http://www.cnr.it/ontology/cnr/individuo/prodotto/ID215913
Dynamical heterogeneities in the crossover region from colloidal gels to colloidal glasses (Articolo in rivista)
- Type
- Label
- Dynamical heterogeneities in the crossover region from colloidal gels to colloidal glasses (Articolo in rivista) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.4794600 (literal)
- Alternative label
A. Coniglio , A. de Candia, and A. Fierro (2013)
Dynamical heterogeneities in the crossover region from colloidal gels to colloidal glasses
in AIP conference proceedings; American Institute of Physics, Melville [NY] (Stati Uniti d'America)
(literal)
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- A. Coniglio , A. de Candia, and A. Fierro (literal)
- Pagina inizio
- Pagina fine
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- http://proceedings.aip.org/resource/2/apcpcs/1518/1/379_1 (literal)
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- CNR-SPIN and Department of Physics, University of Naples, via Cinthia, 80126 Napoli, Italy
INFN (Unit of Naples) (literal)
- Titolo
- Dynamical heterogeneities in the crossover region from colloidal gels to colloidal glasses (literal)
- Abstract
- Using molecular dynamics simulations, we study a DLVO-type model for attractive colloidal systems. In particular we
focus on the crossover from the gel-like regime, at low volume fraction, to the glassy-like regime, at higher volume fraction.
In such crossover region, some features of chemical gels and some features of glassy systems are present. The former are due
to long living clusters the latter to crowding effects, which both slow down the relaxation process.
The contribution of the long living clusters is obtained from the Àuctuations of the self-overlap, ?4 (t), by summing only
over pairs of particles, linked by persistent bonds (present at both times 0 and time t), the crowding contribution is instead
obtained from the remaining pairs of particles. For small volume fractions and low enough temperature, where the lifetime
of the bonds is dominant, essentially the cluster contribution is present. At higher volume fraction, where bond lifetime and
relaxation time start to be of the same order of magnitude, both contributions are manifest. The dependence of these two
contributions on the length scale a, which appears in the de¿nition of ?4 (t), is also interesting. The clustering contribution is
highly suppressed as a decreases, like in chemical gels, while the contribution due to crowding has a non-monotonic behaviour,
and it is maximum at intermediate values of a. (literal)
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