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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
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Swelling layered minerals applications: A solid state NMR overview.

Esperanza Pavón1, María D Alba2

  • 1Instituto Ciencia de los Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio, 49, 41092 Sevilla, Spain; Departamento de Física de la Materia Condensada, Universidad de Sevilla, Avda. Reina Mercedes, s/n, 41012 Sevilla, Spain.

Progress in Nuclear Magnetic Resonance Spectroscopy
|September 4, 2021
PubMed
Summary
This summary is machine-generated.

Solid State Nuclear Magnetic Resonance (SS-NMR) reveals the dynamics and structure of swelling layered clay minerals. This review highlights SS-NMR

Keywords:
Clay applicationsDynamicsSolid State NMRStructureSwelling clay minerals

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Mineralogy

Background:

  • Swelling layered clay minerals, a phyllosilicate subgroup, exhibit reversible expansion/contraction with water.
  • These adaptable materials find applications in environmental remediation, catalysis, pharmaceuticals, and industry.
  • Traditional characterization methods like X-ray diffraction offer limited insight into clay dynamics.

Purpose of the Study:

  • To review the significant contributions of Solid State Nuclear Magnetic Resonance (SS-NMR) spectroscopy.
  • To elucidate the mechanisms governing key applications of swelling layered clay minerals.
  • To provide an in-depth understanding of SS-NMR's capabilities in characterizing these materials.

Main Methods:

  • Review of existing literature on SS-NMR applications to layered clay minerals.
  • Analysis of SS-NMR data for structural and dynamic information.
  • Comparison of SS-NMR findings with other characterization techniques.

Main Results:

  • SS-NMR provides crucial structural and dynamic information often unobtainable by other methods.
  • The review details conventional SS-NMR applications in layered clay mineral characterization.
  • An in-depth analysis is presented on SS-NMR's insights into swelling layered clay mineral properties.

Conclusions:

  • SS-NMR is indispensable for understanding the complex behavior of swelling layered clay minerals.
  • This technique unlocks detailed insights into material dynamics and structure.
  • The review underscores SS-NMR's pivotal role in advancing applications of these versatile minerals.