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Related Concept Videos

The Colloidal State01:29

The Colloidal State

152
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

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

Colloids and Suspensions

3.9K
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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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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Centrifugation01:05

Centrifugation

8.9K
Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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Synthesis and Characterization of Supramolecular Colloids
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Surface-dictated sorting in colloidal mixtures.

Jintao Tong1, Shihao Zang2, Xiangyu Dou1

  • 1Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China.

Journal of Colloid and Interface Science
|April 3, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed surface-dictated rules for selective assembly in mixed colloidal systems. These strategies enable controlled clustering of different particle types based on their surface chemistry, advancing colloidal science.

Keywords:
Colloid mixtureSelective colloidal assemblySurface groupsSurface hydrophilicity/hydrophobicity

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Area of Science:

  • Colloidal Science
  • Materials Science
  • Surface Chemistry

Background:

  • Colloidal mixtures contain diverse particles with unique surface properties.
  • Controlling the assembly of these mixed colloids is challenging due to surface chemistry differences.

Purpose of the Study:

  • To establish surface-dictated sorting rules for selective assembly in mixed colloidal systems.
  • To demonstrate strategies for controlling particle interactions and assembly based on surface chemistry.

Main Methods:

  • Utilized seven types of uniformly sized (∼2 μm) negatively charged colloids.
  • Employed pH and solvent dielectric tuning to control surface group dissociation.
  • Introduced small molecules (urea) to disrupt hydrogen-bonding networks.
  • Applied depletion-driven assembly using Pluronic surfactants to create surface brushes.

Main Results:

  • Identified three distinct strategies for selective colloidal assembly.
  • pH/solvent tuning induced clustering of particles with neutral surface groups (M-OH, -COOH).
  • Urea selectively destabilized hydroxyl-rich inorganic particles.
  • Pluronic surfactants promoted hydrophobic particle assembly via enhanced depletion attraction.
  • Demonstrated oriented assembly of SiO2/Pt Janus particles under depletion conditions.

Conclusions:

  • Surface chemistry dictates selective assembly in mixed colloidal systems.
  • The developed strategies offer precise control over colloidal self-assembly.
  • These findings have implications for designing complex colloidal structures and materials.