AI Article Synopsis
- The viscoelastic properties of hydrogels are crucial for their use in various scientific and industrial applications, but assessing these properties can be challenging due to their complex behaviors.
- Resonant acoustic rheometry (RAR) is a new, non-contact technique that measures resonant surface waves in materials, allowing for high temporal resolution during processes like fibrin gelation and PEG polymerization.
- RAR successfully captures the dynamic changes in frequency and amplitude of surface waves, revealing important transitions in the materials that reflect the interplay of surface tension, viscosity, and elasticity during hydrogel formation, thus providing an improved method for characterizing soft materials.
Article Abstract
Viscoelastic properties of hydrogels are important for their application in science and industry. However, rheological assessment of soft hydrogel biomaterials is challenging due to their complex, rapid, and often time-dependent behaviors. Resonant acoustic rheometry (RAR) is a newly developed technique capable of inducing and measuring resonant surface waves in samples in a non-contact fashion. By applying RAR at high temporal resolution during thrombin-induced fibrin gelation and ultraviolet-initiated polyethylene glycol (PEG) polymerization, we observed distinct changes in both frequency and amplitude of the resonant surface waves as the materials changed over time. RAR detected a series of capillary-elastic, capillary-viscous, and visco-elastic transitions that are uniquely manifested as crossover of different types of surface waves in the temporally evolving materials. These results reveal the dynamic interplay of surface tension, viscosity, and elasticity that is controlled by the kinetics of polymerization and crosslinking during hydrogel formation. RAR overcomes many limitations of conventional rheological approaches by offering a new way to comprehensively and longitudinally characterize soft materials during dynamic processes.
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| http://dx.doi.org/10.1016/j.biomaterials.2023.122282 | DOI Listing |
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