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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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Numerical Calculations01:24

Numerical Calculations

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In engineering applications, the representation of the numerical value is critical. Presenting or reporting the answer is one of the essential parts of engineering practices. Numerical calculations are performed using handheld calculators or computers since numerically accurate answers are always preferred.
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Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Colloids and Suspensions01:17

Colloids and Suspensions

3.3K
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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Dense Connective Tissue01:13

Dense Connective Tissue

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Dense connective tissue contains more collagen fibers than loose connective tissue. As a consequence, it displays greater resistance to stretching. There are two major categories of dense connective tissue— regular and irregular.
Dense Regular Connective Tissue
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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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Synthesis and Characterization of Supramolecular Colloids
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Dynamics of dense hard sphere colloidal systems: A numerical analysis.

Paolo Sibani1, Carsten Svaneborg1

  • 1Department of Physics, Chemistry, and Pharmacy, University of Southern Denmark, Campusvej 55, DK5230, Odense M, Denmark.

Physical Review. E
|May 22, 2019
PubMed
Summary

Record Dynamics (RD) accurately models dense colloidal suspensions. This study confirms RD

Area of Science:

  • Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Dense colloidal suspensions exhibit complex dynamics.
  • Coarse-graining methods simplify complex systems.
  • Record Dynamics (RD) is a novel coarse-graining approach.

Purpose of the Study:

  • To test the applicability of Record Dynamics (RD) to dense hard sphere colloidal suspensions.
  • To validate RD's predictions against known simulation results.
  • To explore the underlying mechanisms of particle dynamics in these systems.

Main Methods:

  • Extensive molecular dynamics simulations.
  • Analysis of particle trajectories and energy.
  • Spatial partitioning of the system.
  • Statistical analysis of intermittent events ('quakes').

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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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Main Results:

  • Reproduced known logarithmic diffusion and energy decay.
  • Quantified cage size and identified cage-breaking events.
  • Demonstrated that 'quakes' follow a log-Poisson process within domains.
  • Showed 'quakes' are statistically independent and Poisson distributed.

Conclusions:

  • Record Dynamics (RD) is a valid and powerful tool for modeling dense hard sphere colloidal suspensions.
  • RD successfully explains intermittent particle dynamics and aging phenomena.
  • The study provides quantitative insights into cage dynamics and 'quakes'.