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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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Video Experimental Relacionado

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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El carbono magnético es el carbono magnético.

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
Resumen
Este resumen es generado por máquina.

Los investigadores descubrieron fuertes señales magnéticas en el C60 romboédrico, una forma de carbono molecular. Este hallazgo fortuito revela un estado ordenado magnéticamente con ferromagnetismo a temperatura ambiente.

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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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Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma
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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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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física de la materia condensada Física de la materia condensada
  • Química Química es la química.

Sus antecedentes:

  • Los materiales de carbono nanoestructurados, incluidos el grafito y el C60, exhiben diversas propiedades.
  • La superconductividad se ha logrado en grafito dopado con electrones y C60, con temperaturas de transición de hasta 52 K.
  • Los estudios teóricos sugieren el potencial de superconductividad a temperatura ambiente y ferromagnetismo en el grafito puro debido a las inestabilidades electrónicas.

Objetivo del estudio:

  • Para investigar la superconductividad en C60 polimerizado.
  • Para explorar las propiedades magnéticas del romboédrico C60.0.

Principales métodos:

  • Proceso de polimerización a alta presión y alta temperatura aplicado al C60.
  • Caracterización de las propiedades magnéticas, incluida la magnetización por saturación, la histeresis y la dependencia de la temperatura.

Principales resultados:

  • Se observó inesperadamente un estado ordenado magnéticamente en el C60.60 romboédrico.
  • El material exhibe características de los ferromagnetos, como la magnetización por saturación e histeresis a temperatura ambiente.
  • Una temperatura de Curie cercana a 500 K fue indicada por mediciones de magnetización dependientes de la temperatura.

Conclusiones:

  • La polimerización a alta presión y alta temperatura del C60 puede conducir a un estado ordenado magnéticamente.
  • El romboédrico C60 demuestra robustas propiedades ferromagnéticas a temperatura ambiente.
  • Este descubrimiento abre nuevas vías para explorar los fenómenos magnéticos en materiales basados en carbono.