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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
Calculations of Electric Potential II01:27

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An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
Consider a...
Induced Electric Dipoles01:28

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Force and Potential Energy in One Dimension01:13

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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...
Calculations of Electric Potential I01:15

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Consider a ring of radius R with a uniform charge density λ. What will the electric potential be at point M, which is located on the axis of the ring at a distance x from the center of the ring?
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Electric Dipoles and Dipole Moment01:30

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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Effective isotropic potential for dipolar hard spheres.

P I C Teixeira1

  • 1Instituto Superior de Engenharia de Lisboa, Lisbon, Portugal. piteixeira@cii.fc.ul.pt

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 5, 2013
PubMed
Summary
This summary is machine-generated.

A novel effective potential for dipolar hard-sphere fluids reveals oscillations at higher densities, improving upon existing models. This finding enhances our understanding of fluid behavior with dipole interactions.

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Area of Science:

  • Statistical mechanics
  • Soft matter physics
  • Computational physics

Background:

  • Dipolar hard-sphere fluids are fundamental models in statistical mechanics.
  • Existing effective isotropic potentials struggle to capture complex fluid behaviors.
  • Understanding particle interactions is crucial for predicting macroscopic properties.

Purpose of the Study:

  • To develop a new, more accurate effective isotropic potential for dipolar hard-sphere fluids.
  • To investigate the oscillatory behavior of this new potential.
  • To compare the new potential with existing models.

Main Methods:

  • Utilizing recent findings on the angle-averaged radial distribution function.
  • Developing and applying a novel effective isotropic potential.
  • Analyzing the potential's behavior across various densities and dipole strengths.

Main Results:

  • The proposed effective potential exhibits oscillations even at moderate densities and dipole strengths.
  • These oscillations are absent in previously developed effective isotropic potentials.
  • The results suggest a more nuanced description of fluid structure.

Conclusions:

  • The new effective potential offers a significant improvement for modeling dipolar hard-sphere fluids.
  • The observed oscillations highlight the importance of accurate potential representation.
  • This work provides a valuable tool for further theoretical and simulation studies.