期刊
CELLULOSE
卷 19, 期 5, 页码 1599-1605出版社
SPRINGER
DOI: 10.1007/s10570-012-9733-1
关键词
Cellulose nanocrystals; Electron microscope images; Chiral nematic films; Lefthanded helicoidal structures; Film cross-sections; Fracture surface
资金
- Finnish Funding Agency for Technology and Innovation (TEKES)
- Academy of Finland, Finnish Center of Nanocellulose
- Aalto University
- UPM
- VTT
- NSERC Canada
- Centre for Self-assembled Chemical Structures
The chiral nematic self-assembly of aqueous suspensions of cellulose nanocrystals is partially preserved on evaporation of water, but the ordering of the rod-like nanoparticles may become distorted by changes in volume, ionic strength and surface and convective forces during evaporation, thus affecting the morphology and optical properties of the dried film. Proposed applications for these solids with chiral nematic order require confirmation of their structure. A SEM examination of the fracture surface of a slowly-dried film showed a surprisingly regular fan-like pattern which is shown to be characteristic of cross-sections of the left-handed helicoidal arrangement of nanocrystals, where the helicoidal axis was almost perpendicular to the film surfaces. Superimposed on this pattern was what appeared to be a regular porosity, which is postulated to result from pull-out of the nanocrystals oriented orthogonal to the fracture surface.
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