Dynamics and rheology under continuous shear flow studied by X-ray photon correlation spectroscopy

摘要: X-ray Photon Correlation Spectroscopy (XPCS) has emerged as a unique technique allowing the measurement of dynamics in materials on mesoscopic lengthscales. In particular, applications soft matter physics cover broad range topics which include, but are not limited to, nanostructured such colloidal suspensions or polymers, at liquid surfaces, membranes and interfaces, glass gel transition. One most common problems associated with use bright beams is beam induced radiation damage, this likely to become an even more limiting factor future synchrotron free electron laser sources. Flowing sample during data acquisition one simplest method limit damage. addition distributing dose over many different scatterers, also enables new functionalities time-resolved studies mixing cells. Here, we further develop experimental that was recently proposed combining XPCS continuously flowing samples. More specifically, model system show how macroscopic advective response flow microscopic dissipative (diffusion) can be quantified from data. The potential applications, e.g. glasses gels under continuous shear/flow, protein aggregations processes, interplay between rheology complex fluids.