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Related Concept Videos

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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Colloids and Suspensions01:17

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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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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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Aggregates Classification01:29

Aggregates Classification

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Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...
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Dynamic Equilibrium02:20

Dynamic Equilibrium

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Additional Subnuclear Structures

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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Dynamics and structure of colloidal aggregates under microchannel flow.

Ming Han1, Jonathan K Whitmer2, Erik Luijten3

  • 1Graduate Program in Applied Physics, Northwestern University, Evanston, Illinois 60208, USA.

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|January 12, 2019
PubMed
Summary

Colloidal gels in confined spaces exhibit unique behaviors under varying shear. High shear melts clusters, while moderate shear promotes crystallization, with complex dynamics in between.

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Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Colloidal gels are crucial in biological systems and 3D printing.
  • Understanding gel behavior under non-uniform shear is vital for microfluidic applications.
  • Existing research primarily focuses on uniform shear effects.

Purpose of the Study:

  • To investigate the phase behavior and dynamics of attractive colloidal systems under microchannel flow.
  • To explore the impact of non-uniform shear on colloidal gel structures.
  • To uncover novel aggregation and dynamics under confinement.

Main Methods:

  • Mesoscale particle-based hydrodynamic simulations were employed.
  • Attractive colloids were subjected to microchannel flow conditions.
  • Phase behavior and dynamics were analyzed across different shear strengths.

Main Results:

  • Moderate shear induced shear-assisted crystallization.
  • High shear strengths led to the melting of colloidal clusters.
  • A transition region revealed cyclic dynamics: surface melting, thread breakup, and reformation into crystallites.

Conclusions:

  • Non-uniform shear significantly influences colloidal gel kinetics and phase behavior.
  • Cyclic dynamics involving surface melting and breakup/reformation offer control over crystallite formation.
  • These findings provide new avenues for controlling colloidal aggregation in confined environments.