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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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Colloidal precipitates01:09

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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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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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Coagulation01:06

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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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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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Precipitate Formation and Particle Size Control01:16

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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.
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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Kinetically guided colloidal structure formation.

Fabian M Hecht1, Andreas R Bausch2

  • 1Lehrstuhl für Zellbiophysik E27, Technische Universität München, 85748 Garching, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|July 23, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for creating mesoscale structures using colloidal particles. This kinetic approach, based on diffusion-limited cluster aggregation (DLCA), enables the rational design of anisotropic materials up to 26 µm.

Keywords:
DNA-coated colloidsdiffusion-limited cluster aggregationkinetic arrestmesoscopic structuremulticomponent

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Area of Science:

  • Colloidal science
  • Materials science
  • Nanotechnology

Background:

  • Colloidal particle self-organization is key for advanced materials.
  • Mesoscale structure fabrication (10-100 μm) is challenging due to long equilibration times.

Purpose of the Study:

  • To develop a method for rational design and production of mesoscale anisotropic structures.
  • To overcome limitations of equilibrium self-assembly for larger structures.

Main Methods:

  • Extended diffusion-limited cluster aggregation (DLCA) to multicomponent systems.
  • Utilized kinetic traps instead of avoiding them.
  • Tuned DNA-coated microsphere affinities, size, and stoichiometry for hierarchical aggregation.

Main Results:

  • Achieved rational design and production of finite-sized anisotropic structures.
  • Successfully produced mesoscale structures up to 26 µm in diameter.
  • Demonstrated that aggregation can be rationalized by an extended analytical DLCA model.

Conclusions:

  • Exploiting kinetic traps offers a powerful route for mesoscale structure formation.
  • The scale-free approach is adaptable to various multicomponent systems with orthogonal interactions.
  • Potential for creating novel materials with tailored optical, biochemical, and mechanical properties.