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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

Bijels containing magnetic particles: a simulation study.

Eunhye Kim1, Kevin Stratford, Michael E Cates

  • 1SUPA, School of Physics and Astronomy, University of Edinburgh, JCMB, The Kings Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 17, 2010
PubMed
Summary
This summary is machine-generated.

Magnetic colloids in emulsion gels (bijels) offer potential structural control via magnetic fields. Field gradients may enable controlled breakdown of these soft materials.

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Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Materials Science

Background:

  • Bicontinuous, interfacially jammed emulsion gels (bijels) are soft solids with interpenetrating fluid domains stabilized by colloidal monolayers.
  • Bijels form via arrested spinodal decomposition from colloidal suspensions.

Purpose of the Study:

  • To investigate the effects of magnetic colloids on bijel structure using lattice Boltzmann simulations.
  • To explore magnetic field and field gradient control over bijel formation and stability.

Main Methods:

  • Lattice Boltzmann simulations were employed.
  • The study considered the influence of magnetic fields and field gradients on magnetic colloid-stabilized bijels.

Main Results:

  • Modest structural effects were observed with typical magnetic nanoparticle parameters.
  • Significantly larger magnetic particles could yield more pronounced effects.
  • Field gradients show potential for controlled breakdown of bijels, analogous to droplet emulsions.

Conclusions:

  • Magnetic colloids offer a pathway for external control over bijel structures.
  • Field gradients present a promising method for the controlled disassembly of bijels.