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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.3K
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.
A magnetic field is defined by the force that a charged particle experiences...
7.3K
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

5.8K
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
5.8K
Magnetic Field Lines01:19

Magnetic Field Lines

5.7K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
5.7K
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

2.7K
If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
2.7K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.3K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
6.3K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.6K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
11.6K

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Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers
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Micro-/Nanorobots Propelled by Oscillating Magnetic Fields.

Hao Yu1, Wentian Tang2, Guanyu Mu3

  • 1State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China. yu1997hao@gmail.com.

Micromachines
|February 5, 2019
PubMed
Summary
This summary is machine-generated.

Magnetic micro-/nanorobots offer promising solutions for drug delivery and biosensing. This review details fabrication techniques and propulsion mechanisms for oscillating magnetic field-driven micro-/nanorobots.

Keywords:
fabrication techniquesmicro-/nanorobotsoscillating magnetic fieldspropulsion mechanisms

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Area of Science:

  • * Nanotechnology and Microfabrication
  • * Biomedical Engineering
  • * Materials Science

Background:

  • * Advances in micro- and nanomanufacturing have enabled the development of powerful micro-/nanorobots.
  • * Magnetic micro-/nanorobots are advantageous for applications like drug delivery, biosensing, bioimaging, and environmental remediation due to their controlled motion, longevity, and biocompatibility.
  • * Magnetic fields, either rotating or oscillating, are used to power these micro-/nanorobots.

Purpose of the Study:

  • * To review recent advancements in fabrication techniques for oscillating magnetic field-propelled micro-/nanorobots.
  • * To discuss the motion mechanisms of these micro-/nanorobots.
  • * To provide a comparative overview of different micro-/nanorobot designs and their capabilities.

Main Methods:

  • * Fabrication techniques discussed include electrodeposition, self-assembly, electron beam evaporation, and 3D direct laser writing.
  • * Propulsion mechanisms analyzed are wagging propulsion, surface walker propulsion, and scallop propulsion.
  • * A summary table compares the performance of various micro-/nanorobots driven by oscillating magnetic fields.

Main Results:

  • * Several fabrication methods are suitable for creating micro-/nanorobots for oscillating magnetic fields.
  • * Different propulsion mechanisms (wagging, surface walker, scallop) enable distinct modes of movement.
  • * The review provides a comparative analysis of the capabilities of these micro-/nanorobots.

Conclusions:

  • * Oscillating magnetic field-propelled micro-/nanorobots are a promising technology for future biomedical applications.
  • * Continued innovation in fabrication and propulsion will enhance their utility.
  • * These micro-/nanorobots represent a significant step towards advanced in-vivo and in-vitro applications.