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Related Concept Videos

Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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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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Electrostatic Boundary Conditions in Dielectrics01:27

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Electrostatic Boundary Conditions01:16

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
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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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On-demand hierarchical patterning with electric fields.

Qiming Wang1, Dominick Robinson1, Xuanhe Zhao

  • 1Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, USA.

Applied Physics Letters
|October 16, 2014
PubMed
Summary
This summary is machine-generated.

Scientists developed a voltage-controlled method to create complex surface patterns on elastomer films. This technique uses electro-creasing instability for precise, on-demand topographical pattern generation.

Keywords:
elastomerselectric fieldsmultilayersshear modulusthin films

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Surface Engineering

Background:

  • Hierarchical topographical patterns are crucial for advanced material functionalities.
  • Generating such patterns with controlled feature sizes remains a challenge.
  • Existing methods often lack versatility and precise control.

Purpose of the Study:

  • To present a novel voltage-controlled method for generating hierarchical topographical patterns on demand.
  • To explore the underlying physics of electro-creasing instability in multilayer elastomer films.
  • To demonstrate the versatility and tunability of the developed technique.

Main Methods:

  • Utilizing electro-creasing instability in multilayer elastomer films.
  • Controlling pattern formation by varying elastomer modulus and layer thickness.
  • Applying prescribed voltages to induce hierarchical surface patterns.

Main Results:

  • Successfully generated hierarchical topographical patterns with controlled feature sizes.
  • Demonstrated the ability to create various pattern types (random, aligned, gradient).
  • Developed and validated a theoretical model to guide pattern design.

Conclusions:

  • The electro-creasing instability method offers precise, on-demand control over hierarchical pattern generation.
  • The technique is versatile and applicable to various pattern morphologies.
  • The theoretical model provides a framework for rational design of complex surface topographies.