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Aqueous Solutions and Heats of Hydration02:42

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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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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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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Atomic-resolution three-dimensional hydration structures on a heterogeneously charged surface.

Kenichi Umeda1,2, Lidija Zivanovic3, Kei Kobayashi1,4

  • 1Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo, Kyoto, 615-8510, Japan.

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Researchers visualized atomic-scale hydration structures at solid-liquid interfaces using advanced atomic force microscopy. They discovered unique hydration patterns at step edges on charged surfaces, offering insights into interfacial processes.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Materials science

Background:

  • Understanding local hydration structures at solid-liquid interfaces is crucial for atomic-level insights into physical, chemical, and biological processes.
  • Previous visualization of atomic-scale 3D hydration structures was limited by time-consuming measurements on uneven surfaces.

Purpose of the Study:

  • To investigate local hydration structures on a heterogeneously charged phyllosilicate surface.
  • To overcome experimental difficulties in measuring hydration on uneven surfaces.

Main Methods:

  • Utilized ultra-low noise frequency-modulation atomic force microscopy (FM-AFM).
  • Employed a fast and nondestructive acquisition protocol for 3D hydration structure mapping.
  • Combined experimental data with molecular dynamics (MD) simulations.

Main Results:

  • Discovered intermediate regions with distinct structural hydrations at step edges of the charged phyllosilicate surface.
  • Observed that these intermediate regions exhibit different hydration patterns compared to charged surface regions.
  • Hypothesized that ion depletion at the edges contributes to the observed hydration differences.

Conclusions:

  • The new methodology enables fast and non-destructive mapping of local hydration structures.
  • The findings reveal unique hydration behaviors at step edges on charged surfaces.
  • This research provides crucial insights for understanding and exploring further functionalities of heterostructures.