Alternating Magnetic Field
Alternating Magnetic Field - Related Videos
09:11
Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release
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Cited by 10 •
2016
We present a facile method to fabricate a biodegradable gelatin-based drug release platform that is magneto-thermally responsive. This was achieved by incorporating superparamagnetic iron oxide nanoparticles and poly(N-isopropylacrylamide-co-acrylamide) within a spherical gelatin micro-network crosslinked by genipin, in conjunction with an alternating magnetic field application system.
10:04
Magnetic Fields
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Magnetic fields can be generated by moving charges, such as an electrical current. The magnetic field generated by a current can be calculated from the Maxwell equation. In addition, magnetic objects such as bar magnets can also generate magnetic fields due to microscopic dynamics of charges inside the material. Magnetic fields will exert magnetic force on other moving...
01:28
Magnetic Fields
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2026
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...
09:12
Electric Charge in a Magnetic Field
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2023
Source: Andrew Duffy, PhD, Department of Physics, Boston University, Boston, MA This experiment duplicates J.J. Thomson's famous experiment at the end of the 19th century, in which he measured the charge-to-mass ratio of the electron. In combination with Robert A. Millikan's oil-drop experiment a few years later that produced a value for the charge of the electron, the experiments enabled scientists to find, for the first time, both the mass and the charge of the electron, which are key...
02:26
Stimulation of Patterned Neuronal Cultures by a Magnetic Field
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2025
This video demonstrates a method for stimulating neuronal cultures grown in a patterned circular ring on a coverslip, using a time-varying magnetic field.
FAQs
Because biological tissues are electrically conductive, a changing magnetic environment can induce electrical currents within them. The resulting stimulation depends on exposure conditions and tissue properties, and it provides a way to investigate how electromagnetic inputs affect biological systems. This mechanism is distinct from nanoparticle heating, which relies on magnetic materials rather than tissue conductivity alone.
Magnetic nanoparticles can convert energy from the applied field into heat through magnetic relaxation or hysteresis losses. Relaxation describes energy dissipation as magnetic moments respond to changing conditions, whereas hysteresis losses arise from repeated magnetization changes. Their particle properties therefore influence how efficiently energy is deposited, which is important for controlled biological heating.
Field frequency, field strength, exposure time, and magnetic particle properties are the main adjustable factors identified for controlling energy deposition. Changing these variables can alter the amount and distribution of heat or electromagnetic influence experienced by cells and tissues. Researchers use this control to investigate therapeutic strategies while examining biological responses under defined exposure conditions.
An alternating magnetic field can influence biology through at least two pathways: induced electrical currents in conductive tissue and heat generated by magnetic nanoparticles. The first pathway emphasizes electromagnetic stimulation, while the second emphasizes localized energy conversion by particles. Separating these mechanisms helps researchers interpret whether observed cellular or tissue responses relate primarily to stimulation, heating, or both.
A study typically varies field frequency, strength, and exposure time, while also considering whether magnetic nanoparticles are present and which particle properties they possess. Researchers then examine the resulting effects on cells or tissues. This parameter-based approach allows energy deposition and biological outcomes to be investigated systematically rather than treating exposure as a fixed condition.
In magnetic hyperthermia research, magnetic nanoparticles respond to the applied field by generating heat through relaxation or hysteresis losses. Researchers adjust exposure conditions and particle properties to control energy deposition, then evaluate effects on cells or tissues. This approach supports investigation of heating-based therapeutic strategies, including studies relevant to cancer research.
Magnetic fields provide an external means of influencing systems that contain magnetic components, supporting research into remotely controlled drug delivery. By adjusting field conditions and particle properties, investigators can study how magnetic energy is applied without relying solely on direct access to the target system. The overview identifies this as an application alongside hyperthermia and cellular stimulation.
Researchers can evaluate how cells and tissues respond to electromagnetic stimulation, nanoparticle-associated heating, or both. Outcomes are interpreted in relation to exposure time, field frequency, strength, and particle characteristics. This makes the approach useful for studying cellular responses, assessing potential therapeutic strategies, and connecting controlled electromagnetic conditions with biological effects.