Paramagnetic Materials
Paramagnetic Materials - Related Videos
11:07
Electron Paramagnetic Resonance (EPR) Spectroscopy
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2023
Source: David C. Powers, Tamara M. Powers, Texas A&M In this video, we will learn the basic principles behind Electron Paramagnetic Resonance (EPR). We will use EPR spectroscopy to study how dibutylhydroxy toluene (BHT) behaves as an antioxidant in the autoxidation of aliphatic aldehydes.
01:30
Paramagnetism
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2023
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
07:07
Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance
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Cited by 1 •
2025
Quantitative 3D oxygen maps of murine tumors were imaged noninvasively using Pulse Electron Paramagnetic Resonance. Ultrasound B-mode and Power Doppler were used for anatomy and vascular structure. Images from both modalities were superimposed enabling multi-parametric tumor analysis.
07:24
Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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Cited by 2 •
2021
A protocol for the application of paramagnetic relaxation enhancement NMR spectroscopy to detect weak and transient inter- and intra-molecular interactions in intrinsically disordered proteins is presented.
08:01
Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Cited by 11 •
2016
A new electron paramagnetic resonance (EPR) method, rapid scan EPR (RS-EPR), is demonstrated for 2D spectral spatial imaging which is superior to the traditional continuous wave (CW) technique and opens new venues for in vivo imaging. Results are demonstrated at 250 MHz, but the technique is applicable at any frequency.
FAQs
Electronic structure determines whether atoms, ions, or molecules contain unpaired electron spins. These spins provide magnetic moments that can align with an applied field. Because the response is weak and produces positive magnetic susceptibility, the observed attraction offers a way to connect magnetic behavior with the underlying composition of the material.
Temperature changes the balance between field-driven alignment and randomizing motion. As thermal motion becomes more disruptive, fewer magnetic moments remain effectively aligned with the applied field, reducing the magnetization. This dependence makes temperature an important variable when interpreting magnetic measurements or comparing the behavior of paramagnetic compounds under different conditions.
Positive magnetic susceptibility indicates that a sample's magnetization responds in the same direction as the applied field, rather than opposing it. The magnitude of this response also matters: paramagnetic behavior is characterized by a small positive value. Physicists can therefore use susceptibility as a concise indicator when comparing magnetic materials.
Researchers can use the magnetic response as a probe of electronic structure. By examining whether a sample shows the weak positive susceptibility associated with paramagnetic behavior and how its magnetization changes with temperature, they can relate bulk magnetic observations to the presence of unpaired spins. This makes paramagnetism useful for characterizing materials and compounds.
Magnetic sensing can exploit the small field-dependent response of paramagnetic materials. Because their magnetic susceptibility is positive, an applied field produces a detectable change in magnetization, while temperature can influence the strength of that response. This makes these materials relevant when researchers connect a measured magnetic signal with field conditions or material behavior.
In magnetic separation, an applied field can take advantage of the attraction experienced by paramagnetic substances. The approach is useful when magnetic behavior helps distinguish or handle materials within a broader mixture. Its scientific basis is the field-induced response of magnetic moments, making paramagnetism relevant to separation strategies.
Paramagnetic compounds have a role in magnetic resonance imaging because their magnetic response can support contrast enhancement. This application connects the presence of unpaired electron spins and field-responsive magnetic moments with an imaging outcome. It demonstrates how electronic structure, studied through paramagnetism, can matter in a practical imaging context.