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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Magnetic Force01:18

Magnetic Force

In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
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...

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Related Experiment Video

Updated: May 30, 2026

Magnetic and Thermal-sensitive Poly(N-isopropylacrylamide)-based Microgels for Magnetically Triggered Controlled Release
08:39

Magnetic and Thermal-sensitive Poly(N-isopropylacrylamide)-based Microgels for Magnetically Triggered Controlled Release

Published on: July 4, 2017

Magnetically responsive pickering foams.

Stephanie Lam1, Elena Blanco, Stoyan K Smoukov

  • 1Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, 27695-7905, United States.

Journal of the American Chemical Society
|August 10, 2011
PubMed
Summary
This summary is machine-generated.

We developed magnetic Pickering foams that are stable until a magnetic field is applied, allowing for controlled foam collapse. This innovation offers new ways to study foam properties and enables noncontact defoaming applications.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Pickering foams, stabilized by solid particles, are known for their stability.
  • Controlling foam properties, such as destruction, remains a challenge in many applications.

Purpose of the Study:

  • To introduce a novel class of Pickering foams manipulated by an external magnetic field.
  • To investigate the stability and controlled collapse mechanisms of these magnetic foams.

Main Methods:

  • Foams were stabilized using a mixture of magnetic and nonmagnetic particles.
  • Foam stability was assessed by measuring water drainage over time.
  • Collapse behavior under a magnetic field was correlated with liquid fraction and magnetic particle concentration.

Main Results:

  • The magnetic Pickering foams demonstrated high stability in the absence of a magnetic field.
  • Application of a threshold magnetic field induced rapid foam destruction.
  • Foam collapse was dependent on liquid fraction and magnetic particle concentration.

Conclusions:

  • A new class of magnetically tunable Pickering foams has been successfully developed.
  • This system provides a method for on-demand foam destabilization.
  • Potential applications include noncontact defoaming processes and fundamental studies of foam dynamics.