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Related Concept Videos

Electric Field01:16

Electric Field

12.8K
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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Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

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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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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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Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

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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.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
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Electric Field Lines01:25

Electric Field Lines

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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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Single Particle Electron Microscopy Reconstruction of the Exosome Complex Using the Random Conical Tilt Method
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Tunable interactions between particles in conically rotating electric fields.

Kirill A Komarov1, Nikita P Kryuchkov, Stanislav O Yurchenko

  • 1Bauman Moscow State Technical University, 2nd Baumanskaya street 5, 105005 Moscow, Russia. kirillkomr@mail.ru st.yurchenko@mail.ru.

Soft Matter
|November 21, 2018
PubMed
Summary
This summary is machine-generated.

Tunable interactions between colloidal particles were calculated using the boundary element method. These interactions can be precisely controlled, offering diverse applications in self-assembly and materials science.

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Area of Science:

  • Colloidal science
  • Soft matter physics
  • Computational physics

Background:

  • Understanding and controlling interactions between colloidal particles is crucial for designing advanced materials and studying fundamental physical phenomena.
  • External fields offer a powerful means to manipulate colloidal systems, but precise control over interaction potentials remains a challenge.

Purpose of the Study:

  • To calculate tunable interactions between colloidal particles in conically rotating electric fields.
  • To compare different computational methods for analyzing these interactions.
  • To explore the range and types of tunable interactions achievable and their potential applications.

Main Methods:

  • Calculation of interactions using external conically rotating electric fields.
  • Comparison of noninteracting, self-consistent dipoles, and boundary element methods.
  • Analysis of pair and cluster interactions, focusing on two- and three-body contributions.

Main Results:

  • The boundary element method is identified as the most suitable approach for tunable interaction analysis.
  • Two- and three-body interactions are found to be the dominant contributors to interaction energy.
  • A wide spectrum of tunable interactions, including attraction, repulsion, and complex combinations, can be achieved by altering dielectric properties.

Conclusions:

  • Tunable colloidal interactions can be experimentally designed, offering significant flexibility for material design.
  • These findings are generalizable to magnetically induced interactions.
  • The ability to control interactions has broad applications in self-assembly, fluid dynamics, and crystal studies across chemical physics, physical chemistry, and materials science.