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Hierarchical cross-linking in physical alginate gels: a rheological and dynamic light scattering investigation | | Domenico Larobina
; Luca Cipelletti
; | | Date: |
24 Sep 2013 | | Abstract: | We investigate the dynamics of alginate gels, an important class of
biopolymer-based viscoelastic materials, by combining mechanical tests and
non-conventional, time-resolved light scattering methods. Two relaxation modes
are observed upon applying a compressive or shear stress. Dynamic light
scattering and diffusive wave spectroscopy measurements reveal that these modes
are associated with discontinuous rearrangement events that restructure the gel
network via anomalous, non-diffusive microscopic dynamics. We show that these
dynamics are due to both thermal activation and internal stress stored during
gelation and propose a scenario where a hierarchy of cross-links with different
life times is responsible for the observed complex behavior. Measurements at
various temperatures and sample ages are presented to support this scenario. | | Source: | arXiv, 1309.6349 | | Services: | Forum | Review | PDF | Favorites | |
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