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Related Concept Videos

Diffusion01:12

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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...
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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
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Homogenization of diffusion in multicomponent liquids.

Guoying Zhang1, Qi Zhang2, Qikai Li3

  • 1State Key Laboratory for Advance Metals and Materials, University of Science and Technology, Beijing 10083, People's Republic of China.

The Journal of Chemical Physics
|December 31, 2022
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Summary
This summary is machine-generated.

In multicomponent liquids, diffusion constants are similar across elements, simplifying analysis. This suggests treating diverse elements as a single "pseudo-atom" for understanding liquid properties.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Computational Materials Science

Background:

  • Diffusion is crucial for mixing and phase formation in liquids.
  • Measuring diffusion in multicomponent systems is experimentally difficult.

Purpose of the Study:

  • To investigate diffusion mechanisms in a five-component Cantor alloy liquid.
  • To determine diffusion constants and their temperature dependence.

Main Methods:

  • Employed molecular dynamics simulations.
  • Analyzed diffusion constants and atomic processes in a model Cantor alloy.

Main Results:

  • Diffusion constants followed the Arrhenius law across equilibrium and undercooled regions.
  • Activation energies were similar for all alloy elements, despite varying properties.
  • Diffusivities were homogenized across the multicomponent liquid.

Conclusions:

  • Multicomponent liquid diffusion can be simplified by treating elements as a single pseudo-atom.
  • This homogenization simplifies the study of diffusional, structural, and physical properties.