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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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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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Magnetic Field due to Moving Charges01:23

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Colloids03:22

Colloids

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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 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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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Colloidal precipitates01:09

Colloidal precipitates

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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Two-dimensional magnetic colloids under shear.

Tomaž Mohorič1, Jure Dobnikar, Jürgen Horbach

  • 1International Research Centre for Soft Matter, Beijing University of Chemical Technology, Beijing 100029, P. R. China. jd489@cam.ac.uk.

Soft Matter
|February 16, 2016
PubMed
Summary
This summary is machine-generated.

Soft disordered solids exhibit complex rheological properties. This study reveals distinct mechanical responses in superparamagnetic colloids, detailing plastic flow, network stretching, and failure mechanisms under shear.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Rheology

Background:

  • Soft disordered solids, like colloidal gels, have complex rheological properties crucial for applications.
  • Microscopic mechanisms governing their response to mechanical loading remain poorly understood.

Purpose of the Study:

  • To elucidate microscopic mechanisms of mechanical response in soft disordered solids.
  • To investigate the influence of structural changes on material behavior under shear.

Main Methods:

  • Studied a model system of two-dimensional superparamagnetic colloids in a precessing magnetic field.
  • Tuned system structure from hexagonal crystal to disordered gel by varying magnetic field angle (θ).
  • Performed Langevin dynamics simulations under constant shear rate.

Main Results:

  • Observed three distinct material responses: plastic flow via dislocation defects in crystals (θ = 0°).
  • Gel networks (θ = 48°) evolved into homogeneously stretched networks via bond rearrangement and shear banding.
  • High shear (θ = 50°) induced phase separation and network failure into clusters and chains.

Conclusions:

  • Simulations provide microscopic insights into strain localization and failure mechanisms in gel-like networks.
  • Demonstrated that shear can generate novel stretched network structures.
  • Highlighted the tunability of material response by controlling colloidal structure.