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Related Concept Videos

Colloids03:22

Colloids

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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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Colloidal precipitates01:09

Colloidal precipitates

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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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Colloids and Suspensions01:17

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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 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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Coagulation01:06

Coagulation

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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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Solubility03:00

Solubility

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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).
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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Discrete state model of a self-aggregating colloidal system with directional interactions.

Salman Fariz Navas1, Sabine H L Klapp1

  • 1Institute for Theoretical Physics, Technical University of Berlin, Hardenbergstr. 36, 10623 Berlin, Germany.

The Journal of Chemical Physics
|December 16, 2024
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Summary

We developed a coarse-grained model for colloidal particle self-assembly, inspired by Markov state models. This model captures the kinetics of aggregate formation and evolution in electric and magnetic fields.

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Area of Science:

  • Colloid and Surface Science
  • Statistical Mechanics
  • Computational Biophysics

Background:

  • Coarse-grained models are crucial for understanding complex system kinetics, particularly in biophysics (e.g., Markov state models for protein folding).
  • Colloidal self-assembly driven by external fields presents a complex dynamic system that benefits from simplified modeling approaches.

Purpose of the Study:

  • To develop a coarse-grained, discrete state model for field-responsive colloidal particle self-aggregation.
  • To describe the kinetics of simultaneous aggregate formation and evolution from single particles.
  • To investigate how transition dynamics change with aggregate size and explore model validity.

Main Methods:

  • Developed a discrete state model based on local particle structure, analogous to Markov state modeling.
  • Utilized particle-resolved Brownian dynamics simulations as the basis for model development.
  • Defined states by particle local structure and modeled kinetics as stochastic, memoryless jumps.
  • Validated the model by comparing predicted population fractions with simulation data.

Main Results:

  • The coarse-grained model successfully describes the simultaneous formation and evolution of multiple colloidal aggregates.
  • The model accounts for changes in transition dynamics as the largest cluster size increases.
  • Validation confirmed good agreement between predicted and simulated population fractions across different aggregation stages.

Conclusions:

  • A novel coarse-grained discrete state model effectively captures the complex kinetics of colloidal self-aggregation in orthogonal electric and magnetic fields.
  • The model provides a computationally efficient approach to study self-assembly dynamics, adaptable to varying conditions and parameter changes.
  • Further exploration of detailed balance conditions in different aggregation stages is warranted.