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Related Concept Videos

Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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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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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.
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The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
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Related Experiment Video

Updated: Jan 5, 2026

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays
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Inducing a Net Positive Flow of Water in Functionalized Concentric Carbon Nanotubes Using Rotating Electric Fields.

David Ostler1, Sridhar Kumar Kannam1, Federico Frascoli1

  • 1Department of Mathematics, School of Science, Faculty of Science, Engineering and Technology , Swinburne University of Technology , Melbourne , Victoria 3122 , Australia.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 16, 2019
PubMed
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This study demonstrates electropumping can create water flow in carbon nanotubes (CNT). Functionalizing CNTs with carboxyl groups breaks symmetry, inducing net positive flow, consistent with continuum theory.

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Area of Science:

  • Nanotechnology
  • Fluid Dynamics
  • Physical Chemistry

Background:

  • Electropumping shows promise for directed fluid transport in confined spaces.
  • Understanding nanoscale fluid behavior is crucial for developing advanced microfluidic devices.

Purpose of the Study:

  • To investigate electropumping-induced water flow in concentric carbon nanotubes (CNTs).
  • To demonstrate the effectiveness of breaking channel symmetry via functionalization for directional flow.

Main Methods:

  • Nonequilibrium molecular dynamics (NMD) simulations.
  • Continuum-based numerical solutions of hydrodynamic equations.
  • Functionalization of inner CNT surface with carboxyl groups.

Main Results:

  • Achieved effective net positive water flow between concentric CNTs using electropumping.
  • Demonstrated that functionalization breaks channel symmetry, inducing directional flow.
  • NMD results align with continuum theory predictions.

Conclusions:

  • Electropumping is a viable method for controlling water flow at the nanoscale within CNTs.
  • Symmetry breaking through controlled functionalization is key to achieving directed flow.
  • The study validates continuum theory for describing electropumping phenomena in CNTs.