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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

8.1K
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...
8.1K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.9K
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...
1.9K
Ferromagnetism01:31

Ferromagnetism

3.6K
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...
3.6K
Magnetic Damping01:17

Magnetic Damping

1.3K
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...
1.3K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.9K
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...
2.9K
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

6.9K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
6.9K

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Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release
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Magnetic field switchable dry adhesives.

Jeffrey Krahn1, Enrico Bovero, Carlo Menon

  • 1MENRVA Research Group, School of Engineering Science, Simon Fraser University , Burnaby, British Columbia V5A 1S6, Canada.

ACS Applied Materials & Interfaces
|January 16, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel magnetic field controllable dry adhesive. Adhesion force can be tuned by magnetic fields, with decreases observed during preloading and variable effects during pull-off.

Keywords:
biomimeticdry adhesiveforcemagneticmushroom capspolymer

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Area of Science:

  • Materials Science
  • Robotics
  • Adhesion Science

Background:

  • Dry adhesives mimic gecko feet for reversible adhesion.
  • Controlling adhesion force dynamically is crucial for advanced applications.
  • Existing dry adhesives often lack tunable properties.

Purpose of the Study:

  • To develop a dry adhesive whose adhesion force is controllable via an external magnetic field.
  • To investigate the effect of magnetic field application timing on adhesion performance.
  • To understand the relationship between magnetic field direction and adhesion modulation.

Main Methods:

  • Fabrication of a novel magnetic field controllable dry adhesive device.
  • Standardized normal adhesion force testing protocols.
  • Application of magnetic fields during different phases of the adhesion test cycle (preloading and pull-off).

Main Results:

  • A decrease in normal adhesion force was observed when a magnetic field was applied throughout the entire test cycle.
  • Applying a magnetic field during the preload phase increased the device's stiffness, leading to reduced adhesion.
  • Applying a magnetic field solely during the pull-off phase resulted in either an increase or decrease in adhesion, dependent on field direction.

Conclusions:

  • The developed dry adhesive offers tunable adhesion properties controlled by magnetic fields.
  • The timing and direction of the magnetic field significantly influence the adhesion force and stiffness.
  • This technology has potential applications in robotics, manufacturing, and adaptable gripping systems.