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2.4. Swelling characterization of hydrogels
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The as-prepared hydrogels were immersed in phosphate-buffered saline (PBS) until a swelling equilibrium was attained. The swelling ratio of the gels was calculated from the following equation:
where Ws is the mass of swollen hydrogel and Wd is the mass of dried hydrogel.
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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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