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Related Concept Videos

Freezing Point Depression and Boiling Point Elevation01:24

Freezing Point Depression and Boiling Point Elevation

When a non-volatile solute is added to a pure solvent, it results in the lowering of the freezing point of the solvent. This phenomenon is called freezing point depression. The extent to which the freezing point is lowered depends on the molality of the solute -the number of moles of solute per kilogram of solvent and the cryoscopic constant of the solvent.From the plot of chemical potential, μ, against temperature, it is evident that the μ of both solid and liquid solvents decrease with...
Freezing Point Depression and Boiling Point Elevation03:12

Freezing Point Depression and Boiling Point Elevation

Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
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...
Osmosis and Osmotic Pressure of Solutions02:40

Osmosis and Osmotic Pressure of Solutions

A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary cation—the calcium...

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Updated: Jun 23, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
11:04

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Solute diffusion in nonionic liquids--effects of gravity.

Reginald W Smith1, Paul J Scott, Barbara Szpunar

  • 1Queen's University, Mechanical and Materials Engineering, Kingston, Ontario, Canada.

Annals of the New York Academy of Sciences
|May 12, 2009
PubMed
Summary
This summary is machine-generated.

Gravity

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The Diffusion of Passive Tracers in Laminar Shear Flow
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Area of Science:

  • Materials Science
  • Physics
  • Physical Chemistry

Background:

  • Solute diffusion coefficients (D) in metals and semimetals are crucial for understanding material properties.
  • Previous experiments measured D with temperature (T), often showing a parabolic relationship.
  • Microgravity experiments are essential to isolate diffusion processes from gravitational influences.

Purpose of the Study:

  • To investigate the influence of gravity on solute diffusion coefficients (D) in fused metals and semimetals.
  • To determine the intrinsic variation of D with temperature (T) by minimizing gravitational effects.
  • To validate experimental findings with computational modeling.

Main Methods:

  • Experiments were conducted on the Space Shuttle and the Russian space station MIR.
  • A microgravity isolation mount (MIM) was used to reduce g-jitter.
  • Solute diffusion couples were analyzed using long capillary methods.
  • Molecular dynamics simulations were employed to model solute diffusion.

Main Results:

  • Under microgravity conditions (using MIM), solute diffusion coefficients (D) increased linearly with temperature (T).
  • In the presence of g-jitter, the familiar parabolic relationship between D and T was observed.
  • Modeling studies estimated the effects of g-jitter on solute distribution and diffusion.

Conclusions:

  • Microgravity isolation is critical for accurately measuring intrinsic solute diffusion coefficients.
  • Gravitational effects (g-jitter) significantly alter the observed temperature dependence of diffusion.
  • Linearity of D with T under microgravity suggests a more fundamental diffusion mechanism.