Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Applications Of NMR In Biology01:25

Applications Of NMR In Biology

3.8K
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.
3.8K
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

2.7K
Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
2.7K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

684
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.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
684
Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

757
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...
757
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

740
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...
740
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

248
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.
Spin decoupling is usually achieved by...
248

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

The behaviour of phenothiazines as catholytes in aqueous-organic redox flow batteries.

EES batteries·2026
Same author

Photoreforming of solid waste on 1 m<sup>2</sup> scale using single-source precursor-derived co-catalyst films.

Nature chemical engineering·2026
Same author

Cesium Substitution Disrupts Concerted Cation Dynamics in Formamidinium Hybrid Perovskites.

Chemistry of materials : a publication of the American Chemical Society·2026
Same author

Poly(phosphazene)-Coatings for Stabilizing Silicon Thin-Film Anodes in Lithium-Ion-Batteries.

ACS applied materials & interfaces·2026
Same author

Evolution of Charge and Orbital Ordering, and Cation Vacancy Ordering During Electrochemical Desodiation of Na<sub><i>x</i></sub>NiO<sub>2</sub>.

Journal of the American Chemical Society·2026
Same author

Pore-intrusion of polymeric binder in supercapacitor electrodes decreases capacitance.

Nanoscale·2026
Same journal

Probing NO<sub>2</sub> Reactivity on Coinage Metal Surfaces through Liquid Crystal Orientational Responses.

The journal of physical chemistry. C, Nanomaterials and interfaces·2026
Same journal

Atomistic Simulations of Fe(CO)<sub>5</sub> Fragmentation Dynamics on a Substrate.

The journal of physical chemistry. C, Nanomaterials and interfaces·2026
Same journal

Primitive Basic Amino Acids Promote Mineral-Catalyzed Electrochemical Reduction of H<sup>+</sup> and CO<sub>2</sub>.

The journal of physical chemistry. C, Nanomaterials and interfaces·2026
Same journal

Rapid Exploration of Mixture Adsorption via Adiabatic Sampling.

The journal of physical chemistry. C, Nanomaterials and interfaces·2026
Same journal

From a Mott-Anderson Insulator to an Itinerant Metal in LaCo<sub>1-<i>x</i></sub> Ni <sub><i>x</i></sub> O<sub>3</sub>: Charge Transfer, Spin-State Percolation, and Lattice Control.

The journal of physical chemistry. C, Nanomaterials and interfaces·2026
Same journal

Effect of Precompression on Detonation Performance and Products of Energetic Materials: Application to CL-20.

The journal of physical chemistry. C, Nanomaterials and interfaces·2026
查看所有相关文章

相关实验视频

Updated: Jul 27, 2025

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

10.7K

测量溶解O的NMR方法.

Evelyna Wang1, Erlendur Jónsson1, Clare P Grey1

  • 1Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.

The journal of physical chemistry. C, Nanomaterials and interfaces
|June 7, 2023
PubMed
概括
此摘要是机器生成的。

核磁共振 (NMR) 光谱学量化了空气电池 (LAB) 中的溶解氧. 该方法准确地测量充电期间的氧气度,运输和演变,验证了LAB电解质分析的新方法.

更多相关视频

NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements
08:54

NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements

Published on: May 1, 2017

26.2K
Concentration of Metabolites from Low-density Planktonic Communities for Environmental Metabolomics using Nuclear Magnetic Resonance Spectroscopy
11:47

Concentration of Metabolites from Low-density Planktonic Communities for Environmental Metabolomics using Nuclear Magnetic Resonance Spectroscopy

Published on: April 7, 2012

12.9K

相关实验视频

Last Updated: Jul 27, 2025

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

10.7K
NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements
08:54

NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements

Published on: May 1, 2017

26.2K
Concentration of Metabolites from Low-density Planktonic Communities for Environmental Metabolomics using Nuclear Magnetic Resonance Spectroscopy
11:47

Concentration of Metabolites from Low-density Planktonic Communities for Environmental Metabolomics using Nuclear Magnetic Resonance Spectroscopy

Published on: April 7, 2012

12.9K

科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 分析化学 分析化学

背景情况:

  • 氧化还原活性物种 (如溶解氧气) 的质量运输不足是空气电池 (LAB) 的一个关键挑战.
  • 精确测量氧气度和运输对于理解和改善LAB性能至关重要.
  • 在LAB电解质中测量氧气的现有方法存在局限性.

研究的目的:

  • 开发和验证一种新的核磁共振 (NMR) 光谱方法,用于量化LAB电解质中的溶解氧.
  • 为了研究不同LAB电解质系统中的氧化溶解环境.
  • 为了证明在LAB充电过程中氧气演变的现场检测.

主要方法:

  • 使用1H,13C,7Li和19FNMR光谱测量LiTFSI电解质 (glymes,DMSO) 中的氧气度和运输.
  • 利用了O2的磁性性质,并分析了大量的磁性易感性转移和19F放松时间.
  • 进行了分子动力学模拟,以支持O2溶解的实验发现.

主要成果:

  • 来自NMR的O2和度和扩散系数与已建立的电化学和基于压力的方法保持一致.
  • 该研究实验证实了当地的O2溶解环境,与文献和模拟相一致.
  • 尽管库伦比效率低,但在现场LAB流电池充电期间成功量化了O2演变.

结论:

  • 核磁共振光谱为量化溶解氧及其在LAB电解质中的运输提供了有效和准确的方法.
  • 这种技术提供了对这些电解质内的氧气局部溶解环境的见解.
  • 在现场证明NMR检测O2演变的能力标志着LAB研究的重大进步.