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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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The Nucleosome Core Particle02:10

The Nucleosome Core Particle

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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
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The Nucleosome Core Particle01:12

The Nucleosome Core Particle

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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
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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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Detection of Gross Error: The Q Test01:00

Detection of Gross Error: The Q Test

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When one or more data points appear far from the rest of the data, there is a need to determine whether they are outliers and whether they should be eliminated from the data set to ensure an accurate representation of the measured value. In many cases, outliers arise from gross errors (or human errors) and do not accurately reflect the underlying phenomenon. In some cases, however, these apparent outliers reflect true phenomenological differences. In these cases, we can use statistical methods...
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Related Experiment Video

Updated: Feb 6, 2026

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Detection and tracking of anisotropic core-shell colloids.

J Roller1, P Pfleiderer2, J-M Meijer2

  • 1Department of Chemistry, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 25, 2018
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This study presents a new 3D imaging technique for tracking the movement and rotation of anisotropic colloidal particles. The method accurately identifies particle positions and orientations in both dilute and dense systems.

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Area of Science:

  • Colloidal science
  • Materials science
  • Optical microscopy

Background:

  • Three-dimensional (3D) optical microscopy is crucial for studying colloidal systems.
  • Observing shape-anisotropic particles, which have rotational degrees of freedom beyond translation, is an emerging area of interest.
  • Existing methods are well-established for spherical particles but less so for anisotropic ones.

Purpose of the Study:

  • To introduce a novel 3D technique for determining the position and orientation of anisotropic particles.
  • To develop an advanced particle tracking algorithm accounting for both translational and rotational motion.
  • To demonstrate the algorithm's applicability to core-shell particles with arbitrary shell shapes.

Main Methods:

  • Development of a novel algorithm for 3D position and orientation detection of core-shell anisotropic particles.
  • Application and testing of the algorithm on polymethyl methacrylate (PMMA) core-shell ellipsoids.
  • Validation using both artificial images and experimental data from dilute and dense colloidal systems.

Main Results:

  • Accurate identification of particle positions with subpixel precision.
  • High angular precision in determining particle orientations.
  • Successful demonstration on large, dense colloidal systems with thousands of particles.

Conclusions:

  • The developed 3D detection and tracking technique reliably determines the position and orientation of anisotropic particles.
  • The method is suitable for analyzing complex, large-scale colloidal systems.
  • This advancement facilitates the study of dynamics in shape-anisotropic colloidal systems.