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Related Concept Videos

Transport Number01:31

Transport Number

The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
Diffusion01:21

Diffusion

Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
Carrier Transport01:21

Carrier Transport

The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

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Single-Molecule Imaging of Lateral Mobility and Ion Channel Activity in Lipid Bilayers using Total Internal Reflection Fluorescence (TIRF) Microscopy
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Internal mobilities and diffusion in an ionic liquid mixture.

Céline Merlet1, Paul A Madden, Mathieu Salanne

  • 1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.

Physical Chemistry Chemical Physics : PCCP
|October 7, 2010
PubMed
Summary
This summary is machine-generated.

Internal mobilities of lithium (Li+) and potassium (K+) ions in molten LiF/KF mixtures reveal unusual type-II behavior. This distinct compositional dependence is not observed in diffusion or self-exchange velocities.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Internal mobility quantifies the relative movement of ionic species in mixtures.
  • It reflects the varying interaction strengths between different ions.
  • Understanding ionic transport is crucial for materials development.

Purpose of the Study:

  • To investigate the composition-dependent internal mobilities of Li+ and K+ ions in molten LiF/KF mixtures.
  • To compare internal mobilities with diffusion coefficients and self-exchange velocities.
  • To elucidate the underlying transport mechanisms in these molten salt systems.

Main Methods:

  • Utilized molecular dynamics simulations.
  • Employed polarizable, first-principles parameterized interaction potentials.
  • Validated simulation methods against available experimental transport data.

Main Results:

  • Internal mobilities of Li+ and K+ ions exhibit unusual type-II behavior with changing mixture composition.
  • This type-II behavior was not mirrored in the composition dependence of diffusion coefficients.
  • The self-exchange velocities also did not display the same type-II compositional trend.

Conclusions:

  • The LiF/KF molten mixture displays a unique compositional dependence in internal mobility.
  • Differential ionic interactions significantly influence internal mobility, distinct from self-diffusion.
  • First-principles simulations accurately capture complex transport phenomena in ionic melts.