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An interface phase transition: complete to partial wetting.

M R Moldover, J W Cahn

    Science (New York, N.Y.)
    |March 7, 1980
    PubMed
    Summary
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    Adding a new component to fluid mixtures near a critical point can change wetting behavior. This strategy can induce a phase transition from complete wetting to incomplete wetting, as shown with methanol-cyclohexane.

    Area of Science:

    • Physical Chemistry
    • Fluid Dynamics
    • Thermodynamics

    Background:

    • Near critical points, fluid phases exhibit unique wetting phenomena.
    • A critical phase can exclude a third phase via a wetting film.

    Purpose of the Study:

    • To investigate strategies for inducing phase transitions in wetting behavior.
    • To explore the shift from complete to incomplete wetting.

    Main Methods:

    • Perturbation of critical point conditions by adding a new component.
    • Experimental observation of wetting film formation and phase behavior.

    Main Results:

    • A simple strategy of adding a component successfully induces a wetting phase transition.
    • The methanol-cyclohexane system demonstrated a shift from complete to incomplete wetting.

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    Conclusions:

    • Adding components is a viable method to control wetting transitions in critical fluid mixtures.
    • This approach offers a general strategy for manipulating interfacial phenomena near critical points.