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Separating poroviscoelastic deformation mechanisms in hydrogels
Authors
,
H Brawn
+5 more
TL Fletcher
ML Oyen
DGT Strange
K Tonsomboon
X Zhao
Publication date
21 January 2013
Publisher
Abstract
Hydrogels have applications in drug delivery, mechanical actuation, and regenerative medicine. When hydrogels are deformed, load-relaxation arising from fluid flow - poroelasticity - and from rearrangement of the polymer network - viscoelasticity - is observed. The physical mechanisms are different in that poroelastic relaxation varies with experimental length-scale while viscoelastic does not. Here, we show that poroviscoelastic load-relaxation is the product of the two individual responses. The difference in length-scale dependence of the two mechanisms can be exploited to uniquely determine poroviscoelastic properties from simultaneous analysis of multi-scale indentation experiments, providing insight into hydrogel physical behavior. © 2013 American Institute of Physics
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Last time updated on 15/07/2020