An Ultrastrong Nanofibrillar Biomaterial: The Strength of Single Cellulose Nanofibrils Revealed via Sonication-Induced Fragmentation

作者：Saito, Tsuguyuki; Kuramae, Ryota; Wohlert, Jakob; Berglund, Lars A.^*; Isogai, Akira

来源：Biomacromolecules, 2013, 14(1): 248-253.

DOI：10.1021/bm301674e

• ATOMIC-FORCE MICROSCOPY
• TRANSMISSION ELECTRON-MICROSCOPY
• TEMPO-OXIDIZED CELLULOSE
• ELASTIC-MODULUS
• CRYSTALLINE REGIONS
• CARBON NANOTUBES
• NATIVE CELLULOSE
• INDUCED SCISSION
• MECHANISM
• BACTERIAL

We report the mechanical strength of native cellulose nanofibrils. Native cellulose nanofibrils, purified from wood and sea tunicate, were fully dispersed in water via a topochemical modification of cellulose nanofibrils using 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) as a catalyst. The strength of individual nanofibrils was estimated based on a model for the sonication-induced fragmentation of filamentous nanostructures. The resulting strength parameters were then analyzed based on fracture statistics. The mean strength of the wood cellulose nanofibrils ranged from 1.6 to 3 GPa, depending on the method used to measure the nanofibril width. The highly crystalline, thick tunicate cellulose nanofibrils exhibited higher mean strength of 3-6 GPa. The strength values estimated for the cellulose nanofibrils in the present study are comparable with those of commercially available multiwalled carbon nanotubes.

• 出版日期2013-1