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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

570
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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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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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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High-Pressure NMR Experiments for Detecting Protein Low-Lying Conformational States
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一个紧的和移动的迷路场NMR传感器.

Belal M K Alnajjar1, Jürgen Frick2, Bernhard Blümich3

  • 1Institute of Smart Sensors, University of Stuttgart, Stuttgart, Germany.

Journal of magnetic resonance (San Diego, Calif. : 1997)
|November 26, 2024
PubMed
概括

我们开发了一种紧的,单面的迷路场传感器,用于核磁共振 (NMR) 放松计. 这种新型传感器实现了高空间分辨率 (50μm) 来分析各种材料.

关键词:
紧型的NMR传感器文化遗产 文化遗产 文化遗产深度分析 (depth profiling) 是一种深度分析方法.这种磁铁是NMR磁铁.永久磁铁是一种永恒的磁铁.放松计放松计放松计.

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科学领域:

  • 磁共振成像是一种磁共振成像技术.
  • 材料科学 材料科学 材料科学
  • 传感器技术 传感器技术

背景情况:

  • 核磁共振 (NMR) 放松计对于材料表征至关重要.
  • 现有的核磁共振系统可能很庞大,并且缺乏高空间分辨率用于in-situ分析.
  • 对于各种材料应用,存在对紧型高分辨率传感器的需求.

研究的目的:

  • 引入一个紧的,单面的迷路场传感器用于NMR放松计.
  • 为了实现高空间分辨率和灵敏度,用于分析各种材料.
  • 在实际应用中展示传感器的多功能性和性能.

主要方法:

  • 通过使用遗传算法设计和优化了一种具有增强同质性的紧磁铁 (0.424T).
  • 开发了一种定制的射频 (RF) 线圈,以获得最大的灵敏度和侧面选择性 (<20μs死亡时间).
  • 利用3D打印结构和CPMG测量进行精确对齐并实现50μm的空间分辨率.

主要成果:

  • 传感器实现了50μm的空间分辨率,可根据采集时间进行调整.
  • 证明了高灵敏度和侧面选择性,适合微观分析.
  • 成功地将传感器应用于分析化品,弹性体,和木材.

结论:

  • 开发的紧型单面迷路场传感器为NMR放松计提供了高空间分辨率.
  • 优化的设计,对齐策略和测量方案为材料科学提供了多功能工具.
  • 这项技术能够以前所未有的分辨率对材料特性进行详细分析.