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Related Concept Videos

Coagulation01:06

Coagulation

1.1K
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...
1.1K
Colloidal precipitates01:09

Colloidal precipitates

4.5K
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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Colloids and Suspensions01:17

Colloids and Suspensions

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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...
2.9K
Colloids03:22

Colloids

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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...
20.4K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

19.7K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
19.7K
Qualitative Analysis03:46

Qualitative Analysis

23.5K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

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Ionic solids from common colloids.

Theodore Hueckel1, Glen M Hocky1, Jeremie Palacci2

  • 1Department of Chemistry, New York University, New York, NY, USA.

Nature
|April 24, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed polymer-attenuated Coulombic self-assembly to create ionic colloidal crystals in water. This method uses neutral polymers to control particle interactions, enabling tunable crystallization of complex structures from simple colloids.

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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Crystallography

Background:

  • Complex structures typically form from attractive forces, but micron-scale colloids in water often form non-equilibrium structures like gels.
  • Previous methods for binary crystal growth required engineered particles, not utilizing native surface charge in aqueous conditions.

Purpose of the Study:

  • To develop a novel method for forming ionic colloidal crystals in water using native surface charge.
  • To demonstrate the ability to control colloidal assembly (dispersion, crystallization, or fixation) on demand.

Main Methods:

  • Introduced polymer-attenuated Coulombic self-assembly, using neutral polymers to precisely control inter-particle distances.
  • Tuned the attractive overlap of electrical double layers by adjusting polymer concentration and salt content.
  • Utilized Debye screening length to control nucleation and growth of macroscopic single crystals.

Main Results:

  • Successfully formed ionic colloidal crystals in water using a polymer-attenuated approach.
  • Achieved crystals isostructural to known inorganic compounds (e.g., CsCl, NaCl, AlB2, K4C60) by selecting appropriate particle size ratios.
  • Demonstrated the ability to fix crystals by diluting salts and extract them for further manipulation.

Conclusions:

  • Polymer-attenuated Coulombic self-assembly offers a versatile method for creating crystalline colloidal materials in aqueous solutions.
  • This approach enables the use of conventional colloids as model colloidal ions for crystallization, simplifying material design.
  • The method allows for precise control over assembly processes, translating solution-phase structures to solid-state materials.