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Related Concept Videos

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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Magnetic Fields01:27

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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.
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Magnetism01:30

Magnetism

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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 Field due to Moving Charges01:23

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Magnetic Flux01:18

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The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
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Motion Of A Charged Particle In A Magnetic Field01:22

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A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
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Magnetic movement under the spotlight.

Larisa Florea1

  • 1School of Chemistry and AMBER, SFI Research Centre for Advanced Materials and BioEngineering Research, Trinity College Dublin, University of Dublin, College Green, Dublin 2, Ireland.

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|December 10, 2020
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This summary is machine-generated.

Programmable composite hydrogel robots demonstrate controlled movement using light and magnetic fields. This advancement enables precise locomotion for advanced robotic applications.

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Area of Science:

  • Robotics
  • Materials Science
  • Soft Matter Physics

Background:

  • Hydrogel-based robots offer unique advantages for soft robotics due to their biocompatibility and deformability.
  • Controlling the locomotion of hydrogel robots typically requires complex mechanisms or external stimuli.
  • Developing autonomous and programmable movement in hydrogel robots remains a significant challenge.

Purpose of the Study:

  • To engineer composite hydrogel robots capable of programmable locomotion.
  • To investigate the use of combined light and magnetic field stimuli for precise robot control.
  • To demonstrate versatile movement patterns for potential applications in micro-manipulation and targeted delivery.

Main Methods:

  • Fabrication of composite hydrogel materials incorporating magnetic nanoparticles and photoresponsive polymers.
  • Design of a system for applying external magnetic fields and light irradiation.
  • Characterization of robot deformation and locomotion in response to stimuli.
  • Programming distinct movement trajectories through controlled application of stimuli.

Main Results:

  • The composite hydrogel robots exhibited programmable locomotion when subjected to light and magnetic fields.
  • Precise control over direction, speed, and pattern of movement was achieved.
  • Demonstrated capabilities include crawling, rotating, and shape-changing locomotion.
  • The robots showed stable performance in aqueous environments.

Conclusions:

  • Composite hydrogel robots can be effectively controlled using a combination of light and magnetic fields.
  • This dual-stimuli approach offers a versatile platform for programmable locomotion in soft robots.
  • The developed technology holds promise for applications requiring untethered, precisely controlled soft robotic systems.