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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

122
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...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
76.8K
Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

65
The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Ionic Association01:28

Ionic Association

166
The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Updated: Mar 24, 2026

Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition
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Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition

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Voltage-Controlled Interfacial Layering in an Ionic Liquid on SrTiO3.

Trevor A Petach1, Apurva Mehta2, Ronald Marks2

  • 1Department of Physics, Stanford University , Palo Alto, California 94305, United States.

ACS Nano
|March 10, 2016
PubMed
Summary
This summary is machine-generated.

Ionic liquids form distinct cation and anion layers near surfaces. Applied voltage thickens these layers and increases cation accumulation, revealing new insights into ionic liquid behavior at interfaces.

Keywords:
SrTiO3X-ray reflectivityelectric double layerelectrolyte gatingionic liquid

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Science

Background:

  • Ionic liquids exhibit layered structures of cations and anions at interfaces.
  • The response of these ionic liquid layers to applied electrical potentials is not well understood.

Purpose of the Study:

  • To investigate the structural response of 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl) trifluorophosphate (BMPY-FAP) ionic liquid layers to an applied potential near a strontium titanate (SrTiO3) surface.
  • To quantify changes in charge density and layer thickness under electrical bias.

Main Methods:

  • X-ray reflectivity measurements were employed to probe the ionic liquid structure.
  • A modified distorted crystal model was used to analyze reflectivity data and extract interfacial properties.

Main Results:

  • Layering of cations and anions in BMPY-FAP was observed near the SrTiO3 surface.
  • Positive applied bias led to thickening of individual ionic liquid layers and extended layering away from the interface.
  • Charge density exhibited strong oscillations, and a gate bias of 4.5 V significantly increased cation richness in the first two layers, accumulating 2.5 × 10(13) cm(-2) excess charge.

Conclusions:

  • The study demonstrates that applied electrical potential significantly modifies the layered structure of ionic liquids at surfaces.
  • The findings provide a quantitative understanding of ionic liquid behavior in electric double-layer transistors, crucial for device optimization.