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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Capacitor With A Dielectric01:18

Capacitor With A Dielectric

Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
Capacitors and Capacitance01:18

Capacitors and Capacitance

A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...
MOS Capacitor01:25

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

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Updated: May 13, 2026

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
10:11

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

Temperature-dependent capacitance of the electrical double layer.

Ole Nickel1,2, Mathijs Janssen3, Alexander Schlaich4

  • 1Institute for Interface Physics and Engineering, Hamburg University of Technology, Hamburg, Germany.

The Journal of Chemical Physics
|May 12, 2026
PubMed
Summary
This summary is machine-generated.

Atomistic simulations reveal the thermal voltage rise (TVR) in electrical double layers (EDLs) is not due to EDL expansion. Instead, TVR results from a decrease in interfacial permittivity as temperature increases.

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Area of Science:

  • Physical Chemistry
  • Electrochemistry
  • Materials Science

Background:

  • The electrical double layer (EDL) governs electrode-electrolyte interactions.
  • Thermal voltage rise (TVR) is an observed phenomenon in EDLs with increasing temperature.
  • Existing continuum models propose EDL expansion as the cause of TVR.

Purpose of the Study:

  • To investigate the underlying mechanisms of thermal voltage rise (TVR) in electrical double layers (EDLs) using atomistic simulations.
  • To challenge and refine existing continuum models of TVR.
  • To elucidate the role of temperature on EDL structure and properties.

Main Methods:

  • Atomistic simulations were employed to model the electrode-electrolyte interface.
  • Simulations were conducted across a range of temperatures.
  • The behavior of aqueous, organic, and ionic liquids was analyzed.

Main Results:

  • Contrary to prior models, atomistic simulations demonstrated that the EDL does not expand with increasing temperature.
  • A constrained electrode charge condition was maintained.
  • The potential drop across the EDL was observed to increase with temperature, confirming TVR.

Conclusions:

  • The thermal voltage rise (TVR) is primarily caused by a decrease in interfacial permittivity with rising temperatures.
  • The EDL structure does not significantly expand with temperature.
  • Atomistic simulations provide a more accurate mechanistic understanding of EDL behavior than continuum models.