|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
19 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Unexpected drop of dynamical heterogeneities in colloidal suspensions approaching the jamming transition | | Pierre Ballesta
; Agnes Duri
; Luca Cipelletti
; | | Date: |
2 Jul 2008 | | Abstract: | As the glass (in molecular fluidscite{Donth}) or the jamming (in colloids
and grainscite{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
$xi$cite{WeeksScience2000,DauchotPRL2005,Glotzer,Ediger}. On approaching
these transitions, $xi$ grows in glass-formerscite{Glotzer,Ediger},
colloidscite{WeeksScience2000,BerthierScience2005}, and driven granular
materialscite{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’’, $chi^*$, whose growth is usually
associated to that of $xi$cite{LacevicPRE}. $chi^*$ initially increases with
volume fraction $phi$, as incite{KeysNaturePhys2007}, but strikingly drops
dramatically very close to jamming. We show that this unexpected behavior
results from the competition between the growth of $xi$ and the reduced
particle displacements associated with rearrangements in very dense
suspensions, unveiling a richer-than-expected scenario. | | Source: | arXiv, 0807.0281 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER