| 초록 |
This study introduces a straightforward approach to fabricate bacterial cellulose nanofibrils (BCNFs), which have significant potential for rheology modification of complex fluids. For this, we first conducted 2,2,6,6-tetramethylpiperidine-1-oxyl radical mediated oxidation to BCNFs in the aqueous media. Then, we controlled the aspect ratio of BCNFs through mechanical fibrillation process. Tuning of the electrostatic interaction of BCNFs at various pH conditions allowed us to obtain a nanofibrillar crystalline gel phase. Furthermore, the BCNF gel network displayed reversible shear thinning in response to the applied shear stress. From suspension rheological studies, finally, we demonstrated that the BCNFs with controlled aspect ratio of fibrils exhibited strong viscosity enhancement as well as shear stress-responsive reversible sol-gel transition. |
