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The Surface Geometry of Vycor

Mitropoulos1, Makri, Kanellopoulos

  • 1Institute of Physical Chemistry, National Center for Scientific Research "Demokritos", 153 10 Ag. Paraskevi Attikis, Greece

Journal of Colloid and Interface Science
|September 1, 1997
PubMed
Summary

Vycor porous glass exhibits a fractal surface (D≈2.5) when dry. Adding even a small amount of water (3% w/w) transforms it into a smooth hydrogel, obscuring the fractal nature.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Understanding the surface geometry of porous materials like Vycor glass is crucial for applications.
  • The interface between solid porous structures and adsorbed fluids influences material properties.

Purpose of the Study:

  • To investigate the interface geometry of Vycor porous glass.
  • To determine the effect of water adsorption on the surface structure.

Main Methods:

  • Adsorption of water onto Vycor porous glass.
  • Small-angle X-ray scattering (SAXS).
  • Small-angle neutron scattering (SANS).

Main Results:

  • Dry Vycor glass displays a fractal surface with a fractal dimension (D) of approximately 2.5.

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  • Upon water adsorption, a soft hydrogel forms, leading to a diffuse interface.
  • Thorough drying is essential for observing the fractal surface.
  • As little as 3% w/w water is sufficient to smooth the surface.

    • Conclusions:

    • The surface morphology of Vycor porous glass is highly sensitive to hydration.
    • Water adsorption significantly alters the interface, transitioning from a fractal to a smooth boundary.
    • Precise control over sample hydration is necessary for characterizing the intrinsic fractal properties of Vycor glass.