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Water cluster formation at the liquid/vapor interface is confirmed by experimental force-distance curves. These interfacial water clusters expand over time, exhibiting unique dielectric properties.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Materials Science

Background:

  • Cluster formation near solid surfaces is accepted.
  • The existence of water clusters at the liquid/vapor interface remains debated.
  • Understanding interfacial water structure is crucial for various scientific disciplines.

Purpose of the Study:

  • To experimentally investigate the presence and characteristics of water clusters at the liquid/vapor interface.
  • To analyze the structural and dielectric properties of interfacial water on different surfaces.
  • To determine the temporal evolution of interfacial water structures.

Main Methods:

  • Experimental force vs distance measurements on water attached to hydrophobic and hydrophilic surfaces.
  • Analysis of nanosized steps in force-distance curves to characterize water cluster profiles.
  • Investigation of the dielectric permittivity profile of interfacial water.

Main Results:

  • Nanosized steps in force-distance curves indicate the presence of water cluster profiles.
  • Interfacial water structures expand over time, from ~1 nm initially to ~70 nm.
  • Interfacial dielectric permittivity exhibits an oscillating profile, differing from homogeneous bulk water.
  • Low dielectric permittivity clusters extend into the bulk water, resembling expanding water networks.

Conclusions:

  • Experimental evidence supports the existence of water cluster formation at the liquid/vapor interface.
  • Interfacial water exhibits dynamic structural expansion and complex dielectric behavior.
  • The observed phenomena suggest a network-like behavior of interfacial water structures that evolve over time.