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Related Concept Videos

Coagulation01:06

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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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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...
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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...
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...
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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...
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...

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Nanosponge Tunability in Size and Crosslinking Density
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Restructuring of colloidal cakes during dewatering.

J B Madeline1, M Meireles, C Bourgerette

  • 1Laboratoire de Génie Chimique, CNRS UMR 5503, 118 route de Narbonne, 31062 Toulouse cedex 4, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 7, 2007
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Colloidal particle networks resist compression differently based on bond strength. Understanding these restructuring stages is key to controlling dewatering processes for silica particle suspensions.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Chemical Engineering

Background:

  • Aqueous suspensions of aggregated silica particles form macroscopic networks upon dewatering.
  • These wet cakes can be compressed using osmotic pressure, with varying resistance observed.
  • Understanding particle reorganization during compression is crucial for optimizing separation processes.

Purpose of the Study:

  • To investigate the particle reorganization processes during the compression of dewatered silica particle cakes.
  • To elucidate the relationship between interparticle bond strength and the resistance to compression.
  • To identify the distinct stages of cake collapse and network restructuring.

Main Methods:

  • Small-angle neutron scattering (SANS) to probe structure at various length scales.
  • Transmission electron microscopy (TEM) for high-resolution imaging of particle arrangements.
  • Numerical modeling of colloidal networks with interparticle forces simulated by surface springs.

Main Results:

  • Compression of silica particle cakes follows a three-stage restructuring process: void compression, void collapse forming dense regions, and formation of a rigid skeleton.
  • The nature of interparticle bonds significantly influences the compression behavior, with some networks spontaneously reaching the final stage.
  • Networks with bonds that break upon stretching exhibit plastic deformation, while those with stretchable bonds show elastic compression.

Conclusions:

  • The mechanical response and restructuring of colloidal particle cakes are strongly dependent on the properties of interparticle bonds.
  • Fragile or breakable bonds facilitate rapid collapse and network stiffening, while elastic bonds lead to gradual compression.
  • The findings provide insights into controlling solid-liquid separation in colloidal systems through tailored interparticle interactions.