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Related Concept Videos

Intermolecular Forces03:13

Intermolecular Forces

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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...
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Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

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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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Ionic Association01:28

Ionic Association

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Electrolytes: van't Hoff Factor03:08

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Colligative Properties of ElectrolytesThe 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 dissolved...
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Ion Exchange01:17

Ion Exchange

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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...
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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Modulating multivalent ion interaction in angstrom-scale confinement through solvent environment.

Xiaolin Yue1, Mingzhan Wang1,2, Dongchen Ying1

  • 1Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA. chongliu@uchicago.edu.

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Summary
This summary is machine-generated.

Solvent composition controls ion behavior in angstrom-scale nanochannels. Tuning solvent mixtures enables selective rare-earth element (REE) separation by influencing ion uptake and dynamics.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Ion-solvent interactions become complex at the angstrom-scale (Å-scale) due to water's unique properties.
  • Understanding solvent effects on ion behavior in confined environments is crucial but largely unexplored.
  • Functionalized two-dimensional (2D) materials offer a platform to study these Å-scale phenomena.

Purpose of the Study:

  • To investigate how solvent environment regulates ion dynamics, uptake, and selectivity in Å-scale nanochannels.
  • To use rare-earth elements (REEs) as a model system to probe solvent-mediated ion separation.
  • To elucidate the mechanisms behind solvent-controlled ion behavior in 2D nanochannels.

Main Methods:

  • Utilized functionalized two-dimensional molybdenum disulfide (2D MoS2) nanochannels.
  • Systematically tuned solvent composition to observe effects on ion behavior.
  • Employed dynamic tests and analyzed binding-site deprotonation and dielectric effects.

Main Results:

  • Ion uptake and selectivity are governed by solvent-dependent acidity and dielectric properties.
  • Maximum ion uptake occurred at intermediate solvent ratios balancing acidity and dielectric effects.
  • Dimethylformamide-rich systems showed shifted selectivity towards heavier REEs due to increased deprotonation.

Conclusions:

  • Solvent composition is a critical factor for tuning ion behavior and separation in 2D nanochannels.
  • Mechanistic insights into solvent-mediated selective REE recovery and separation were provided.
  • Findings offer a pathway for designing advanced separation technologies based on solvent engineering.