Spreading of Nonvolatile Liquids in a Continuum Picture

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Paper Details

Title: Spreading of Nonvolatile Liquids in a Continuum Picture

Authors: F. Brochard-Wyart, J.M. di Meglio, D. Quere, P.G. de Gennes

Journal: Langmuir, 7 (1991), pgs. 335-338

Introduction and Fundamental Parameters

This paper focuses on the wetting criteria for solid-liquid interfaces where the long-range interaction is not oscillating and is described by a Hamaker constant (A). The two key parameters are the Hamaker constant and the spreading coefficient (S) which contains contributions from short range interactions. Three fundamental regimes are considered:

1) Complete wetting - a small droplet spreads to become a flat "pancake" surrounded by a dry solid

2) Pseudo-partial wetting - a droplet forms a spherical cap with a finite contact angle but - the surrounding solid is "wet" - i.e. the drop is in equilibrium with a molecular film

3) Partial wetting - the contact angle is nonzero and the solid around the drop is "dry"



Complete Wetting

Partial Wetting

Conclusion