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関連する概念動画

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...
6.6K
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...
4.2K
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...
1.8K

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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

14.6K

マグネティック・カーボン・カーボン

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
まとめ
この要約は機械生成です。

研究者らは,分子炭素の形態であるロンボエドールC60に強い磁気信号を発見した. この偶然の発見は,室温でフェロマグネティズムを持つ磁気的に秩序付けられた状態を明らかにしています.

さらに関連する動画

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
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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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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

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関連する実験動画

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

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
08:25

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

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科学分野:

  • マテリアルサイエンス 材料科学
  • 凝縮物質物理学 凝縮物質物理学
  • 化学 化学は化学です.

背景:

  • グラファイトやC60を含むナノ構造の炭素材料は,多様な性質を示しています.
  • 超伝導性は,電子ドーピングされたグラファイトとC60で達成されており,過渡温度は最大52Kに達しています.
  • 理論的な研究は,電子の不安定性のために純粋なグラファイトで室温の超伝導性と鉄磁性の可能性を示唆しています.

研究 の 目的:

  • ポリメリ化C60.0における超伝導性を調査する.
  • ロンボエドールC60.0の磁気特性を探求する.

主な方法:

  • 高圧,高温ポリメリゼーションプロセスは,C60.60に適用されます.
  • 飽和磁化,ヒステレシス,および温度依存を含む磁性特性の特徴付け.

主要な成果:

  • 磁気的に秩序付けられた状態は,ロンボエドールC60.0で意外と観察されました.
  • この材料は,室温での飽和磁化やヒステレシスなどの,フェロマグネットの特徴を示しています.
  • 温度依存磁化測定により,500K近くのキュリー温度が示されました.

結論:

  • C60の高圧,高温ポリメリゼーションは,磁気的に秩序付けられた状態につながる可能性があります.
  • ロンボエドールC60は,室温で強力な鉄磁気特性を示しています.
  • この発見は,炭素基の材料における磁気現象の研究に新たな道を開く.