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Related Concept Videos

Other Unique Bacteria01:18

Other Unique Bacteria

Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Diamagnetism01:26

Diamagnetism

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.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.

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Related Experiment Video

Updated: May 17, 2026

Preparation and 3D Tracking of Catalytic Swimming Devices
06:50

Preparation and 3D Tracking of Catalytic Swimming Devices

Published on: July 1, 2016

Magnetotactic artificial self-propelled nanojets.

Guanjia Zhao1, Martin Pumera

  • 1Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 20, 2012
PubMed
Summary
This summary is machine-generated.

Catalytic nanojets with a nickel segment become permanent magnets, enabling them to self-orient and move in response to external magnetic fields, mimicking magnetotactic bacteria.

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Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers
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Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers
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Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers

Published on: April 26, 2019

Area of Science:

  • Nanotechnology
  • Materials Science
  • Biophysics

Background:

  • Self-propelled catalytic nanotubes (nanojets) offer potential for autonomous tasks.
  • Controlling nanojet motion is crucial for advanced applications.

Purpose of the Study:

  • To engineer nanojets with intrinsic magnetic properties for controlled propulsion.
  • To investigate the magnetic domain orientation and its effect on nanojet behavior.

Main Methods:

  • Fabrication of gold/nickel/platinum (Au/Ni/Pt) nanotubes.
  • Induction of permanent magnetization in the nickel segment.
  • Observation of nanojet self-orientation and propulsion in external magnetic fields.

Main Results:

  • Successfully created magnetized nanojets with Ni segments exhibiting permanent magnetic domains along the tube axis.
  • Demonstrated that nanojets orient and propel themselves towards or away from magnetic field sources.
  • Observed behavior analogous to magnetotactic bacteria.

Conclusions:

  • Magnetized nanojets can autonomously navigate using external magnetic fields.
  • This magnetic guidance capability significantly enhances the potential of self-propelled nanojets for various applications.