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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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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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Water adsorption on the LaMnO3 surface.

Chris R Billman1, Yan Wang1, Hai-Ping Cheng1

  • 1Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA.

The Journal of Chemical Physics
|February 15, 2016
PubMed
Summary
This summary is machine-generated.

Water adsorption on LaMnO3 surfaces shows strong surface-molecule interactions, promoting wetting. Even a monolayer exhibits bilayer characteristics with distinct layer properties due to substrate interactions.

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Area of Science:

  • Surface science
  • Materials science
  • Computational chemistry

Background:

  • Understanding surface-adsorbate interactions is crucial for materials applications.
  • LaMnO3 is a complex oxide with potential catalytic and electronic properties.
  • Water adsorption significantly influences surface behavior.

Purpose of the Study:

  • Investigate water adsorption on metallic LaMnO3 surfaces.
  • Characterize the electronic structure of adsorbed water configurations.
  • Determine the nature and strength of surface-water interactions.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Analysis of electronic structure: density of states, charge density, crystal orbital overlap populations.
  • Simulated scanning tunneling microscopy (STM) and vibrational spectra.

Main Results:

  • Water monomer, dimer, trimer, and monolayer adsorption were studied.
  • Surface-water interactions are stronger than intermolecular hydrogen bonding, leading to surface wetting.
  • Adsorbed water exhibits strong hydrogen bonds with shifted OH stretch modes.
  • A water monolayer shows signs of bilayer formation with distinct layer characteristics.

Conclusions:

  • LaMnO3 surfaces readily interact with water molecules, facilitating wetting.
  • Strong hydrogen bonding in adsorbed water impacts vibrational properties.
  • The substrate significantly influences the structure and properties of adsorbed water layers.