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Cellulose

pp 1–16 | Cite as

Structural variations of cotton cellulose nanocrystals from deep eutectic solvent treatment: micro and nano scale

  • Zhe Ling
  • J. Vincent Edwards
  • Zongwei Guo
  • Nicolette T. Prevost
  • Sunghyun Nam
  • Qinglin Wu
  • Alfred D. French
  • Feng Xu
Original Paper
  • 20 Downloads

Abstract

Solvents that produce cellulose nanocrystals (CNCs) and promote cellulose fibrillation are of current interest. In this work, CNCs were fabricated from cotton at 80 and 100 °C using deep eutectic solvents (DESs) having choline chloride/oxalic acid dihydrate (OA) ratios of 1:1, 1:2 and 1:3. To investigate the side effects of the fabrication, the crystal structure and morphology of micro-sized treated cellulose together with nano-sized CNCs were analyzed by X-ray diffraction, field emission scanning electron microscopy and atomic force microscopy. OA promoted the formation of carboxyl groups on the C6 positions of molecules on the hydrophilic (1–10) lattice planes, causing extensive fibrillation of cellulose and disruption of surface layers on (110) and (200) planes. Lower crystallinity and lamellar structures for CNCs with mild treatment were observed after mechanical disintegration and subsequent lyophilization, which was ascribed to van der Waals forces and hydrogen bonding between adjacent crystalline cellulose chains, accelerating the self-assembly into cellulose macrofibrils. This work is discussed in light of cellulose supramolecular structures that are modified from CNC fabrication via DES treatment, with a view to enhancing the efficacy of treatment by understanding the variations that arise in cellulose structure from a green solvent.

Graphical abstract

Keywords

Cotton Cellulose nanocrystals Deep eutectic solvent Crystal structure 

Notes

Acknowledgments

The authors gratefully acknowledge financial support by National Key Research and Development Program of China (2017YFD0601004) and Chinese Scholarship Council (CSC No. 201706510045). We also appreciate Dr. Mohammad Saghayezhian of LSU Shared Instrument Facility for technical assistance with the XRD experiments.

Supplementary material

10570_2018_2092_MOESM1_ESM.docx (973 kb)
Supplementary material 1 (DOCX 972 kb)

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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply  2018

Authors and Affiliations

  1. 1.Beijing Key Laboratory of Lignocellulosic ChemistryBeijing Forestry UniversityBeijingChina
  2. 2.Southern Regional Research Center, Agricultural Research Service, USDANew OrleansUSA
  3. 3.School of Renewable Natural ResourcesLouisiana State University Agricultural CenterBaton RougeUSA

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