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Related Concept Videos

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...
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Shape and Texture of Coarse Aggregate

Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
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...
Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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Gravimetry: Inorganic And Organic Precipitating Agents00:49

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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...

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Particle interactions in kaolinite suspensions and corresponding aggregate structures.

Vishal Gupta1, Marc A Hampton, Jason R Stokes

  • 1Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112, USA. Vishal.Gupta@utah.edu

Journal of Colloid and Interface Science
|April 15, 2011
PubMed
Summary
This summary is machine-generated.

Kaolinite particle aggregation depends on pH-driven surface charges. At low pH, silica-alumina face interactions dominate, promoting aggregation, while high pH leads to dispersion and stable suspensions.

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Area of Science:

  • Geochemistry
  • Colloid Science
  • Materials Science

Background:

  • Kaolinite particles exhibit distinct surface charge densities on their silica and alumina faces.
  • These surface charges are pH-dependent, influencing particle interactions and aggregation behavior.
  • Understanding these interactions is crucial for controlling kaolinite suspension properties.

Purpose of the Study:

  • To investigate the role of surface charge densities on kaolinite particle interactions and aggregation.
  • To determine how pH affects the association between different kaolinite surfaces (face-face, edge-face, edge-edge).
  • To correlate particle association with suspension properties like shear-yield stress and stability.

Main Methods:

  • Utilized surface force measurements via atomic force microscopy to determine surface charge densities.
  • Analyzed interaction energies between different kaolinite surfaces based on measured charge densities.
  • Employed cryo-scanning electron microscopy (cryo-SEM) to visualize kaolinite aggregate structures.

Main Results:

  • Silica face is negatively charged at pH > 4; alumina face is positively charged at pH < 6 and negatively charged at pH > 8.
  • Silica face-alumina face interaction is dominant at low pH, leading to increased kaolinite layer stacking.
  • Maximum shear-yield stress observed at pH 5-5.5 due to enhanced face-face and edge-face associations; particles disperse at high pH.

Conclusions:

  • pH-dependent surface charges dictate kaolinite particle aggregation and dispersion.
  • Face-face and edge-face associations are key to aggregation at low to neutral pH.
  • At high pH, negative charges on all surfaces stabilize the kaolinite suspension.