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Related Concept Videos

Colloids03:22

Colloids

20.4K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Colloids and Suspensions01:17

Colloids and Suspensions

2.9K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Colloidal precipitates01:09

Colloidal precipitates

4.6K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Metallic Solids02:37

Metallic Solids

20.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.6K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.6K
Solubility03:00

Solubility

20.6K
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

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Crystal structures in binary hard-sphere colloid-droplet mixtures with patchy cross interactions.

Hai Pham Van1,2, Andrea Fortini3, Matthias Schmidt1

  • 1Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, Universitätsstraße 30, D-95440 Bayreuth, Germany.

Physical Review. E
|February 20, 2020
PubMed
Summary
This summary is machine-generated.

Metropolis Monte Carlo simulations reveal stable colloidal crystal structures, including ZnS and CaF2 analogs, with coexisting droplet and colloid phases. Anisotropic interactions lead to richer phase diagrams and novel crystal structures without atomic analogs.

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Area of Science:

  • Colloid Science
  • Materials Science
  • Computational Physics

Background:

  • Understanding phase behavior in binary mixtures of colloids and droplets is crucial for designing novel materials.
  • Patchy colloids offer tunable interactions for self-assembly, but their phase diagrams are complex.
  • Previous studies have explored isotropic interactions; anisotropic interactions are less understood.

Purpose of the Study:

  • To investigate the self-assembly and phase behavior of a binary mixture of droplets and tetrahedral patchy colloids.
  • To explore the impact of anisotropic colloid-droplet interactions on the resulting phase diagram.
  • To identify and characterize novel colloidal crystal structures.

Main Methods:

  • Metropolis Monte Carlo simulations were employed to model the interactions between droplets and patchy colloids.
  • Hard-sphere interactions were used for colloid-colloid and droplet-droplet interactions, with attractive interactions mediated by colloidal patches.
  • Simulations explored both isotropic and anisotropic (tetrahedral and square planar) patch arrangements.

Main Results:

  • Stable crystal structures analogous to ZnS, CaF2, face-centered cubic (fcc), and hexagonal close-packed (hcp) droplet lattices were observed coexisting with a dispersed colloid fluid.
  • Simulated structures showed good agreement with close-packing predictions for intermediate size ratios, with discrepancies at low and high ratios.
  • Anisotropic interactions, particularly square planar, yielded richer phase diagrams (e.g., ZnS-gas and ZnS-fluid coexistence) and a novel crystal structure with two interpenetrating fcc/hcp lattices.

Conclusions:

  • Colloidal crystals with atomic analogs can be formed through self-assembly of droplet-colloid mixtures.
  • Anisotropic colloid-droplet interactions significantly enrich the phase behavior and enable the formation of unprecedented structures.
  • Generic models of anisotropic colloid-droplet mixtures offer a promising route for fabricating complex colloidal materials.