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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...
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Solubility Equilibria: Ionic Product of Water

Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
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Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct microscopic...
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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...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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 concentration...
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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 bonds, and dispersion...

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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Nonequilibrium water transport in a nonionic microemulsion system.

Maria Minakova1, Alexey Savelyev, Garegin A Papoian

  • 1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, United States.

The Journal of Physical Chemistry. B
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Summary

Surfactants facilitate passive water transport through oil in microemulsions. Elevated temperatures increase water presence by enabling larger aggregate movement, supporting a "hydrated surfactants" mechanism.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Microemulsions are complex fluids with applications in various industries.
  • Understanding water transport mechanisms is crucial for optimizing microemulsion performance.
  • The water/octane/C(9)E(3) system serves as a model for studying surfactant-oil-water interactions.

Purpose of the Study:

  • To investigate the relaxation dynamics and water transport mechanisms in a water/octane/C(9)E(3) microemulsion.
  • To determine the role of the surfactant (C(9)E(3)) in facilitating water transport through the oil phase (octane).
  • To explore the influence of temperature on microemulsion structure and water solubilization.

Main Methods:

  • Microsecond timescale atomistic simulations were employed to model the microemulsion system.
  • The study examined the system across a wide temperature range (7-88 °C).
  • Cluster analysis was utilized to characterize the aggregation behavior and water distribution.

Main Results:

  • The surfactant (C(9)E(3)) acts as an effective solvent, enabling passive water transport through octane.
  • Solubilized water is primarily located between surfactant and oil layers, not homogeneously distributed.
  • Increasing temperature promotes the movement of larger aggregates, enhancing water presence in the oil phase.

Conclusions:

  • The findings support a "hydrated surfactants" transport mechanism, where surfactants carry water through the oil.
  • Microemulsion structure and water transport are temperature-dependent.
  • The non-homogeneous distribution of water highlights the complex interfacial behavior within the microemulsion.