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Related Concept Videos

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...
Colloids and Suspensions01:17

Colloids and Suspensions

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...
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...
Coagulation01:06

Coagulation

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...
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...

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Related Experiment Video

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Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Synthesis and Characterization of Molybdenum Based Colloidal Particles

Moreno1, Vidoni, Ovalles

  • 1INTEVEP, S.A., Apdo. 76343, Caracas, 1070A, Venezuela

Journal of Colloid and Interface Science
|October 30, 1998
PubMed
Summary

Researchers synthesized molybdenum colloidal particles using thermal and sonochemical methods. The sonochemical approach rapidly produced smaller molybdenum sulfide (MoS2) particles with controlled sizes.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Colloidal molybdenum particles are of interest for various applications.
  • Efficient synthesis methods are needed for controlled particle size and composition.

Purpose of the Study:

  • To synthesize and characterize molybdenum colloidal particles.
  • To compare thermal and sonochemical synthesis methods.
  • To evaluate different metal precursors and reaction conditions.

Main Methods:

  • Synthesis using molybdenum hexacarbonyl (Mo(CO)6) and ammonium tetrathiomolybdate ((NH4)2MoS4) precursors.
  • Thermal and sonochemical synthesis techniques.
  • Characterization via elemental analysis, UV-Vis, FTIR, XPS, and Transmission Electron Microscopy (TEM).

Main Results:

  • Molybdenum oxide (MoO3) nanoparticles (1.5 nm) synthesized from Mo(CO)6.
  • Molybdenum sulfide (MoS2) nanoparticles synthesized from (NH4)2MoS4.
  • Sonochemical method yielded smaller MoS2 particles (2.5 nm) compared to thermal (4.7 nm).

Conclusions:

  • Sonochemical synthesis is a fast and convenient method for producing small colloidal molybdenum particles.
  • Control over particle size and composition is achievable.
  • Sonochemistry offers advantages for low-temperature synthesis of nanomaterials.