  Solutions of wormlike micelles can form cross-linked networks on microscopic
length scales. The unique mechanical properties of these complex fluids are
driven by the interplay between the network structure and dynamics which are
investigated by plate-plate rheometry and X-ray photon correlation
spectroscopy~(XPCS) nanorheology. Intensity auto-correlation functions of
tracer nanoparticles~(NPs) dispersed in micelle solutions were recorded which
captured both the slow structural network relaxation and the short-time
dynamics of NPs trapped in the network. The results are indicative of a
resonance-like dynamic behavior of the network on the nanoscale that develops
as a consequence of the intrinsic short-range rigidity of individual micelle
chains.
