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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

1.0K
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...
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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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...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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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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Magnetic Force01:18

Magnetic Force

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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...
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Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Laser Micromachining for Polymer Surface Topography Design
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Vector-stimuli-responsive magnetorheological fibrous materials.

Junhong Pu1,2, Haiqiong Li3,4, Jin Liu3,4

  • 1Research Institute for Intelligent Wearable Systems, The Hong Kong Polytechnic University, Hong Kong, China. junhong.pu@polyu.edu.hk.

Nature
|November 5, 2025
PubMed
Summary

Researchers developed novel magnetorheological fibers that enable directional control of smart textiles. These advanced fibrous materials offer customizable actuation and stiffening for innovative applications in wearables and soft robotics.

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Area of Science:

  • Materials Science
  • Textile Engineering
  • Robotics

Background:

  • Stimuli-responsive fibrous materials are crucial for smart textiles, soft robotics, and wearables.
  • Existing materials often lack directional control and functional diversity in response to stimuli like voltage or temperature.

Purpose of the Study:

  • To engineer vector-stimuli-responsive magnetorheological fibrous materials with directional controllability.
  • To develop customizable fabrics with advanced actuation and stiffening functionalities.

Main Methods:

  • Developed an engineering model integrating textile mechanics and soft magnetic material properties.
  • Mass-produced soft magnetic polymer composite fibers with optimized properties.
  • Assembled fibers into concentric helical yarns for fabric creation.

Main Results:

  • Demonstrated that yarns exhibit controlled bending and stiffening based on magnetic field direction and magnitude.
  • Created smart textiles with functionalities including active ventilation, conformable grippers, and haptic feedback gloves.
  • Achieved sophisticated vector control for stimuli-responsive fibrous materials.

Conclusions:

  • Introduced a new class of magnetorheological fibrous materials for smart textiles.
  • Enabled precise, directional control of fabric properties using magnetic fields.
  • Paved the way for advanced smart textile innovations in wearables and robotics.