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相关概念视频

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

259
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
259
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

191
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...
191
Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

641
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...
641
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

616
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...
616
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

630
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
630

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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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追踪树突和固体电解质相间形成与动态核极化-NMR光谱学.

Ayan Maity1, Asya Svirinovsky-Arbeli1, Yehuda Buganim1

  • 1Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot, Israel.

Nature communications
|November 17, 2024
PubMed
概括

研究人员使用先进的NMR技术研究金属电池的聚合物陶电解质中的树突. 了解树突形成和固体电解质相间特性是提高电池安全性和寿命的关键.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 频谱学是一种光谱学.

背景情况:

  • 聚合物陶复合电解质对于开发高能量密度金属电池至关重要.
  • 树状石的形成和固体电解质间相 (SEI) 是阻碍电池性能和安全的重大挑战.
  • 缺乏详细的分子层面的理解树的生长和SEI属性.

研究的目的:

  • 研究聚合物-陶复合电解质中树脂的形成和传播机制.
  • 描述金属接口的固体电解质介面 (SEI) 的组成和特性.
  • 为了确定树特征,SEI特性和总体电池寿命之间的相关性.

主要方法:

  • 使用了固态核磁共振 (NMR) 谱学.
  • 使用Overhauser动态核极化 (DNP) 来增强通过从金属导电电子的极化转移来增强接口灵敏度.
  • 结合光谱数据,以获得分子层面的洞察力,了解状岩的形成和SEI特征.

主要成果:

  • 在复合电解质中获得了关于树形成和传播的详细分子层次理解.
  • 确定了金属固体电解质介相 (SEI) 的组成和特性.
  • 与陶含量和电池寿命相关的树质量和生长路径.
  • 通过分析DNP增强和将其与Li运输相关联,量化SEI透性.

结论:

  • 树岩的形成和传播受到聚合物陶电解质中的陶含量的影响.
  • 通过使用Overhauser DNP,可以直接确定SEI的运输特性.
  • 这些发现为设计改进的SEI层和管理树突来获得更安全,更持久的金属电池提供了关键的见解.