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Related Concept Videos

Colloids03:22

Colloids

17.6K
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

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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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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Coagulation01:06

Coagulation

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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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First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

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Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
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First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

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Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Field-driven cluster formation in two-dimensional colloidal binary mixtures.

Dingwen Qian1, Monica Olvera de la Cruz2

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

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|May 18, 2023
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Summary
This summary is machine-generated.

Driven colloids with distinct particle sizes and charges form clusters and stable wave packets above a critical electric field strength. This study reveals pattern formation in complex colloidal systems under external forces.

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Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Non-equilibrium Systems

Background:

  • Colloidal systems exhibit complex behaviors when subjected to external forces.
  • Understanding particle dynamics in asymmetric charged colloids is crucial for materials science.

Purpose of the Study:

  • To investigate cluster formation in size- and charge-asymmetric colloids under an electric field.
  • To analyze the relationship between driving force, particle motion, and emergent patterns.

Main Methods:

  • Simulating oppositely charged colloids with varying sizes.
  • Applying an external electric field to drive the system.
  • Analyzing particle trajectories and vibrational modes.

Main Results:

  • Observed cluster formation in the colloidal system above a critical electric field threshold.
  • Identified stable wave packets in the vibrational motions of larger particles during clustering.
  • Demonstrated fluidlike motion of smaller particles within the forming clusters.

Conclusions:

  • External electric fields can induce pattern formation, specifically clustering, in asymmetric colloidal systems.
  • The interplay between particle size, charge, and driving force dictates emergent collective behaviors.
  • Stable wave packets are associated with the vibrational dynamics of the network structure during phase transitions.