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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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...
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Racemic Mixtures and the Resolution of Enantiomers02:30

Racemic Mixtures and the Resolution of Enantiomers

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Related Experiment Video

Updated: Jun 5, 2026

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Enhanced shear separation for chiral magnetic colloidal aggregates.

C I Mendoza1, C M Marques, F Thalmann

  • 1Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apdo. Postal 70-360, 04510 México, Distrito Federal, Mexico.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2011
PubMed
Summary

This study reveals how simple colloidal propellers, made of four spheres, use magnetic fields and shear flow to move. These micro-propellers can be controlled for directed motion in microfluidic devices.

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Ensemble Force Spectroscopy by Shear Forces
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Last Updated: Jun 5, 2026

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

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Published on: February 5, 2022

Ensemble Force Spectroscopy by Shear Forces
07:30

Ensemble Force Spectroscopy by Shear Forces

Published on: July 26, 2022

Area of Science:

  • Colloidal science
  • Microfluidics
  • Soft matter physics

Background:

  • Colloidal systems offer unique properties for micro-scale applications.
  • Designing micro-scale machines requires understanding complex fluid dynamics and particle interactions.

Purpose of the Study:

  • To investigate the design principles of the simplest colloidal propeller.
  • To understand how a cluster of spheres can achieve controlled drift motion.

Main Methods:

  • Utilizing superparamagnetic beads to create colloidal propellers.
  • Applying a simultaneous magnetic field and shear flow.
  • Analyzing the migration velocity based on cluster geometry.

Main Results:

  • The colloidal propeller architecture couples translation with rotation for directed motion.
  • Simultaneous magnetic field and shear flow induce migration in the vorticity direction.
  • Migration velocity is dependent on the geometrical parameters of the cluster.

Conclusions:

  • Significant cluster separation is achievable under typical microfluidic conditions.
  • The findings provide insights into designing efficient micro-scale colloidal machines.
  • This work advances the controlled manipulation of micro-scale particles.