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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

51
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
51
Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

46
The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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The Electrical Double Layer01:30

The Electrical Double Layer

102
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

3.0K
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

5.4K
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.
For extracting a solute from an aqueous phase into an...
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Energetics of Solution Formation02:35

Energetics of Solution Formation

7.7K
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.
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. Formation of the solution requires the solute–solute and solvent–solvent...
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Preparation of Binary and Ternary Deep Eutectic Systems
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Charge Spreading in Deep Eutectic Solvents.

Stefan Zahn1, Barbara Kirchner2, Doreen Mollenhauer1

  • 1Physikalisch-Chemisches-Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392, Gießen, Germany.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|August 24, 2016
PubMed
Summary
This summary is machine-generated.

Deep eutectic solvents show reduced ion charges, challenging the role of hydrogen bonding in their low melting points. This research explores charge delocalization in these eco-friendly ionic liquid alternatives.

Keywords:
ab initio molecular dyanmic simulationscharge transferdeep eutectic solventshydrogen bondingionic liquids

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Deep eutectic solvents (DES) are cost-effective and sustainable alternatives to traditional ionic liquids.
  • The unique properties of DES, particularly their low melting points, are often attributed to charge delocalization via hydrogen bonding.

Purpose of the Study:

  • To investigate the distribution of ionic charges within choline-based DES using advanced simulation techniques.
  • To evaluate the contribution of hydrogen bonding to charge delocalization and its impact on the melting point of DES.

Main Methods:

  • Utilizing *ab initio* molecular dynamic simulations to model the behavior of ions and molecules in DES.
  • Analyzing charge distribution and hydrogen bond strengths within various choline-based DES systems.

Main Results:

  • Simulations revealed significantly reduced ion charges in several choline-based DES.
  • Increased hydrogen bond strength promoted charge spreading from anion to organic components, with positive charge localized on the cation.
  • Charge transfer from chloride to urea in choline chloride urea mixtures was found to be negligible.

Conclusions:

  • The observed reduced ion charges question the prevailing theory that charge delocalization through hydrogen bonding is the primary driver of the low melting points in DES.
  • Further research is needed to fully understand the mechanisms governing the unique properties of these promising green solvents.