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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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Related Experiment Video

Updated: Jul 2, 2026

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

Field induced phase segregation in ferrofluids.

E S Kooij1, A C Gâlcă, B Poelsema

  • 1Solid State Physics group, MESA(+) Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands. e.s.kooij@utwente.nl

Journal of Colloid and Interface Science
|September 9, 2008
PubMed
Summary
This summary is machine-generated.

A modest magnetic field causes phase segregation in magnetite ferrofluids, creating a low-density, optically transparent phase. This phase forms a bubble-like structure when the field is removed, with its movement analyzed by buoyancy and drag forces.

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Last Updated: Jul 2, 2026

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Published on: September 4, 2015

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

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

Published on: February 5, 2022

Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Magnetite ferrofluids exhibit complex behaviors under external magnetic fields.
  • Understanding phase segregation is crucial for ferrofluid applications.

Purpose of the Study:

  • To investigate the phase segregation in magnetite ferrofluids induced by a weak magnetic field gradient.
  • To analyze the formation and dynamics of the resulting low-density phase.
  • To model the kinetics of the observed 'bubble'-like structures.

Main Methods:

  • Experimental observation of phase segregation in a glass cell.
  • Simulation of magnetic flux density using finite element methods.
  • Kinetic analysis of bubble formation using a model incorporating buoyancy and drag forces.

Main Results:

  • A low-density phase with higher optical transmission forms at the bottom of the cell under a magnetic field gradient (< 25 T/m).
  • This low-density phase transforms into a distinct 'bubble'-like feature upon removal of the magnetic field.
  • The kinetics of the bubble were successfully described by a model considering buoyancy and drag.

Conclusions:

  • External magnetic fields can induce significant phase segregation in magnetite ferrofluids even at low field strengths.
  • The observed bubble dynamics are governed by fundamental physical forces, allowing for predictive modeling.
  • This study provides insights into the controllable manipulation of ferrofluid structures.