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Interpersonal attraction is a fundamental psychological phenomenon influencing human relationships across various contexts. It refers to one person's positive feelings or interests toward another, serving as the foundation for friendships, romantic partnerships, familial bonds, and professional relationships. The nature of interpersonal attraction extends beyond romantic connections, shaping interactions in both short-term and long-term social engagements.Psychological Foundations of...
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Related Experiment Video

Updated: Jan 22, 2026

Drawing and Hydrophobicity-patterning Long Polydimethylsiloxane Silicone Filaments
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Drawing and Hydrophobicity-patterning Long Polydimethylsiloxane Silicone Filaments

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The long-range attraction between hydrophobic macroscopic surfaces.

Patrick Kékicheff1

  • 1Université de Strasbourg, C.N.R.S. Institut Charles Sadron, 23 rue du Loess, Strasbourg Cedex 2, 67034, France.

Advances in Colloid and Interface Science
|July 6, 2019
PubMed
Summary

The attractive force between hydrophobic surfaces in water originates from electrostatic interactions, not capillary bridging. Surface microstructuring and ion adsorption explain this attraction, which is stronger than dispersion forces.

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Area of Science:

  • Surface Science
  • Physical Chemistry
  • Colloid Science

Background:

  • Macroscopic hydrophobic surfaces exhibit strong attractive forces in aqueous solutions.
  • Previous studies were often confounded by capillary bridging forces from submicroscopic bubbles.
  • Understanding these forces is crucial for various applications, including materials science and nanotechnology.

Purpose of the Study:

  • To reexamine the attractive forces between macroscopic hydrophobic surfaces in aqueous solutions, excluding capillary bridging.
  • To elucidate the molecular mechanisms underlying these forces using recent experimental and theoretical insights.
  • To determine the origin and scaling of the interaction energy.

Main Methods:

  • Direct force measurements between hydrophobic surfaces in well-defined geometries (crossed-cylinders, sphere-flat, sphere-sphere).
  • Elimination of interferences like electrical double layer, hydrodynamics, and capillary bridging.
  • Utilizing Surface Force Apparatus with X-ray Solution Scattering (SFAX) under controlled nano-confinement.

Main Results:

  • The interaction energy scales as exp(-2κD)/2κD at large separations, with decay lengths half the Debye screening length (κ⁻¹/2).
  • The prefactor A scales with ionic strength, indicating an electrostatic origin for the attraction.
  • Microstructuring of adsorbed films and ion adsorption/fluctuations are key to the attraction's magnitude, exceeding dispersion forces.

Conclusions:

  • The long-range attraction between hydrophobic surfaces in electrolyte solutions is electrostatic in origin.
  • Surface inhomogeneities and ion adsorption dynamics on hydrophobic layers are critical for the observed strong attraction.
  • A single master curve describes the interaction energy across different hydrophobic surface types.