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相关概念视频

Carbon-13 (¹³C) NMR: Overview01:10

Carbon-13 (¹³C) NMR: Overview

6.6K
Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
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Magnetic Fields01:27

Magnetic Fields

6.0K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
6.0K
Magnetic Flux01:18

Magnetic Flux

4.2K
The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
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Magnetic Force01:18

Magnetic Force

2.4K
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
2.4K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.9K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
2.9K
Magnetic Vector Potential01:15

Magnetic Vector Potential

1.8K
In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
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相关实验视频

Updated: May 6, 2026

Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma
09:48

Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma

Published on: February 2, 2012

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磁性碳是一种磁性碳.

T L Makarova1, B Sundqvist, R Höhne

  • 1Ioffe Physico-Technical Institute, 194021 St Petersburg, Russia. tatiana.makarova@physics.umu.se

Nature
|October 19, 2001
PubMed
概括
此摘要是机器生成的。

研究人员在体C60中发现了强烈的磁信号,这是一种分子碳的形式. 这种偶然的发现揭示了在室温下具有铁磁性的磁性有序状态.

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Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma
09:48

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Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
10:34

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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 化学 化学 化学

背景情况:

  • 纳米结构的碳材料,包括石墨和C60,表现出不同的特性.
  • 在电子合石墨和C60中实现了超导,过渡温度高达52K.
  • 理论研究表明,由于电子不稳定性,纯石墨中可能存在室温超导和铁磁.

研究的目的:

  • 为了研究聚合C60.0中的超导性.
  • 为了探索圆柱体C60.0.的磁性特性.

主要方法:

  • 高压,高温聚合过程应用于C60.0.
  • 磁性属性的表征,包括和磁化,歇斯底里斯和温度依赖性.

主要成果:

  • 一个磁性有序状态出乎意料地观察到rhombohedral C60.
  • 该材料表现出铁磁体的特征,例如在室温下和磁化和歇斯底里.
  • 温度依赖磁化测量结果显示,基里温度接近500K.

结论:

  • C60的高压,高温聚合物化可以导致磁性有序状态.
  • 体C60在室温下表现出强大的铁磁性质.
  • 这一发现为探索碳基材料中的磁现象开辟了新的途径.