Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-10-14
Physical Review Letters 102 (2009) 085702
Physics
Condensed Matter
Soft Condensed Matter
Published version (Phys. Rev. Lett. 102, 085702 (2009)) The Dynamical Activity Mapsprovided as Supplementary Online Material a
Scientific paper
10.1103/PhysRevLett.102.085702
We introduce a new dynamic light scattering method, termed photon correlation imaging, which enables us to resolve the dynamics of soft matter in space and time. We demonstrate photon correlation imaging by investigating the slow dynamics of a quasi two-dimensional coarsening foam made of highly packed, deformable bubbles and a rigid gel network formed by dilute, attractive colloidal particles. We find the dynamics of both systems to be determined by intermittent rearrangement events. For the foam, the rearrangements extend over a few bubbles, but a small dynamical correlation is observed up to macroscopic length scales. For the gel, dynamical correlations extend up to the system size. These results indicate that dynamical correlations can be extremely long-ranged in jammed systems and point to the key role of mechanical properties in determining their nature.
Cipelletti Luca
Duri Agnes
Sessoms David A.
Trappe Veronique
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