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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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Related Experiment Video

Updated: May 24, 2026

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

The transition strength from solid to liquid colloidal dipolar clusters in precessing magnetic fields.

A Ray1, Th M Fischer

  • 1Institut für Experimentalphysik, Universität Bayreuth, Germany.

The European Physical Journal. E, Soft Matter
|March 9, 2012
PubMed
Summary

Colloidal clusters in ferrofluids exhibit controlled rotation and stability transitions influenced by magnetic fields. Cluster shape and core size dictate whether transitions are first-order, affecting rotation speed and hysteresis.

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Last Updated: May 24, 2026

Spatial Separation of Molecular Conformers and Clusters
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
12:37

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Published on: September 4, 2015

Area of Science:

  • Colloid science
  • Soft matter physics
  • Magnetohydrodynamics

Background:

  • Colloidal clusters are fundamental building blocks in soft matter.
  • Ferrofluids exhibit unique responses to external magnetic fields.
  • Understanding cluster dynamics is crucial for materials science applications.

Purpose of the Study:

  • To investigate the rotational dynamics of colloidal clusters in ferrofluids.
  • To determine the role of precession angle and cluster shape on stability.
  • To analyze the nature of cluster transitions (weakly vs. strongly first-order).

Main Methods:

  • Experimental observation of colloidal cluster rotation in a precessing magnetic field.
  • Utilizing mixtures of paramagnetic and diamagnetic beads.
  • Analyzing cluster stability based on precession angle and depolarization fields.

Main Results:

  • Cluster stability is governed by the precession angle, with instability occurring at the magic angle.
  • Depolarization fields cause local precession angles to deviate from the external field.
  • Cluster transitions can be weakly or strongly first-order, impacting rotation speed and hysteresis.

Conclusions:

  • The precession angle acts as a control parameter for colloidal cluster stability.
  • Cluster shape and core size influence the order and characteristics of transitions.
  • Weakly first-order transitions exhibit critical speeding up, while strongly first-order transitions show hysteresis.