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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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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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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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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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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Synthesis and Characterization of Supramolecular Colloids
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Co-assembly of nanometer- and submicrometer-sized colloidal particles into multi-component ordered superstructures.

Javier Fonseca1, Li Jiao1, Anna Broto-Ribas2

  • 1Department of Chemical Engineering, Northeastern University, 313 Snell Engineering Center, 360 Huntington Avenue, Boston, Massachusetts 02115-5000, USA. fonsecagarcia.j@northeastern.edu.

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Summary

Researchers are exploring the bottom-up assembly of uniform colloidal particles to create advanced metamaterials. This review details methods for co-assembling diverse particles into ordered superstructures with novel properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloid Science

Background:

  • Material discovery often relies on empirical methods, limiting precise scientific prediction.
  • Uniform colloidal particles offer a promising route for constructing functional superstructures.
  • Co-assembly of multiple particle types enables the creation of metamaterials with emergent properties.

Purpose of the Study:

  • To systematically review the co-assembly of uniform colloidal particles into multi-component superstructures.
  • To cover the fundamentals of particle assembly, including particle synthesis, stability, and interparticle forces.
  • To discuss assembly kinetics, preparation methods, defect management, and characterization.

Main Methods:

  • Review of literature on colloidal particle synthesis and characterization.
  • Analysis of co-assembly processes and resulting superstructure formation.
  • Exploration of methods for controlling colloidal stability and interparticle forces.

Main Results:

  • Co-assembly of diverse colloidal particles leads to ordered multi-component superstructures (metamaterials).
  • Emergent properties arise from synergistic interactions between different particle types.
  • Systematic understanding of assembly fundamentals, kinetics, and defect control is crucial.

Conclusions:

  • Co-assembly of uniform colloidal particles is a powerful bottom-up strategy for designing advanced metamaterials.
  • Further research is needed to overcome challenges and unlock opportunities in designing ordered multi-component superstructures.
  • This approach holds significant potential for creating materials with tailored functionalities.