Fig. 4.

Ergodic and Non-ergodic Materials Exhibit Different Scattering Intensity Dependence on Detector Position. The scattering intensity and rheological profile from DLSμR are shown for poly(ethylene glycol) solutions and gels formed with thiol-vinylsulfone bonds at two concentrations: 3 wt% and 5 wt%, below and above the sol-gel transition, respectively. The scattering intensity as a function of position from the detector is shown for (a) the ergodic, sol phase and (b) the non-ergodic, gel phase. Complex moduli are also shown for (c) the ergodic, sol phase and (b) the non-ergodic, gel phase.