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

Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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...
Mass Spectrometry: Isotope Effect01:13

Mass Spectrometry: Isotope Effect

Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...

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

Outpatient Guidance and 1-Year Physical Function After Mitral Valve Transcatheter Edge-to-Edge Repair: An Exploratory Cohort Study.

Circulation reports·2026
Same author

Anaplastic Thyroid Carcinoma With Cardiac Dysfunction Developed During Combination Therapy With Dabrafenib and Trametinib.

Cureus·2026
Same author

Phase behaviour of liquid CO<sub>2</sub> with an impurity of water: influence of CO<sub>2</sub> hydrate.

Physical chemistry chemical physics : PCCP·2026
Same author

Hollow-needle-like nanocarbon with chirality-discriminating inner walls.

Nanoscale·2026
Same author

Amivantamab in Recurrent/Metastatic Head and Neck Squamous Cell Cancer After Checkpoint Inhibitor and Chemotherapy: Pivotal Results From the Phase Ib/II OrigAMI-4 Study.

Journal of clinical oncology : official journal of the American Society of Clinical Oncology·2026
Same author

Reducing Fish Meal Dependency in Juvenile Yellowtail Diets Using Composite By-Product Protein Mixtures.

Animals : an open access journal from MDPI·2026

相关实验视频

Updated: Jul 8, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

在单壁碳纳米角上对同位素吸附的量子效应.

Hideki Tanaka1, Hirofumi Kanoh, Masako Yudasaka

  • 1Diversity and Fractal Science, Graduate School of Science and Technology, Chiba University, Inage, Japan.

Journal of the American Chemical Society
|May 19, 2005
PubMed
概括

量子效应显著影响77K的单壁碳纳米角 (SWNHs) 上的同位素吸附.由于SWNHs中的量子扩散,模拟显示吸附的H(2) 密度低于D(2).

科学领域:

  • 材料科学 材料科学 材料科学
  • 物理化学 物理化学
  • 纳米技术纳米技术

背景情况:

  • 单壁碳纳米角 (SWNHs) 是具有独特结构性质的新型碳纳米材料.
  • 了解同位素吸附对于储能和分离应用至关重要.
  • 众所周知,量子效应在冷温度下对气体吸附起作用.

研究的目的:

  • 为了研究和比较 (H(2) 和 (D(2) 在77 K的SWNH上吸附的情况.
  • 通过大法典蒙特卡洛 (GCMC) 模拟来验证实验吸附数据.
  • 阐明量子效应对SWNHs中同位素吸附的影响.

主要方法:

  • 在77K的SWNH上实验测量H(2) 和D(2) 吸附等温体.
  • 大法典蒙特卡罗 (GCMC) 模拟,结合费曼-希布斯有效潜力来模拟量子效应.
  • 模拟预测与实验吸附数据的比较.

主要成果:

  • 结合量子效应的GCMC模拟准确地预测了在77K时在SWNHs上的实验性H(2) 和D(2) 吸附.
  • 同位素在SWNH模型的高电位场圆区域中优先吸附.
  • 量子效应导致吸附的H2密度比D2密度降低了8-26%;在较低的压力下,差异会增加.

更多相关视频

Scanning-probe Single-electron Capacitance Spectroscopy
10:53

Scanning-probe Single-electron Capacitance Spectroscopy

Published on: July 30, 2013

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

相关实验视频

Last Updated: Jul 8, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Scanning-probe Single-electron Capacitance Spectroscopy
10:53

Scanning-probe Single-electron Capacitance Spectroscopy

Published on: July 30, 2013

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

结论:

  • 费曼-希布斯有效潜力成功地模拟了同位素吸附在77K的SWNHs上的量子效应.
  • 量子力学效应在SWNHs的有限几何体内显著影响同位素吸附行为.
  • SWNHs的孔隙结构,特别是狭窄的形截面,放大了对H(2) 与D(2) 吸附的量子效应,即使在77 K.