Université de Fribourg

Ultra-long range correlations of the dynamics of jammed soft matter

Maccarrone, S. ; Brambilla, G. ; Pravaz, O. ; Duri, Agnès ; Ciccotti, M. ; Fromental, J.-M. ; Pashkovski, E. ; Lips, A. ; Sessoms, David ; Trappe, Véronique ; Cipelletti, Luca

In: Soft Matter, 2010, vol. 6, no. 21, p. 5514-5522

We use photon correlation imaging, a recently introduced space-resolved dynamic light scattering method, to investigate the spatial correlation of the dynamics of a variety of jammed and glassy soft materials. Strikingly, we find that in deeply jammed soft materials spatial correlations of the dynamics are quite generally ultra-long ranged, extending up to the system size, orders of magnitude...

Université de Fribourg

Unexpected spatial distribution of bubble rearrangements in coarsening foams

Sessoms, David A. ; Bissig, Hugo ; Duri, Agnès ; Cipelletti, Luca ; Trappe, Véronique

In: Soft Matter, 2010, vol. 6, no. 13, p. 3030-3037

Foams are ideal model systems to study stress-driven dynamics, as stress-imbalances within the system are continuously generated by the coarsening process, which, unlike thermal fluctuations, can be conveniently quantified by optical means. However, the high turbidity of foams generally hinders the detailed study of the temporal and spatial distribution of topological bubble rearrangement events,...

Université de Fribourg

Resolving long-range spatial correlations in jammed colloidal systems using photon correlation

Duri, Agnès ; Sessoms, David A. ; Trappe, Véronique ; Cipelletti, Luca

In: Physical Review Letters, 2009, vol. 102, no. 08, p. 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....