Journal
CARBOHYDRATE POLYMERS
Volume 277, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118829
Keywords
Cellulose nanocrystal; Manganese ion; Iridescent film; Chiral nematic organization; Functional material
Categories
Funding
- National Natural Science Foundation of China [51573082, 21774068]
- State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao University) [K2019-09]
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The co-assembly of metal ions and cellulose nanocrystals offers a promising strategy to fabricate novel iridescent materials with advanced applications. A facile and rapid method combining ultrasonication pretreatment and vacuum-assisted self-assembly technique is proposed to prepare manganese-doped carboxylated CNC iridescent films, which exhibit rapid and visible color change in ammonia atmosphere and efficient removal of methylene blue dye in aqueous solution.
Co-assembly of metal ion and cellulose nanocrystals (CNC) is a promising strategy to fabricate novel iridescent CNC materials with advanced applications. By combining ultrasonication pretreatment and vacuum-assisted self assembly (VASA) technique, a facile and rapid strategy is proposed to prepare the Mn2+-doped carboxylated CNC (C-CNC) iridescent films with multifunctional application. The ultrasonication pretreatment temporarily disassembles the aggregates of C-CNC nanorods caused by the electrostatic interaction between negative charged CCNC and Mn2+. The subsequent VASA process accelerates the self-assembly of chiral liquid crystals prior to the re-agglomeration of C-CNC by the bridge effect of Mn2+. Furthermore, the as-prepared Mn2+/CNC film exhibits a rapid and visible color change in ammonia atmosphere along with the formation of MnO2. The reversible change can be realized by the stimulation of reducing agent. The derived MnO2/C-CNC composite film displays efficient removal of methylene blue dye in aqueous solution by both of adsorption and degradation procedure.
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