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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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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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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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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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Magnetic Declination01:19

Magnetic Declination

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Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
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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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Ultra-extensible ribbon-like magnetic microswarm.

Jiangfan Yu1, Ben Wang1,2, Xingzhou Du1,2,3

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Researchers created self-organizing, ribbon-like microswarms from paramagnetic nanoparticles using magnetic fields. These microswarms exhibit controlled elongation, splitting, merging, and navigation through confined spaces, demonstrating stable collective behavior.

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Area of Science:

  • Soft Matter Physics
  • Robotics
  • Materials Science

Background:

  • Animal collective behaviors, like flocks and swarms, arise from local interactions of many individuals.
  • Robotic systems can mimic natural swarms using algorithms and wireless communication.
  • Developing microscale swarming robots with collective behaviors is challenging.

Purpose of the Study:

  • To develop a strategy for reconfiguring paramagnetic nanoparticles into functional microswarms.
  • To analyze the mechanisms governing microswarm self-organization.
  • To investigate the navigation and stability of microswarms in confined environments.

Main Methods:

  • Utilizing oscillating magnetic fields to reconfigure paramagnetic nanoparticles into ribbon-like swarms.
  • Tuning magnetic field parameters to control swarm dynamics (elongation, splitting, merging).
  • Observing microswarm behavior near solid boundaries and within channel networks.

Main Results:

  • Paramagnetic nanoparticles were successfully reconfigured into dynamic, ribbon-like microswarms.
  • Microswarms demonstrated reversible elongation to high aspect ratios, splitting, and merging.
  • The colloidal microswarms navigated confined channels to multiple targets with high access rates and pattern stability.

Conclusions:

  • Oscillating magnetic fields provide a viable method for creating and controlling self-organized microswarms.
  • These microswarms exhibit complex collective behaviors and controlled navigation capabilities.
  • The findings offer a pathway toward advanced micro-robotic systems for various applications.