Thin film wrinkling: A solid-liquid interface instability

Abstract eng:
When a small mercury (Hg) droplet is gently placed on a gold (Au) thin film deposited on a glass substrate, a complex process ensues. The spreading of the Hg on the Au substrate under the action of an uncompensated Young force and the simultaneous penetration of the Hg through the Au film via intergranular penetration comprise the first part of the process. This penetration allows Hg to reach the Au/ glass interface. The sustained transport of Hg from the drop on top of the film to the Au/ glass interface, and its subsequent flow along this interface serve to delaminate the Au film from the glass substrate and comprises the second part of the process. The delaminated film is unstable to wrinkling and secondary finger-like growth of the wrinkles.

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