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Related Concept Videos

Colloids03:22

Colloids

21.7K
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...
21.7K
The Colloidal State01:29

The Colloidal State

27
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...
27
Colloids and Suspensions01:17

Colloids and Suspensions

3.7K
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...
3.7K
Colloidal precipitates01:09

Colloidal precipitates

6.6K
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...
6.6K
Coagulation01:06

Coagulation

1.5K
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...
1.5K

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Related Experiment Video

Updated: Feb 28, 2026

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

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Staggered Linear Assembly of Spherical-Cap Colloids.

Yogesh Shelke1, Manigandan Sabapathy1, Ethayaraja Mani1

  • 1Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology , Madras, Chennai 600036, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 16, 2017
PubMed
Summary

Researchers developed a facile fluid-fluid interface method to create spherical-cap polymeric particles. These particles spontaneously self-assemble into linear zigzag arrangements due to shape and charge, offering new avenues for biological and material science applications.

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Area of Science:

  • Colloid science
  • Polymer science
  • Self-assembly

Background:

  • Linear assembly of colloidal particles is crucial for understanding polymer dynamics and biological processes.
  • Existing methods often require complex setups like microfluidics or external fields.

Purpose of the Study:

  • To develop a facile, field-free method for synthesizing and self-assembling colloidal particles into linear arrangements.
  • To investigate the driving forces behind spontaneous linear assembly of anisotropic particles.

Main Methods:

  • Synthesis of spherical-cap polymeric latex particles at a fluid-fluid interface.
  • Observation and analysis of spontaneous particle self-assembly.
  • Justification of assembly mechanism using DLVO theory.

Main Results:

  • Spherical-cap particles spontaneously self-assembled into zigzag linear arrangements.
  • Assembly is driven by particle shape anisotropy and heterogeneous surface charge distribution.
  • The self-assembly mechanism was robust across various particle sizes and aspect ratios.

Conclusions:

  • A novel, facile fluid-fluid interface method enables spontaneous linear assembly of anisotropic colloidal particles without external fields.
  • The findings provide insights into colloidal self-assembly driven by shape and charge.
  • These assemblies have potential applications in studying protein aggregation and creating artificial microorganisms.