Colloidal matter: Packing, geometry, and entropy

@article{Manoharan2015ColloidalMP,
  title={Colloidal matter: Packing, geometry, and entropy},
  author={Vinothan N. Manoharan},
  journal={Science},
  year={2015},
  volume={349}
}
Learning from the packing of particles Colloidal particles, which consist of clusters of hundreds or thousands of atoms, can still resemble atomic systems. In particular, colloids have been used to study the packing of spheres and the influence of short-range interactions on crystallization and melting. Manoharan reviews these similarities, as well as the cases in which colloidal particles show behavior not seen in atomic systems. For example, the packing of nonspherical objects, where geometry… 
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References

SHOWING 1-10 OF 123 REFERENCES
Phase behaviour of concentrated suspensions of nearly hard colloidal spheres
Suspensions of spherical colloidal particles in a liquid show a fascinating variety of phase behaviour which can mimic that of simple atomic liquids and solids. ‘Colloidal fluids’1–4, in which there
Colloidal assembly: the road from particles to colloidal molecules and crystals.
TLDR
This Review highlights recent experimental and theoretical progress in the assembly of colloids larger than 50 nm.
Topological colloids
TLDR
These findings lay the groundwork for new applications of colloids and liquid crystals that range from topological memory devices, through new types of self-assembly, to the experimental study of low-dimensional topology.
The Free-Energy Landscape of Clusters of Attractive Hard Spheres
TLDR
It is found that highly symmetric clusters are strongly suppressed by rotational entropy, whereas the most stable clusters have anharmonic vibrational modes or extra bonds, many of which are subsets of close-packed lattices.
Understanding shape entropy through local dense packing
TLDR
It is shown quantitatively that shape drives the phase behavior of systems of anisotropic particles upon crowding through DEFs, and the mechanism that generates directional entropic forces is the maximization of entropy by optimizing local particle packing.
THE EFFECTS OF SHAPE ON THE INTERACTION OF COLLOIDAL PARTICLES
Introdzution. The shapes of colloidal particles are often reasonably compact, so that no diameter greatly exceeds the cube root of the volume of the particle. On the other hand, we know many coiloids
Entropy-driven formation of large icosahedral colloidal clusters by spherical confinement.
TLDR
It is reported that entropy and spherical confinement suffice for the formation of icosahedral clusters consisting of up to 100,000 particles that are entropically favoured over the bulk face-centred cubic crystal structure.
Melting of Colloidal Crystals
Crystal melting is affected by many factors such as defects, surfaces, dimensionality, lattice structure, and particle interaction, and thus exhibits rich phenomenology. It is usually a first‐order
The physics of the colloidal glass transition.
As one increases the concentration of a colloidal suspension, the system exhibits a dramatic increase in viscosity. Beyond a certain concentration, the system is said to be a colloidal glass;
Thermodynamic stability of a smectic phase in a system of hard rods
One of the most remarkable phenomena exhibited by colloidal suspensions of monodisperse rod-like particles is the spontaneous formation of smectic liquid crystals1–5. In these smectic phases, the
...
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