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Related Concept Videos

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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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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Coupled Interactions at the Ionic Graphene-Water Interface.

Anton Robert1, Hélène Berthoumieux2,3, Marie-Laure Bocquet4

  • 1PASTEUR, Département de chimie, École normale supérieure, Université PSL, CNRS, Sorbonne Université, 75005 Paris, France.

Physical Review Letters
|March 3, 2023
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Summary
This summary is machine-generated.

We developed a self-consistent method to calculate ion adsorption on graphene, matching quantum simulation accuracy. This approach accurately models water-graphene interactions and ion behavior.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Understanding ion adsorption at interfaces is crucial for fields like electrochemistry and materials science.
  • Graphene's unique electronic properties influence interfacial behavior.
  • Accurate modeling of aqueous interfaces remains a computational challenge.

Purpose of the Study:

  • To compute ionic free energy adsorption profiles at the aqueous graphene interface.
  • To develop a self-consistent computational approach for interfacial phenomena.
  • To investigate the role of electronic and dipolar interactions in ion adsorption.

Main Methods:

  • Developed a microscopic model for water.
  • Incorporated graphene's electronic band structure.
  • Evaluated coupled electronic and dipolar electrostatic interactions.
  • Derived the potential of mean force for alkali cations.

Main Results:

  • The self-consistent approach accurately predicts ionic adsorption profiles.
  • The method achieves precision comparable to extensive quantum simulations.
  • Demonstrated the importance of mutual graphene and water screening.
  • Derived the potential of mean force evolution for several alkali cations.

Conclusions:

  • The developed self-consistent method offers a precise and efficient way to study ion adsorption at aqueous graphene interfaces.
  • This approach provides insights into the interplay between electronic structure and solvation effects.
  • The findings are applicable to designing advanced materials and electrochemical systems.