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Updated: May 5, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Published on: June 7, 2018

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使用双脉冲场梯度NMR探测不透明异质系统的微观架构

Noam Shemesh1, Tal Adiri, Yoram Cohen

  • 1School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel.

Journal of the American Chemical Society
|March 31, 2011
PubMed
概括

一种新的角双极双脉冲场梯度 (bp-d-PFG) 方法在复杂系统中非侵入性地描绘了微观架构. 这种技术揭示了材料和生物组织中的毛孔空间,隔间形状和大小.

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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.
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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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