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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Colloids03:22

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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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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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Recrystallization: Solid–Solution Equilibria01:10

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Hydrodynamic interactions slow down crystallization of soft colloids.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Physics

Background:

  • Colloidal suspensions are widely used to model phase transitions like crystallization.
  • It is commonly assumed that solvent effects, beyond bulk diffusion, do not influence crystallization dynamics.
  • This assumption suggests findings from colloidal systems are directly transferable to pure melts.

Purpose of the Study:

  • To investigate the impact of hydrodynamic interactions on crystallization in colloidal suspensions.
  • To challenge the assumption that colloidal crystallization models are directly applicable to solvent-free melts.
  • To compare implicit and explicit solvent models for simulating colloidal crystallization.

Main Methods:

  • Molecular dynamics simulations of colloidal suspensions with Yukawa interactions.
  • Modeling solvent effects using Langevin dynamics (implicit) and the fluctuating lattice Boltzmann method (explicit).
  • Analyzing crystal growth velocity and the layering region dynamics.

Main Results:

  • Hydrodynamic interactions significantly reduce crystal growth velocity, even at moderate coupling.
  • The width of the layering region ahead of the growing crystal is reduced by hydrodynamic interactions.
  • Simulations reveal distinct dynamics between colloidal suspensions and melts.

Conclusions:

  • Colloidal suspension dynamics differ significantly from solvent-free melts.
  • Hydrodynamic interactions are crucial and cannot be ignored when using colloids as melt models.
  • The transferability of colloidal crystallization findings to pure melts is less straightforward than previously believed.