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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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Potential Due to a Magnetized Object01:24

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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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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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Magnetism01:30

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Magnetic Damping01:17

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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.
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Diamagnetism01:26

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
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Ferromagnetic soft continuum robots.

Yoonho Kim1, German A Parada1,2, Shengduo Liu1

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science Robotics
|November 2, 2020
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Summary
This summary is machine-generated.

Researchers developed tiny, steerable soft robots using magnetic actuation and hydrogel skin. These self-lubricating robots navigate complex spaces, enabling new possibilities for minimally invasive medical procedures.

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Area of Science:

  • Robotics
  • Materials Science
  • Biomedical Engineering

Background:

  • Existing continuum robots face miniaturization and friction challenges, limiting their medical applications.
  • Conventional actuation methods (e.g., wires, pneumatics, rigid magnets) hinder the development of smaller, more effective soft robots.
  • Navigation in constrained environments, like blood vessels, remains a significant hurdle for current robotic technologies.

Purpose of the Study:

  • To present a submillimeter-scale, self-lubricating soft continuum robot with omnidirectional steering and navigation.
  • To overcome miniaturization and friction limitations in soft continuum robotics.
  • To demonstrate the potential of these robots in complex medical environments and for targeted therapies.

Main Methods:

  • Fabrication of a soft continuum robot body from a polymer matrix with dispersed ferromagnetic microparticles.
  • Programming ferromagnetic domains within the robot's body for magnetic actuation.
  • Growing a hydrogel skin on the robot's surface to reduce friction and enable self-lubrication.
  • Integration of a functional core for steerable laser delivery.

Main Results:

  • Development of a submillimeter-scale soft continuum robot with diameters below a few hundred micrometers.
  • Demonstrated over 10-fold reduction in friction due to the hydrogel skin.
  • Successful navigation through a complex cerebrovascular phantom with multiple aneurysms.
  • Proof-of-concept for steerable laser delivery through the robot's functional core.

Conclusions:

  • The developed ferromagnetic soft continuum robots offer compact, self-contained actuation and intuitive manipulation.
  • These robots demonstrate significant potential for minimally invasive robotic surgery in previously inaccessible anatomical regions.
  • The technology addresses unmet needs in healthcare by enabling new approaches to treating complex lesions.