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Ensemble evaluation of polydisperse nanocellulose dimensions: rheology, electron microscopy, X-ray scattering and turbidimetry
- Tanaka, Reina, Kuribayashi, Tomoko, Ogawa, Yu, Saito, Tsuguyuki, Isogai, Akira, Nishiyama, Yoshiharu
- Cellulose 2017 v.24 no.8 pp. 3231-3242
- X-radiation, acid hydrolysis, cellulose, dispersions, electron microscopy, rheology, sulfuric acid, turbidimetry, viscosity
- Six types of CNCs with different sizes were prepared from tunicins by sulfuric acid hydrolysis and subsequent sonication in water. The size distributions of CNCs were comprehensively evaluated by turbidimetry, small angle X-ray scattering, and microscopy to predict their intrinsic viscosities. Experimental intrinsic viscosities [η] of the CNC dispersions were evaluated by shear viscosity measurement, and then compared with their theoretical [η] values based on theories for rotational motions of rigid rods. The experimental [η] values for the straight CNCs were in good agreement with their theoretical [η] values, irrespective of the size and distributions. On the other hand, the experimental [η] value of the kinked CNC was higher than the theoretical [η] value, in agreement with a theoretical calculation giving higher intrinsic viscosities for bent fibers.