1. Ultrasonication pretreatment assisted rapid co-assembly of cellulose nanocrystal and metal ion for multifunctional application
- Author
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Yuan Yuan, Min Jiang, Na Li, Jianming Zhang, Lu Zong, Hongsheng Yang, and Jinli Qin
- Subjects
Materials science ,Aqueous solution ,Polymers and Plastics ,Reducing agent ,Sonication ,Organic Chemistry ,chemistry.chemical_compound ,Adsorption ,Nanocrystal ,chemistry ,Chemical engineering ,Materials Chemistry ,Nanorod ,Cellulose ,Methylene blue - Abstract
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 C-CNC 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.
- Published
- 2022
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