Abstract:

The supramolecular structure diversity of gel soft matter system was analyzed by TEMPO-mediated oxidation method, TEMPO-oxidized bacterial cellulose nanocomposite gel was used as the experimental sample. The analysis results of supramolecular structure diversity were obtained by FT-IR, SEM, XRD, TEM and Raman spectroscopy. The results showed that, there were great differences in FT-IR stretching vibration peaks, X-ray diffraction peaks and Raman vibration peaks between different types of gel. Under the influences of additives, light conditions and other interference factors, the supramolecular structure showed by SEM images changed significantly. When the cellulose content in the gel was 10%, the molecules in the structure piled up with each other, indicative of an obvious uneven dispersion, while the pore distribution distance in the gel was kept at several nanometers. TEM images also showed that the supramolecular structures of gel with different cellulose content were inconsistent. With the increase of calcination temperature, the number of vibration peaks in the Raman spectrum of gel was continuously increased, indicative of the change in supramolecular structure, which could reflect the diversity of supramolecular structure.

Key words: nanocomposite gel, supramolecular structure, diversity, self-assembly, TEMPO oxidation, bacterial cellulose