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Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
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Critical adsorption at silicon surfaces in binary liquid mixtures.

J-H J Cho1, B M Law

  • 1Condensed Matter Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 31, 2005
PubMed
Summary

Preferential adsorption in critical liquid mixtures follows a universal function at oxide surfaces but not always at alkylsilane surfaces. This suggests chemical heterogeneities can impact solid-liquid adsorption behavior.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Thermodynamics

Background:

  • Critical binary liquid mixtures exhibit preferential adsorption at interfaces.
  • This phenomenon is theoretically expected to follow a universal surface scaling function.

Purpose of the Study:

  • To investigate the applicability of a universal surface scaling function to solid-liquid adsorption in critical mixtures.
  • To compare adsorption behavior at different solid-liquid interfaces.

Main Methods:

  • Studied adsorption of aniline from aniline + cyclohexane critical mixture on an oxide-coated Si wafer.
  • Investigated adsorption of n-dodecane from tetrabromoethane + n-dodecane critical mixture on an alkylsilane-coated Si wafer.

Main Results:

  • Aniline adsorption on the oxide surface followed the universal scaling function.
  • n-Dodecane adsorption on the alkylsilane surface did not conform to previously established adsorption functions.

Conclusions:

  • The universal surface scaling function is applicable to certain solid-liquid interfaces in critical mixtures.
  • Chemical heterogeneities on alkylsilane surfaces may explain deviations from universal adsorption behavior.