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Related Concept Videos

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...
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 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...
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...
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...

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Fragmenting Bulk Hydrogels and Processing into Granular Hydrogels for Biomedical Applications
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Published on: May 17, 2022

Collapsing granular suspensions.

D Kadau1, J S Andrade, H J Herrmann

  • 1IfB, HIF E12, ETH Hönggerberg, 8093 Zürich, Switzerland. dkadau@ethz.ch

The European Physical Journal. E, Soft Matter
|October 13, 2009
PubMed
Summary
This summary is machine-generated.

A new 2D contact dynamics model accurately describes collapsing soil and suspension systems. Its shear strength behavior closely matches real-world data from natural collapsing soils.

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Area of Science:

  • Geotechnical Engineering
  • Soil Mechanics
  • Physics of granular materials

Background:

  • Collapsing soils pose significant geohazards.
  • Understanding the microscopic dynamics of soil collapse is crucial for predicting and mitigating risks.
  • Existing models may not fully capture the complex physical processes involved.

Purpose of the Study:

  • To develop a microscopic 2D contact dynamics model for collapsing soil and suspension systems.
  • To simulate the generation and collapse dynamics.
  • To validate the model against in situ measurements.

Main Methods:

  • Development of a 2D contact dynamics model.
  • Simulation of collapsing soil/suspension behavior.
  • Comparison with in situ data from natural collapsing soil.

Main Results:

  • The proposed model captures essential physical processes of collapse.
  • The model's shear strength behavior closely mirrors that of natural collapsing soil.
  • Model accuracy is demonstrated for both unperturbed and perturbed material phases.

Conclusions:

  • The 2D contact dynamics model provides a robust microscopic description of collapsing soil systems.
  • The model's ability to replicate shear strength behavior validates its physical relevance.
  • This approach offers a promising tool for analyzing soil collapse phenomena.