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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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 the...
Colloidal precipitates01:09

Colloidal precipitates

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...
Colloids03:22

Colloids

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...
The Phosphorus Cycle01:21

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
08:54

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

Published on: May 25, 2016

Transition-metal phosphate colloidal spheres.

Chen Chen1, Wei Chen, Jun Lu

  • 1Department of Chemistry, Tsinghua University, Beijing, PR China.

Angewandte Chemie (International Ed. in English)
|May 28, 2009
PubMed
Summary
This summary is machine-generated.

Researchers synthesized transition-metal phosphate colloidal spheres using various single and multiple metals. Porous and hollow iron phosphate spheres were also created by adjusting reaction pH, offering new material possibilities.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Nanotechnology

Background:

  • Colloidal spheres are important in various applications.
  • Transition-metal phosphates offer unique properties.
  • Controlled synthesis of nanostructures is crucial for advanced materials.

Purpose of the Study:

  • To synthesize novel transition-metal phosphate colloidal spheres.
  • To explore single and multiple metal compositions.
  • To develop methods for creating porous and hollow structures.

Main Methods:

  • Solution-phase synthesis at low temperatures.
  • Utilizing various transition metals (Mn, Fe, Co, Ni, Cu).
  • pH adjustment to control morphology (porous, hollow).

Main Results:

  • Successfully synthesized single-metal (Mn, Fe, Co, Ni, Cu) phosphate colloidal spheres.
  • Created multi-metal (e.g., Fe-Ni, Co-Cu, Fe-Co-Ni-Cu-Zn) phosphate colloidal spheres.
  • Achieved porous and hollow iron phosphate spheres via pH control.

Conclusions:

  • Demonstrated versatile synthesis of transition-metal phosphate colloidal spheres.
  • Established a method for tailoring sphere porosity and hollowness.
  • Opened avenues for applications in catalysis, energy storage, and sensing.