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Related Concept Videos

Ion Exchange01:17

Ion Exchange

565
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
565
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.6K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Intermolecular Forces03:13

Intermolecular Forces

58.0K
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...
58.0K
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

616
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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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

399
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Understanding Ion Distribution and Diffusion in Solid Polymer Electrolytes.

Ganesh K Rajahmundry1, Tarak K Patra1

  • 1Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 26, 2024
PubMed
Summary
This summary is machine-generated.

Researchers explored ion distribution in solid polymer electrolytes (SPEs) using molecular dynamics. They found ion diffusion strongly correlates with ion aggregate size, offering strategies to improve ion conductivity for energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Solid polymer electrolytes (SPEs) are crucial for energy storage due to their ion conduction and mechanical strength.
  • Understanding the link between ion distribution and ion conductivity in SPEs is vital but remains unclear.

Purpose of the Study:

  • To investigate the relationship between ion distribution and ion transport in SPEs.
  • To develop design strategies for enhancing ion conductivity in polymer matrices.

Main Methods:

  • Coarse-grained molecular dynamics simulations were employed.
  • Phenomenological SPE models were used to establish correlations.
  • Phase diagrams were proposed based on ion pair size, concentration, and Bjerrum length.

Main Results:

  • A crossover from discrete to percolated ion aggregates was observed with varying ion pair size.
  • Ion diffusion was found to be strongly correlated with ion aggregate size.
  • Phase diagrams were established for SPEs under different conditions.

Conclusions:

  • The study provides insights into controlling ion distribution in SPEs.
  • Findings offer design strategies to enhance ion conductivity for advanced energy storage applications.