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Self-organization in the chitosan-clay nanoparticles system regulated through polysaccharide macromolecule charging. 1. Hydrogels |
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| Authors: | Yu. A. Shchipunov V. E. Silant’ev I. V. Postnova |
| Affiliation: | 1. Institute of Chemistry, Far East Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia 2. WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Division of Chemical Engineering, Pusan National University, San 30, Jangjun Dong, Geumjung Gu, Busan, South Korea 3. Far East Federal University, ul. Oktyabr??skaya 27, Vladivostok, 690950, Russia |
| Abstract: | Scanning and transmission electron microscopy and dynamic rheology are used to thoroughly characterize the morphology and mechanical properties of bionanocomposite hydrogel prepared by mixing cationic chitosan with negatively charged particles of a synthetic clay (saponite) followed by gradual increasing of the charge of chitosan macromolecules by decreasing the pH of a medium. Gelation of the system is found to be due to the formation of a fibrillar three-dimensional network structure. It is shown that the size fibrils, the density of the network structure, and its mechanical properties are determined by the concentration ratio between the polysaccharide and saponite particles. |
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