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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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NMR Spectrometers: Overview01:20

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Crude Oil Analysis by Low-Field NMR Relaxometry.

Salim Ok1, Marsel Fazlyyyakhmatov2,3

  • 1Petroleum Research Center, Kuwait Institute for Scientific Research, Safat, Kuwait.

Magnetic Resonance in Chemistry : MRC
|March 15, 2026
PubMed
Summary
This summary is machine-generated.

Low-field nuclear magnetic resonance (LF-NMR) offers a rapid, non-destructive method for characterizing crude oil properties. This technique shows strong potential for improving petroleum analysis and flow assurance.

Keywords:
classificationcrude oillow‐field NMR relaxometry

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Area of Science:

  • Petroleum Geochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Conventional ASTM methods for crude oil characterization are time-consuming and use toxic reagents.
  • There is a need for faster, safer, and more efficient analytical techniques in the petroleum industry.

Purpose of the Study:

  • To review recent advancements in applying Low-field Nuclear Magnetic Resonance (LF-NMR) relaxometry for crude oil analysis.
  • To highlight the potential of LF-NMR in predicting crude oil properties and analyzing complex systems.

Main Methods:

  • Summarizing recent literature on LF-NMR relaxometry applied to crude oils and their fractions.
  • Discussing correlations between relaxation times, viscosity, density, and machine learning applications.
  • Examining LF-NMR applications in crude oil emulsions and SARA analysis.

Main Results:

  • LF-NMR relaxometry demonstrates strong correlations with viscosity and density.
  • Machine learning enhances the predictive accuracy of crude oil properties using LF-NMR data.
  • LF-NMR provides insights into droplet size, phase composition, and stability of crude oil emulsions.
  • New LF-NMR approaches extend characterization to complex water-oil systems.

Conclusions:

  • LF-NMR relaxometry is a versatile, rapid, and non-destructive tool for crude oil characterization.
  • This technique has significant potential for both laboratory analysis and practical flow assurance in petroleum production.