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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...
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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.
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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.
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Magnetic Force01:18

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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.
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Magnetic Damping01:17

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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

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Laser Micromachining for Polymer Surface Topography Design
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Published on: September 19, 2025

Magnetic responsive polymer composite materials.

Julie Thévenot1, Hugo Oliveira, Olivier Sandre

  • 1Université de Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France.

Chemical Society Reviews
|May 3, 2013
PubMed
Summary
This summary is machine-generated.

This study explores magnetic responsive composite materials, detailing three classes based on deformation, magnetic guidance, and thermoresponsive actuation for diverse applications. These materials offer controlled, non-invasive remote operation for advanced technologies.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Magnetic responsive materials are crucial for advanced applications in biomedical, coatings, microfluidics, and microelectronics.
  • Combining magnetic and polymer materials creates composites with enhanced magnetic responsiveness.
  • Magnetic actuation offers precise spatial and temporal control for non-invasive remote operation.

Purpose of the Study:

  • To categorize magnetic responsive composite materials based on their activation modes and applications.
  • To present essential design parameters for fine-tuning the properties of these composites.
  • To highlight key examples and potential uses in various scientific fields.

Main Methods:

  • Classification of magnetic responsive composites into three distinct categories: deformation, magnetic guidance, and thermoresponsive actuation.
  • Analysis of design parameters influencing material properties for each category.
  • Review of existing literature and key examples illustrating the applications.

Main Results:

  • Identified three classes of magnetic responsive composites: deformation-based, magnetic guidance-based, and thermoresponsive actuation-based.
  • Detailed essential design parameters for tailoring composite properties.
  • Demonstrated the versatility of these materials for applications such as cell guidance, drug delivery, and shape memory devices.

Conclusions:

  • Magnetic responsive composites offer versatile solutions for remote, non-invasive control in various technological fields.
  • The three identified categories provide a framework for understanding and developing new magnetic responsive materials.
  • Further research into design parameters will unlock advanced applications in biomedicine, microelectronics, and beyond.