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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Dynamic heterogeneity in aqueous ionic solutions.

Gan Ren1, Lin Chen, Yanting Wang

  • 1Department of Physics, Civil Aviation Flight University of China, Guanghan, China.

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|August 9, 2018
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Summary
This summary is machine-generated.

Dynamic heterogeneity, common in supercooled liquids, is also found in aqueous ionic solutions at room temperature. This phenomenon, driven by transient ion clusters, offers insights into ion transport and solution behavior.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Supercooled liquids exhibit complex dynamics, known as dynamic heterogeneity.
  • The existence of dynamic heterogeneity in aqueous ionic solutions at ambient or elevated temperatures remains largely unexplored.

Purpose of the Study:

  • To investigate the presence and characteristics of dynamic heterogeneity in aqueous ionic solutions.
  • To elucidate the underlying mechanisms responsible for dynamic heterogeneity in these systems.
  • To compare the observed phenomena with those in supercooled liquids.

Main Methods:

  • Molecular dynamics simulations were employed using potassium thiocyanate (KSCN) aqueous solutions as a model system.
  • Analysis included non-Gaussian parameter, self-van Hove function, dynamic susceptibility, and self-intermediate scattering function.
  • Investigated the temperature dependence of ionic dynamics and cluster formation.

Main Results:

  • Evidence of dynamic heterogeneity was found in KSCN aqueous solutions at room and higher temperatures.
  • Ionic thermal movements deviate from Gaussian distributions, indicating heterogeneous dynamics.
  • Dynamics become more homogeneous at higher temperatures, with transient ion clusters identified as a key factor.

Conclusions:

  • Dynamic heterogeneity in aqueous ionic solutions is analogous to that in supercooled liquids, albeit with quantitative differences.
  • Transient ion cluster formation and dissociation are proposed as the source of this heterogeneity.
  • Fractional Stokes-Einstein relations are observed, highlighting similarities with supercooled liquid behavior.