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Related Concept Videos

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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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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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 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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Synthesis and Characterization of Supramolecular Colloids
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Reversible and spatiotemporal control of colloidal structure formation.

H Dehne1, A Reitenbach1, A R Bausch2

  • 1Center for Protein Assemblies (CPA) and Lehrstuhl für Biophysik (E27), Physics Departement, Technische Universität München, D-85748, Garching, Germany.

Nature Communications
|November 24, 2021
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Summary

Researchers developed DNA reaction circuits to control the self-assembly of micron-sized particles, enabling dynamic and reversible colloidal structures. This breakthrough allows for autonomous, oscillating material formation without external forces.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Colloidal structure formation is key to developing functional materials with tunable properties.
  • Precise control over particle interactions is essential for complex material design.
  • Previous methods lacked control and reversibility, hindering autonomous oscillating systems.

Purpose of the Study:

  • To demonstrate a novel method for dynamic and reversible colloidal self-assembly using DNA reaction circuits.
  • To program sequential and spatial control over mesoscale structure formation.
  • To enable autonomous oscillating systems for active materials development.

Main Methods:

  • Utilizing tunable DNA reaction circuits to modulate linker strand concentrations.
  • Employing DNA-functionalized micron-sized particles for self-assembly.
  • Programming colloidal interactions in both sequential and spatial orders.

Main Results:

  • Achieved dynamic and fully reversible assembly of DNA-functionalized particles.
  • Demonstrated programmable, oscillatory structure formation on a mesoscopic scale.
  • Showcased the versatility of DNA reaction networks for controlling colloidal self-organization.

Conclusions:

  • DNA reaction circuits offer unprecedented dynamic control over colloidal self-assembly.
  • This approach enables the development of active materials with autonomous oscillating properties.
  • The findings pave the way for scalable, programmable functional materials.