Ref HAL: hal-00330408_v3
PMID 19257754
Ref Arxiv: 0810.2431
DOI: 10.1103/PhysRevLett.102.085702
WoS: 000263816200033
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
74 Citations
Résumé:

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.

Commentaires: Published version (Phys. Rev. Lett. 102, 085702 (2009)) The Dynamical Activity Mapsprovided as Supplementary Online Material are also available on w3.lcvn.univ-montp2.fr/~lucacip/dam/movies.htm