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Hydrophobic Interactions between Dissimilar Surfaces

Yoon1, Flinn, Rabinovich

  • 1Center for Coal and Minerals Processing, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061-0258

Journal of Colloid and Interface Science
|January 15, 1997
PubMed
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Atomic force microscopy revealed distinct hydration forces on untreated silica surfaces and long-range hydrophobic forces on surfaces treated with octadecyltrichlorosilane (OTS). Hydrophobic force constants combine like Hamaker constants, predictable by contact angle.

Area of Science:

  • Surface science
  • Colloid and interface science
  • Materials science

Background:

  • Understanding surface forces is crucial for predicting material interactions in various environments.
  • Hydration forces and hydrophobic forces govern interfacial phenomena between surfaces in aqueous media.
  • Quantifying these forces is essential for applications in nanotechnology, biomaterials, and microelectronics.

Purpose of the Study:

  • To measure and compare surface forces between glass and silica surfaces under different hydrophobicity conditions.
  • To investigate the applicability of combining rules for asymmetric hydrophobic interactions.
  • To establish a relationship between hydrophobic forces and surface wettability (contact angle).

Main Methods:

  • Utilized atomic force microscopy (AFM) to probe forces between a silica sphere and a silica plate.

Related Experiment Videos

  • Performed measurements on both untreated (hydrophilic) and octadecyltrichlorosilane (OTS)-treated (hydrophobic) surfaces.
  • Conducted experiments with surfaces of similar and dissimilar hydrophobicities to derive empirical combining rules.

    • Main Results:

    • Observed short-range hydration forces (0.4 and 3.0 nm decay lengths) on untreated surfaces.
    • Detected long-range hydrophobic forces (2-32 nm decay lengths) on OTS-treated surfaces.
    • Found that hydrophobic force constants for asymmetric interactions approximate the geometric mean of symmetric interactions, similar to Hamaker constants.
    • Demonstrated a unique correlation between hydrophobic force constants and water contact angles.

    Conclusions:

    • Hydrophobic forces are uniquely determined by the water contact angle of the surfaces.
    • Empirical combining rules, analogous to those for Hamaker constants, can be applied to hydrophobic force constants for asymmetric interactions.
    • The findings facilitate the prediction and estimation of hydrophobic forces in complex interfacial systems.