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Of all current detection techniques with nanometer resolution, only X-raymicroscopy allows imaging nanoparticles in suspension. Can it also be used toinvestigate structural dynamics? When studying response to mechanical stimuli,the challenge lies in applying them with precision comparable to spatialresolution. In the first shear experiments performed in an X-ray microscope, weaccomplished this by inserting a piezo actuator driven shear cell into thefocal plane of a scanning transmission X-ray microscope (STXM). Thusshear-induced reorganization of magnetite nanoparticle aggregates could bedemonstrated in suspension. As X-ray microscopy proves suitable for studyingstructural change, new prospects open up in physics at small length scales.

Time-resolved X-ray microscopy of nanoparticle aggregates under oscillatory shear