Fig. 2. Linear properties of treated and untreated collagen gels: Matrigel and hybrid gels.
(a) Storage module G′ (filled symbols) of collagen and Matrigel dominates corresponding loss module G″ independent of the frequency. (b) Comparison of G′, G″, and phase angle tan δ of all studied hydrogels. (c) Representative development of the relaxation module G(t) of collagen and Matrigel normalized by G′ during a strain jump of 80%.