Colloidal gels: equilibrium and non-equilibrium routes
@article{Zaccarelli2007ColloidalGE, title={Colloidal gels: equilibrium and non-equilibrium routes}, author={Emanuela Zaccarelli}, journal={Journal of Physics: Condensed Matter}, year={2007}, volume={19}, pages={323101} }
We attempt a classification of different colloidal gels based on colloid–colloid interactions. We discriminate primarily between non-equilibrium and equilibrium routes to gelation, the former case being slaved to thermodynamic phase separation while the latter is individuated in the framework of competing interactions and of patchy colloids. Emphasis is put on recent numerical simulations of colloidal gelation and their connection to experiments. Finally, we underline typical signatures of…
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References
SHOWING 1-10 OF 489 REFERENCES
Percolation, gelation and dynamical behaviour in colloids
- Biology
- 2004
This study made a connection between classical gelation and the phenomenology of colloidal systems, suggesting that gelation phenomena in attractive colloids at low temperature and low volume fraction can be described in terms of a two-line scenario.
Non-equilibrium behavior of sticky colloidal particles: beads, clusters and gels
- Chemistry, PhysicsThe European physical journal. E, Soft matter
- 2005
The interaction of a metastable liquid-liquid binodal and an ergodic to non-ergodic transition boundary inside the equilibrium crystallization region can explain the non-equilibrium behavior of colloidal particles with short-range attraction.
Comparative simulation study of colloidal gels and glasses.
- PhysicsPhysical review letters
- 2002
Using computer simulations, the mechanisms causing aggregation and structural arrest of colloidal suspensions interacting with a short-ranged attraction at moderate and high densities are identified and correctly predicted by mode coupling theory.
A unifying model for chemical and colloidal gels
- Biology
- 2003
A crossover from the chemical gelation behaviour to dynamics more typical of colloidal systems is described by opportunely varying some model parameter by means of Monte Carlo simulations of a minimal statistical mechanics model.
Competition between glass transition and liquid-gas separation in attracting colloids
- Materials Science
- 2007
We present simulation results addressing the phenomenon of colloidal gelation induced by attractive interactions. The liquid–gas transition is prevented by the glass arrest at high enough attraction…
Cluster mode-coupling approach to weak gelation in attractive colloids.
- PhysicsPhysical review letters
- 2004
It is argued that weak gelation in colloids can be idealized as a two-stage ergodicity breaking: first at short scales (approximated by the bare MCT) and then at larger scales (governed by MCT applied to clusters).
Reversible gelation and dynamical arrest of dipolar colloids
- Physics
- 2007
We use molecular dynamics simulations of a simple model to show that dispersions of slightly elongated colloidal particles with long-range dipolar interactions, like ferrofluids, can form a physical…
Phase separation, aggregation and gelation in colloid-polymer mixtures and related systems
- Chemistry
- 1998
Columnar and lamellar phases in attractive colloidal systems.
- Materials SciencePhysical review. E, Statistical, nonlinear, and soft matter physics
- 2006
It is shown that, in the region of parameter space where gelation occurs, the stable thermodynamical phase is a crystalline columnar one, which seems to have a still longer ordering time than at higher volume fractions.