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Videos de Conceptos Relacionados

Electric Field01:16

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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
In the new picture, imagine that the first charge sets up an electric field independent of all other charges in the universe. When another charge comes in its vicinity, the second charge experiences an electric force depending on the electric field at that point. The source charge does not...
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Determining Electric Field From Electric Potential01:12

Determining Electric Field From Electric Potential

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The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
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Finding Electric Potential From Electric Field01:13

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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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Electric Field Inside a Conductor01:20

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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
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Electric Field Lines01:25

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The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths decrease as the square of their distance from the charge and which point away from the charge at each point. This vector field is no doubt challenging to visualize. The visualization of electric fields becomes quickly intractable as the number of charges increases.
The solution to this problem is to use electric field lines, which are not vectors but...
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Induced Electric Fields01:23

Induced Electric Fields

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Simulation of a Scaled Assembly Process with Collaboration of a Robotic Arm and Monitoring through a Vision System for Quality Control
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Un brazo robótico autoensamblado controlado por campos eléctricos

Enzo Kopperger1, Jonathan List1, Sushi Madhira2

  • 1Physics Department E14, Technical University Munich, 85748 Garching, Germany.

Science (New York, N.Y.)
|January 20, 2018
PubMed
Resumen

Los investigadores desarrollaron un nanorobot de ADN con un brazo robótico de 25 nm, extensible a 400 nm. Este nanorobot ofrece una activación de milisegundos para el transporte molecular y la aplicación de fuerza en la nanotecnología.

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Área de la Ciencia:

  • Nanotecnología
  • La robótica molecular
  • La biofísica

Sus antecedentes:

  • Las nanoestructuras dinámicas de ADN son cruciales para la nanorrobótica avanzada.
  • Se necesitan mecanismos de activación rápidos y fiables para estas nanoestructuras.

Objetivo del estudio:

  • Para crear una plataforma molecular basada en el ADN con un brazo robótico controlado con precisión.
  • Para demostrar la capacidad de la plataforma para el transporte molecular y la aplicación de fuerza.

Principales métodos:

  • Fabricación de una plataforma de ADN de 55nm x 55nm con un brazo robótico integrado.
  • Actuación mediante campos eléctricos aplicados externamente.
  • Caracterización mediante transferencia de energía de resonancia Förster de un solo par (spFRET) y microscopia de fluorescencia.

Principales resultados:

  • El brazo robótico, inicialmente de 25 nm, puede extenderse más de 400 nm.
  • Posicionamiento preciso del brazo controlado por computadora alcanzado en milisegundos.
  • Se ha demostrado el transporte eléctrico de moléculas/nanopartículas a lo largo de decenas de nanómetros.
  • Aplicación de fuerzas piconewtonianas para la fusión dúplex del ADN.

Conclusiones:

  • La plataforma de nanorobots de ADN desarrollada permite un control rápido y preciso para aplicaciones nanorrobóticas.
  • La plataforma facilita la manipulación molecular y la aplicación de fuerza, con potencial para controlar los procesos fotónicos y plasmónicos.