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Related Concept Videos

Ion Exchange01:17

Ion Exchange

663
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...
663
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

779
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

15.0K
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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Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

982
The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
982
Intermolecular Forces03:13

Intermolecular Forces

61.2K
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...
61.2K
Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

33.6K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
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Updated: Sep 13, 2025

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
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Aqueous Ion Mobility over a Broad Concentration Range.

Tian Huang1, Setare Mostajabi Sarhangi2, Steve Granick1

  • 1University of Massachusetts, Department of Polymer Science and Engineering, Amherst, Massachusetts 01003, USA.

Physical Review Letters
|July 31, 2025
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations and NMR measurements reveal that ion diffusion slows with increasing concentration due to memory relaxation time, not approximations. This finding clarifies the interplay of electrostatic and osmotic forces in concentrated solutions.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Biophysics

Background:

  • Lithium phosphate solutions are relevant to biochemical processes (H2PO4-) and battery technology (Li+).
  • Understanding ion diffusion in concentrated solutions is crucial for various applications.

Purpose of the Study:

  • To compare molecular dynamics simulations with pulsed-field gradient NMR measurements of ion diffusion in LiH2PO4 solutions.
  • To investigate the relationship between electrostatic and osmotic forces and their impact on ion transport.
  • To explain the concentration-dependent translational diffusion of ions.

Main Methods:

  • Explicit-water molecular dynamics simulations of LiH2PO4 solutions.
  • Pulsed-field gradient nuclear magnetic resonance (NMR) measurements of ion diffusion.
  • Analysis of electrostatic and osmotic forces and their relaxation times.

Main Results:

  • A compensation effect was observed between electrostatic and osmotic forces influencing ion diffusion.
  • The Kirkwood equation was found to hold with exact solutions but violated with traditional approximations.
  • Slower translational diffusion at higher ion concentrations was attributed to a growing memory relaxation time.

Conclusions:

  • The study explains concentration-dependent ion diffusion as a dynamical effect of memory relaxation time.
  • Dynamical correlations between force components lead to concentration-independent total force variance and relaxation time.
  • The findings reconcile simulation and experimental data for concentrated LiH2PO4 solutions.