Probing interaction forces in colloidal monolayers: Inversion of structural data

@article{QuesadaPrez2001ProbingIF,
  title={Probing interaction forces in colloidal monolayers: Inversion of structural data},
  author={Manuel Quesada-P{\'e}rez and Arturo Moncho-Jord{\'a} and Francisco J. Mart{\'i}nez-L{\'o}pez and Roque Hidalgo-{\'A}lvarez},
  journal={Journal of Chemical Physics},
  year={2001},
  volume={115},
  pages={10897-10902}
}
The knowledge of the potential between interacting colloidal particles is essential to describe and control the aggregation processes in which they are involved. However, interaction forces also bring out spatial ordering phenomena, which has been used to obtain helpful information on them in three-dimensional dispersions. In this paper we look into this possibility for colloidal monolayers spread at the water–air interface. The radial distribution function has been determined for an assembly… 

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References

SHOWING 1-10 OF 31 REFERENCES

Molecular Dynamics Simulation of the Surface Pressure of Colloidal Monolayers

The compression of two-dimensional colloidal monolayers consisting of polystyrene particles at an oil−water interface is investigated theoretically. Expressions for the pair−particle interactions are

Colloidal Interaction at the Air-Liquid Interface.

TLDR
Numerical computation revealed the most important parameter in determining the total interaction is the density of dipoles at the external surface of the particles, and found significant differences for the pair potential between hydrophobic and hydrophilic particles.

Long-range attraction between colloidal spheres at the air-water interface: the consequence of an irregular meniscus

  • StamouDuschlJohannsmann
  • Materials Science
    Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
  • 2000
TLDR
A mechanism for attraction which is based on nonuniform wetting causing an irregular shape of the particle meniscus is proposed, including the cluster dissolution caused by addition of detergent to the subphase and the formation of linear aggregates.

Hydrodynamic Interactions May Enhance the Self-Diffusion of Colloidal Particles

We report experimental evidence for an enhancement, due to the hydrodynamic interactions (HI), of the self-diffusion function ${D}_{s}(t)$ of colloidal particles at intermediate and long times.

Formation of meso-structures in colloidal monolayers

The spontaneous formation of loosely bound ordered aggregates has been observed in colloidal monolayers trapped at the air/water interface. The distance between particles in these meso-structures is

Experimental study of colloidal aggregation in two dimensions. I. Structural aspects.

The morphology of structures formed during the two-dimensional aggregation of colloidal particles at a liquid surface has been studied. The aggregation was induced by adding CaCl 2 solution to the

Interaction forces in charged colloids: Inversion of static structure factors

A simple, easily usable 'predictor-corrector' inversion method is presented for extracting the effective pair potential u(r) from static structure factor S(q) of colloidal dispersions and liquids.

When Like Charges Attract: The Effects of Geometrical Confinement on Long-Range Colloidal Interactions.

High-resolution measurements of the interaction potential between pairs of charged colloidal microspheres suspended in water provide stringent tests for theories of colloidal interactions. The

Structure and dynamics of two-dimensional colloidal crystals in confined geometry

The properties of two-dimensional (2D) colloidal crystals have been widely investigated during the last 20 years, but only little attention has been paid to effects of finite system size. We use

Two-Dimensional Interfacial Colloidal Crystals

Polystyrene spheres (2450 \AA{} in diameter) are trapped in a surface energy well at water/air interface. Because of asymmetry of charge distribution, electrical dipoles are associated with each