  We analyze theoretically complete wetting of a substrate supporting an array
of parallel, vertical plates which can tilt elastically. The adsorbed liquid
tilts the plates, inducing clustering, and thus modifies the substrate
geometry. In turn, this change in geometry alters the wetting properties of the
substrate and, consequently, the adsorption of liquid. This geometry-wetting
feedback loop leads to stepped adsorption isotherms with each step
corresponding to an abrupt change in the substrate geometry. We discuss how
this can be used for constructing substrates with tunable wetting and
adsorption properties.
