Unexpected drop of dynamical heterogeneities in colloidal suspensions approaching the jamming transition

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dc.creatorBallesta, Pierre
dc.creatorDuri, Agnes
dc.creatorCipelletti, Luca
dc.date2008-07-02
dc.date.accessioned2026-07-07T09:48:02Z
dc.date.available2026-07-07T09:48:02Z
dc.descriptionAs the glass (in molecular fluids\cite{Donth}) or the jamming (in colloids and grains\cite{LiuNature1998}) transitions are approached, the dynamics slow down dramatically with no marked structural changes. Dynamical heterogeneity (DH) plays a crucial role: structural relaxation occurs through correlated rearrangements of particle ``blobs'' of size $ξ$\cite{WeeksScience2000,DauchotPRL2005,Glotzer,Ediger}. On approaching these transitions, $ξ$ grows in glass-formers\cite{Glotzer,Ediger}, colloids\cite{WeeksScience2000,BerthierScience2005}, and driven granular materials\cite{KeysNaturePhys2007} alike, strengthening the analogies between the glass and the jamming transitions. However, little is known yet on the behavior of DH very close to dynamical arrest. Here, we measure in colloids the maximum of a ``dynamical susceptibility'', $χ^*$, whose growth is usually associated to that of $ξ$\cite{LacevicPRE}. $χ^*$ initially increases with volume fraction $ϕ$, as in\cite{KeysNaturePhys2007}, but strikingly drops dramatically very close to jamming. We show that this unexpected behavior results from the competition between the growth of $ξ$ and the reduced particle displacements associated with rearrangements in very dense suspensions, unveiling a richer-than-expected scenario.
dc.description1st version originally submitted to Nature Physics. See the Nature Physics website fro the final, published version
dc.identifierhttps://arxiv.org/abs/0807.0281
dc.identifierhttp://arxiv.org/abs/0807.0281
dc.identifierNature Physics 4 (2008) 550-554
dc.identifierdoi:10.1038/nphys1000
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/164061
dc.subjectSoft Condensed Matter
dc.titleUnexpected drop of dynamical heterogeneities in colloidal suspensions approaching the jamming transition
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