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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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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Colloids and Suspensions01:17

Colloids and Suspensions

1.8K
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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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).
In a solution, the solute particles (molecules,...
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Entropy and Solvation02:05

Entropy and Solvation

7.0K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Thermodynamically Stable Colloidal Solids: Interfacial Thermodynamics from the Particle Size Distribution.

Andrew Nelson1, Lawrence H Friedman1

  • 1Materials Measurement Science Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
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Summary
This summary is machine-generated.

This study applies classical nucleation theory to colloidal systems, revealing size-dependent interfacial free energy crucial for understanding nanoparticle stability. Findings suggest some systems may be metastable, not absolutely stable.

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Area of Science:

  • Colloid and Surface Science
  • Materials Chemistry
  • Thermodynamics

Background:

  • True thermodynamic stability in solid colloidal dispersions is rare and under-investigated.
  • Understanding long-term stability and preparation pathway insensitivity is of significant interest.
  • Existing models often assume absolute thermodynamic stability, which may not hold true.

Purpose of the Study:

  • To apply classical nucleation theory (CNT) to colloidal systems to link particle size distribution with size-dependent interfacial free energy.
  • To fit experimental data of nanoparticle size distributions using CNT.
  • To investigate the thermodynamic stability of gold-thiol and magnetite nanoparticle systems.

Main Methods:

  • Applied classical nucleation theory (CNT) to model colloidal systems.
  • Related interfacial free energy density to particle size distribution.
  • Fitted experimental size distribution data for gold-thiol and magnetite nanoparticles using CNT.

Main Results:

  • Gold-thiol system data fit well with interfacial free energy (γ) following a power law of r⁻³.
  • Magnetite nanoparticle data fit well with CNT, with γ following a power law of r⁻².
  • Extrapolated flat surface free energy density was small and positive; systems appear metastable.

Conclusions:

  • Classical nucleation theory effectively describes size-dependent interfacial free energy in colloidal systems.
  • The studied gold-thiol and magnetite systems are likely metastable, challenging assumptions of absolute stability.
  • Derived expressions for interfacial energy parameters relevant for future research on surfactant concentration, temperature, and particle distribution.