Bond formation and slow heterogeneous dynamics in adhesive spheres with long-ranged repulsion: quantitative test of mode coupling theory

O. Henrich, A. M. Puertas, M. Sperl, J. Baschnagel, M. Fuchs

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A colloidal system of spheres interacting with both a deep and narrow attractive potential and a shallow long-ranged barrier exhibits a prepeak in the static structure factor. This peak can be related to an additional mesoscopic length scale of clusters and/or voids in the system. Simulation studies of this system have revealed that it vitrifies upon increasing the attraction into a gel-like solid at intermediate densities. The dynamics at the mesoscopic length scale corresponding to the prepeak represents the slowest mode in the system. Using mode coupling theory with all input directly taken from simulations, we reveal the mechanism for glassy arrest in the system at 40% packing fraction. The effects of the low- q peak and of polydispersity are considered in detail. We demonstrate that the local formation of physical bonds is the process whose slowing down causes arrest. It remains largely unaffected by the large-scale heterogeneities, and sets the clock for the slow cluster mode. Results from mode-coupling theory without adjustable parameters agree semiquantitatively with the local density correlators but overestimate the lifetime of the mesoscopic structure (voids).

LanguageEnglish
Article number031404
Number of pages10
JournalPhysical Review E
Volume76
Issue number3
DOIs
Publication statusPublished - 27 Sep 2007

Fingerprint

Mode Coupling Theory
Adhesives
adhesives
coupled modes
voids
Voids
Length Scale
correlators
clocks
attraction
Polydispersity
simulation
gels
Structure Factor
Correlator
life (durability)
causes
Packing
Lifetime
Simulation Study

Keywords

  • mode coupling theory (MCT)
  • adhesion
  • chemical bonds
  • computer simulation
  • parameter estimation

Cite this

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Bond formation and slow heterogeneous dynamics in adhesive spheres with long-ranged repulsion : quantitative test of mode coupling theory. / Henrich, O.; Puertas, A. M.; Sperl, M.; Baschnagel, J.; Fuchs, M.

In: Physical Review E, Vol. 76, No. 3, 031404, 27.09.2007.

Research output: Contribution to journalArticle

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