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Magnetic Fields

Magnetic Fields

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...

Magnetic Damping

Magnetic Damping

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.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...

Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

Magnetic Field Of A Current Loop

Magnetic Field Of A Current Loop

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.

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

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. This...

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Magnetic-, Acoustic-, and Optical-Triple-Responsive Microbubbles for Magnetic Hyperthermia and Pothotothermal Combination Cancer Therapy

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Reducing blood viscosity with magnetic fields.

R Tao¹, K Huang

¹Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA. rtao@temple.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|August 27, 2011

Summary

This summary is machine-generated.

High blood viscosity increases heart disease risk. Applying strong magnetic fields (1 T+) can significantly reduce blood viscosity, offering a new physical therapy approach without harming red blood cells.

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Quantifying Mixing using Magnetic Resonance Imaging

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Published on: January 25, 2012

Area of Science:

Biophysics
Cardiovascular Science
Medical Physics

Background:

Increased blood viscosity is a significant risk factor for cardiovascular diseases, including heart attacks.
Current treatments, like aspirin, have undesirable side effects.
Damage to blood vessels is associated with elevated blood viscosity.

Purpose of the Study:

To investigate the potential of magnetic fields in reducing blood viscosity.
To explore a non-pharmacological method for managing blood viscosity.
To assess the impact of magnetic field exposure on blood viscosity and red blood cell function.

Main Methods:

Exposing blood to magnetic fields of 1 Tesla (T) or higher, aligned with the blood flow direction.
Applying a single magnetic field pulse of 1.3 T for approximately 1 minute.
Monitoring changes in blood viscosity post-exposure and over time.
Evaluating the functional integrity of red blood cells after magnetic field treatment.

Main Results:

A single magnetic field pulse (1.3 T, ~1 min) reduced blood viscosity by 20%-30%.
Blood viscosity gradually returned to baseline levels over several hours in the absence of a magnetic field.
The viscosity-reducing effect of magnetic fields is repeatable.
Magnetic field exposure did not impair the normal function of red blood cells.

Conclusions:

Magnetic field application is a viable method for reducing blood viscosity.
This technique offers a repeatable and non-damaging approach to manage blood viscosity.
The findings suggest potential applications for magnetic field therapy in cardiovascular health and physical therapy.