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Related Concept Videos

Colloids03:22

Colloids

21.5K
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...
21.5K
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
Colloids and Suspensions01:17

Colloids and Suspensions

3.6K
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...
3.6K
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

65.6K
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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Synthesis and Characterization of Supramolecular Colloids
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Molecular Recognition in the Colloidal World.

Elizabeth Elacqua1,2, Xiaolong Zheng1, Cicely Shillingford1

  • 1Molecular Design Institute and Department of Chemistry, New York University , New York, New York 10003-6688, United States.

Accounts of Chemical Research
|October 7, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed supramolecular assembly routes to precisely control colloidal particle arrangement. This enables the creation of functional nanomaterials and dynamic crystalline structures with programmable bonding for advanced applications.

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Area of Science:

  • Nanomaterials Science
  • Supramolecular Chemistry
  • Materials Engineering

Background:

  • Colloidal self-assembly is key for fabricating functional nanomaterials.
  • Current methods struggle with precise control over particle functionalization and reversible assembly.
  • Anisotropic colloidal particles and site-specific surface decoration are emerging.

Purpose of the Study:

  • To describe supramolecular assembly routes for precise colloidal particle organization.
  • To enable the design of programmable, reconfigurable colloidal assemblies.
  • To integrate molecular recognition principles into colloidal systems.

Main Methods:

  • Fabrication of colloidal particles with surface-exposed functional groups.
  • Programmable conjugation to install high-fidelity recognition motifs.
  • Utilizing noncovalent molecular interactions like DNA hybridization, host-guest, and metal coordination.

Main Results:

  • Demonstrated supramolecular assembly routes for precise colloidal architectures and crystalline lattices.
  • Engineered dual-responsive DNA-mediated orthogonal assembly and colloidal clusters.
  • Developed strategies for complex superstructures with phase transitions and functionalized colloidal crystals.

Conclusions:

  • Coupling noncovalent interactions with colloidal platforms enables reconfigurable functional architectures.
  • Directional strategies offer molecular control for dynamic assembly of 1D, 2D, and 3D lattices.
  • This approach facilitates the fabrication of designer materials for applications in optics, electronics, and photonics.