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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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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.
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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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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Electrolyte Permeability in Plastic Ice VII.

Fausto Martelli1,2

  • 1IBM Research Europe, Hartree Centre, WA4 4AD Daresbury, U.K.

The Journal of Physical Chemistry. B
|July 20, 2023
PubMed
Summary
This summary is machine-generated.

Plastic ice VII allows electrolytes to permeate, forming deep brines crucial for potential life on ocean worlds. This diffusion process is key to understanding planetary aqueous reservoirs and exobiology.

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Area of Science:

  • Planetary Science
  • Geophysics
  • Astrobiology

Background:

  • Deep brines are essential for habitability in water-rich planets.
  • Electrolytes diffuse through dense ice layers like ice VII and plastic ice VII.

Purpose of the Study:

  • Investigate electrolyte diffusion in plastic ice VII under planetary conditions.
  • Determine the impact of electrolytes and molecular rotations on plastic ice VII's properties.

Main Methods:

  • Classical molecular dynamics simulations.
  • Simulated alkali (Li+, Na+, K+) and halide (F-, Cl-) ions in plastic ice VII.
  • Modeled conditions relevant to super-Earths, icy moons, and ocean worlds.

Main Results:

  • Plastic ice VII is permeable to electrolytes on geological timescales.
  • Diffusion occurs via void jumps, governed by molecular rotations, with Na+ exhibiting unique lattice substitution.
  • Bulk modulus of plastic ice VII is sensitive to molecular rotation speed and electrolyte concentration.

Conclusions:

  • Plastic ice VII facilitates brine development in water-rich planets and ocean worlds.
  • Findings have significant implications for exobiology and the chemical evolution of planetary aqueous reservoirs.