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Related Concept Videos

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
13:15

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

The force needed to move an atom on a surface.

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
Summary
This summary is machine-generated.

Researchers measured forces during atomic manipulation using an atomic force microscope. They found lateral forces are key for moving metal atoms on surfaces, revealing the tip-sample interaction potential energy landscape.

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Area of Science:

  • Surface Science
  • Nanotechnology
  • Atomic Force Microscopy

Background:

  • Scanning probe microscopy enables controlled atomic and molecular assembly.
  • The forces driving atomic manipulation remain largely unquantified.

Purpose of the Study:

  • To measure the forces involved in atomic manipulation.
  • To understand the factors influencing atomic movement on surfaces.

Main Methods:

  • Utilized an atomic force microscope (AFM) to measure forces.
  • Recorded vertical and lateral forces on individual adsorbed atoms/molecules.
  • Generated spatial force maps to determine potential energy landscapes.

Main Results:

  • The force required to move an atom is highly dependent on the adsorbate and surface.
  • Lateral force is the dominant component when moving metal atoms on metal surfaces.
  • Spatial force mapping revealed the complete tip-sample interaction potential energy landscape.

Conclusions:

  • Direct force measurements provide critical insights into atomic manipulation mechanisms.
  • Understanding these forces is essential for advancing single-atom-scale assembly.
  • AFM force mapping is a powerful technique for characterizing nanoscale interactions.