期刊
CELLULOSE
卷 28, 期 1, 页码 19-29出版社
SPRINGER
DOI: 10.1007/s10570-020-03517-8
关键词
Cellulose nanofibrils; Swelling; AFM
资金
- NTNU Norwegian University of Science and Technology (St. Olavs Hospital - Trondheim University Hospital)
Research showed that the swellability of cellulose nanofibrils depends on their degree of crystallinity rather than the diameter. Samples with higher crystallinity had a smaller diameter increase upon introduction of de-ionized water, while samples with lower crystallinity had a larger diameter increase.
Atomic force microscopy (AFM) can be used to quantitatively study nanomaterials in different media, e.g. vacuum, air, or submerged in a liquid. A technique was developed to study swelling of individual cellulose nanofibrils (CNFs) using AFM. As a case study, CNFs with different degrees of crystallinity (DoC) were examined for swellability going from dry to wet (submerged in de-ionized water). Swelling was found to depend on DoC, but no significant correlation between fibril diameter and swellability was seen. Upon introduction of de-ionized water high DoC samples (65 +/- 2%) were found to have a diameter increase of 34% on average, whereas low DoC (44 +/- 2%) were found to have a diameter increase of 44% on average. A tested control, consisting of platinum nanowires on silisium, did not swell. [GRAPHICS] .
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