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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.4K
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...
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.3K
Magnetic Field Lines01:19

Magnetic Field Lines

5.9K
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:
5.9K
Magnetic Vector Potential01:15

Magnetic Vector Potential

1.6K
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...
1.6K
Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

7.2K
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...
7.2K

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Assembling particle clusters with incoherent 3D magnetic fields.

Rasam Soheilian1, Hamed Abdi1, Craig E Maloney1

  • 1Northeastern University, Department of Mechanical and Industrial Engineering, Boston, MA, USA.

Journal of Colloid and Interface Science
|November 25, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed new 3D magnetic fields to precisely control particle assembly. This method enables tunable, stable colloidal clusters for applications in drug delivery and microfluidics.

Keywords:
ColloidsDirected assemblyIncoherent fieldsMagnetic assembly

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Area of Science:

  • Colloidal science
  • Soft matter physics
  • Nanotechnology

Background:

  • Directed assembly of particle suspensions is crucial for applications like rheological control, drug delivery, and active colloidal devices.
  • Controlling the assembly and dissolution of monodisperse particle clusters presents a significant optimization challenge.
  • Current magnetic field control methods primarily focus on in-phase coherent fields.

Purpose of the Study:

  • To investigate a novel family of incoherent three-dimensional (3D) magnetic fields for directed particle assembly.
  • To demonstrate the capability of these fields in creating tunable and stable particle assemblies (dimers, trimers, quadramers).
  • To explore the potential of these fields in manipulating colloidal suspensions.

Main Methods:

  • Utilizing a family of incoherent 3D magnetic fields to drive particle assembly.
  • Tuning field functions to achieve specific cluster formations (dimers, trimers, quadramers).
  • Assessing the stability and dynamic switching capabilities of the assembled clusters.

Main Results:

  • Demonstrated the creation of controlled and tunable particle assemblies, including dimers, trimers, and quadramers.
  • Showcased the ability to achieve long-term stability of monodisperse clusters.
  • Confirmed the capacity to rapidly switch clusters between different configurations.
  • Highlighted the extensive phase space offered by these 3D field functions for colloidal manipulation.

Conclusions:

  • Incoherent 3D magnetic fields offer a powerful and versatile approach to directed colloidal assembly.
  • This method provides precise control over particle cluster formation, stability, and dynamics.
  • The findings open new avenues for advanced applications in microfluidics, smart materials, and targeted drug delivery.