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Videos de Conceptos Relacionados

Force01:06

Force

Forces affect every moment of our life. Our bodies are held to the Earth by force, and they are held together by the forces of charged particles. When we open a door, walk down a street, lift a fork, or touch a baby's face, we are applying force. Our body's atoms are held together by electrical forces, and the core of an atom, called the nucleus, is held together by the strongest force known to us—nuclear force.
The study of motion is called kinematics, but kinematics only describes the way...
Types of Forces01:09

Types of Forces

In most situations, forces can be grouped into two categories: contact forces and field forces.  Contact forces occur as a result of direct physical contact between objects. Field forces, however, act without the necessity of physical contact between objects. They depend on the presence of a "field" in the region of space surrounding the body under consideration. You can think of a field as a property of space that is detectable by the forces it exerts. Scientists think there are only four...
Frictional Force01:07

Frictional Force

When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
Force and Potential Energy in One Dimension01:13

Force and Potential Energy in One Dimension

Force can be calculated from the expression for potential energy, which is a function of position. The component of a conservative force, in a particular direction, equals the negative of the derivative of the corresponding potential energy with respect to the displacement in that direction. For regions where potential energy changes rapidly with displacement, the work done and force is maximum. Also, when force is applied along the positive coordinate axis, the potential energy decreases with...
Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
Magnetic Fields01:27

Magnetic Fields

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...

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Published on: July 18, 2014

La fuerza necesaria para mover un átomo en una superficie.

Markus Ternes1, Christopher P Lutz, Cyrus F Hirjibehedin

  • 1IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA. markust@us.ibm.com

Science (New York, N.Y.)
|February 23, 2008
PubMed
Resumen

Los investigadores midieron las fuerzas durante la manipulación atómica utilizando un microscopio de fuerza atómica. Descubrieron que las fuerzas laterales son clave para mover átomos metálicos en superficies, revelando el paisaje de energía potencial de la interacción punta-muestra.

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Área de la Ciencia:

  • Ciencias de la superficie Ciencias de la superficie.
  • Nanotecnología La nanotecnología es la nanotecnología.
  • Microscopia de la fuerza atómica.

Sus antecedentes:

  • La microscopía de sonda de barrido permite el ensamblaje atómico y molecular controlado.
  • Las fuerzas que impulsan la manipulación atómica permanecen en gran medida no cuantificadas.

Objetivo del estudio:

  • Para medir las fuerzas involucradas en la manipulación atómica.
  • Comprender los factores que influyen en el movimiento atómico en las superficies.

Principales métodos:

  • Utilizó un microscopio de fuerza atómica (AFM) para medir las fuerzas.
  • Fuerzas verticales y laterales registradas en átomos/moléculas adsorbidos individuales.
  • Genera mapas de fuerzas espaciales para determinar paisajes de energía potencial.

Principales resultados:

  • La fuerza requerida para mover un átomo es altamente dependiente del adsorbado y la superficie.
  • La fuerza lateral es el componente dominante cuando se mueven átomos metálicos en superficies metálicas.
  • El mapeo de la fuerza espacial reveló el paisaje de energía potencial de interacción de la muestra de punta completa.

Conclusiones:

  • Las mediciones de fuerza directa proporcionan una visión crítica de los mecanismos de manipulación atómica.
  • Comprender estas fuerzas es esencial para avanzar en el ensamblaje a escala de un solo átomo.
  • El mapeo de fuerzas AFM es una técnica poderosa para caracterizar las interacciones a nanoescala.