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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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.
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Nuclear Overhauser Enhancement (NOE)01:07

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Imaging Radial Distribution Functions of Complex Particles by Relayed Dynamic Nuclear Polarization.

Pierrick Berruyer1, Cynthia Cibaka-Ndaya2, Arthur Pinon3

  • 1Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.

Journal of the American Chemical Society
|April 19, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel nuclear magnetic resonance (NMR) method using dynamic nuclear polarization to image the internal microstructure of multi-component materials, achieving nanometer resolution for core-shell particles.

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Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Analytical Chemistry

Background:

  • The physical properties of multi-component materials are dictated by their internal microstructure.
  • Characterizing nanoscale architectures is crucial for designing materials with specific properties.
  • Existing methods like electron microscopy struggle with contrast for organic-only composites, common in pharmaceuticals and polymers.

Purpose of the Study:

  • To develop a new imaging technique for visualizing the internal structure of multi-component materials.
  • To overcome the contrast limitations of traditional methods for organic materials.
  • To leverage nuclear magnetic resonance (NMR) spectroscopy's chemical shift capabilities for enhanced contrast.

Main Methods:

  • Utilized dynamic nuclear polarization (DNP) to obtain hyperpolarized nuclear spins.
  • Employed NMR measurements to track the relay of this nuclear hyperpolarization.
  • Developed a method to reconstruct radial images of particle interiors from DNP-enhanced NMR signals.

Main Results:

  • Successfully generated radial images of hybrid core-shell particles with nanometer resolution.
  • Demonstrated the method's efficacy on polystyrene core/mesoporous silica shell particles.
  • Showcased the ability to distinguish and image different components within the composite structure.

Conclusions:

  • The DNP-enhanced NMR method provides high-resolution imaging of multi-component material microstructures.
  • This technique offers a viable solution for contrast challenges in organic-rich composite materials.
  • The developed imaging approach has significant potential for materials design and characterization.