Stress-relaxation behavior of a physical gel: Evidence of co-occurrence of structural relaxation and water diffusion in ionic alginate gels |
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| Authors: | Giancarmine Gentile Francesco Greco Domenico Larobina |
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| Affiliation: | 1. Institute of Composite and Biomedical Materials – National Research Council of Italy, CNR – P.le E. Fermi 1, 80055 Portici, Naples, Italy;2. National Institute of Material Science and Technology INSTM UdR of Naples, Italy;3. Institute for Research on Combustion – National Research Council of Italy, CNR – P.le V. Tecchio 80, 80125 Naples, Italy |
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| Abstract: | Stress relaxation measurements on ionically cross-linked alginate gels in an unconfined uniaxial compression are reported. Data are obtained as a function of ionic (divalent calcium) concentration and for various sample radii. Analysis of the results shows that such gels, at all investigated concentrations, relax the stress by two different concurring mechanisms: (a) an internal relaxation, most probably due to detachment and re-bonding of the cations along the alginate chains, and (b) the diffusion of water out of the gel. |
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| Keywords: | Alginate gels Unconfined compression Stress relaxation Water diffusion Structural relaxation |
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