||Systematic dynamic viscoelasticity measurements for chitin nanofibers prepared with various concentrations, disintegration times, acidities, and crystalline structures
Suenaga, ShinOsada, Mitsumasa
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
437 , 2018-08 , ELSEVIER SCIENCE BV
Epub 2018 Apr 16
Dynamic viscoelasticities were measured for chitin nanofiber (ChNF) dispersions prepared with various concentrations, disintegration times, acidities, and crystalline structures. The 0.05 w/v% dispersions of pH neutral ChNFs continuously exhibited elastic behavior. The 0.05 w/v% dispersions of acidified ChNFs, on the other hand, transitioned from a colloidal dispersion to a critical gel and then exhibited elastic behavior with increasing ChNF concentration. A double-logarithmic chart of the concentration vs. the storage modulus was prepared and indicated the fractal dimension and the nanostructure in the dispersion. The results determined that the neutral alpha- and beta-ChNFs were dispersed but showed some remaining aggregations and that the acidified beta-ChNFs were completely individualized. In addition, the alpha-chitin steadily disintegrated with increasing disintegration time, and the aspect ratio of the beta-chitin decreased as a result of the exscessive disintegration. The storage moduli of the ChNFs were greater than those of chitin solutions, nanorods, and nanowhiskers with the same solids concentrations.