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Related Concept Videos

Adsorption Isotherms II01:25

Adsorption Isotherms II

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Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
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Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
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Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed...
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The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
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Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing of pharmaceutical products. After a drug is ingested or injected, it is typically involved in several chemical equilibria that affect its ultimate concentration in the body system of interest. Knowledge of the quantitative aspects of these equilibria is required to compute a dosage amount that will solicit the desired therapeutic effect.
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Computational Insights into the Relationship Between Solution Concentration and Adsorption Energy.

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Corrosive ions like chloride and sulfur interact with metals, influencing material failure. Increased ion concentration slightly raises metal work function, strengthening interactions and affecting electrochemical reactions.

Keywords:
DFT calculationadsorption energyaggressive ionssolution concentrationwork function

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Corrosion Science

Background:

  • Electrochemical interactions between ions and metals are critical in corrosion.
  • Understanding these interactions is key to preventing material failure.

Purpose of the Study:

  • To investigate the effect of aggressive ion concentration on metal surfaces.
  • To elucidate the role of solution dielectric properties in adsorption phenomena.

Main Methods:

  • Langmuir adsorption isotherm modeling.
  • Calculation of work function and adsorption energy for Cl and S on Al and Cu.
  • Simulation of dielectric properties using implicit solvent models.

Main Results:

  • Surface coverage remained stable with increasing ion concentration.
  • Increased concentration enhanced electrostatic shielding but did not significantly alter adsorption energy.
  • Metal work function increased by 20-90 meV with concentration, dependent on metal and surface orientation.

Conclusions:

  • Increased ion concentration strengthens adsorbate-substrate interactions via work function changes.
  • These interactions influence the electrochemical reaction kinetics of metals.
  • Dielectric properties play a mediating role in ion adsorption and surface behavior.