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Related Concept Videos

Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
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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...
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Chemical and Solubility Equilibria02:21

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The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
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Energetics of Solution Formation02:35

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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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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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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
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Updated: Sep 12, 2025

Preparation of Binary and Ternary Deep Eutectic Systems
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Temperature-Dependent Molecular Diffusional Properties in Deep Eutectic Solvents and Eutectogels.

Hayley P Masching1,2, Nicole M Stephens1,2, Nabeel Mujtaba Abbasi1,2

  • 1Ames National Laboratory, U.S. Department of Energy, Ames, Iowa 50011-3111, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 6, 2025
PubMed
Summary
This summary is machine-generated.

Eutectogels (ETGs) exhibit faster molecular diffusion than their dry deep eutectic solvents (DESs), despite higher viscosity. Temperature cycling causes irreversible changes in ETG diffusion, impacting their use in applications.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Eutectogels (ETGs) are versatile materials derived from deep eutectic solvents (DESs), gelators, and water.
  • Their applications in separations, catalysis, and energy storage depend critically on temperature-dependent molecular diffusion and intermolecular interactions.

Purpose of the Study:

  • To investigate the temperature-dependent molecular diffusion of Alexa Fluor 633 and ATTO 647N in choline chloride:2glycerol (glyceline) DESs and corresponding ETGs.
  • To evaluate the impact of water content (10% and 20% w/w) and temperature cycling on diffusion and material properties.

Main Methods:

  • Fluorescence Recovery After Photobleaching (FRAP) was used to measure molecular diffusion coefficients from 20 to 100 °C.
  • Differential Scanning Calorimetry (DSC) and Raman spectroscopy were employed to analyze thermal properties and intermolecular interactions.

Main Results:

  • ETGs showed faster molecular diffusion than dry DESs, attributed to their porous, 3D structure, despite higher viscosity.
  • An irreversible decrease in diffusion coefficients was observed in ETGs after temperature cycling, correlating with a shift in glass transition temperature.
  • Raman data indicated no significant changes in intermolecular interactions with temperature or water content.

Conclusions:

  • The study elucidates the complex interplay between viscosity, structure, and molecular diffusion in ETGs.
  • Findings provide crucial insights into the thermal stability and diffusion dynamics of ETGs, essential for optimizing their performance in various applications, especially under cyclic temperature conditions.