of vacuum is, the more significant the effect of the magnetic field on the pitch adjustment of cholesteric cellulose is, by applying a magnetic field and changing the vacuum environment during the evaporation process. Thus, the structural color of cholesteric cellulose membranes can be modulated by regulating the cholesteric helical pitch of the affected region through the synergy of magnetic field and vacuum.
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Published:
Online: 2022-06-09
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| Fund:Fundamental Research Funds for the Central Universities (2572019BB06) and Heilongjiang Provincial Natural Science Foundation of China(HL2019E002). |
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2022, Vol. 36 
