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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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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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Harmonic Mean01:09

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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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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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Simple Harmonic Motion01:21

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Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Complex structures generated by competing interactions in harmonically confined colloidal suspensions.

E O Lima1, P C N Pereira1, H Löwen2

  • 1Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 6, 2018
PubMed
Summary
This summary is machine-generated.

Colloidal particles self-assemble into diverse structures like disks and rods using a unique

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Area of Science:

  • Soft Matter Physics
  • Computational Physics
  • Materials Science

Background:

  • Colloidal systems are fundamental in materials science.
  • Understanding particle interactions is key to controlling self-assembly.
  • The 'mermaid' potential offers a unique interaction profile.

Purpose of the Study:

  • To investigate the structural properties of colloidal systems.
  • To explore self-assembly patterns driven by a specific interaction potential.
  • To analyze the formation of quasi-2D structures.

Main Methods:

  • Langevin dynamics simulations.
  • Analysis of equilibrium configurations.
  • Varying parameters of the isotropic pair potential.

Main Results:

  • Particles self-assemble into complex structures: compact disks, fringed disks, rods, and spherical clusters.
  • Quasi-two-dimensional (2D) structures were identified for specific potential parameters.
  • These quasi-2D structures exhibit stability relevant to 2D systems.

Conclusions:

  • The 'mermaid' potential effectively drives self-assembly in confined colloidal systems.
  • Complex and ordered structures emerge from simple interaction rules.
  • The study reveals potential for creating stable 2D-like structures from 3D systems.