Abstract
We analytically study the stability of catenoids pinned at one contact line, with the other free to move on a substrate subject to axisymmetric and nonaxisymmetric perturbations. A variational formulation is applied to derive the corresponding stability criteria. The maximal stability region and the stability region are represented in the favorable and canonical phase diagrams, providing a complete description of catenoid equilibrium and stability. All catenoids are stable with respect to nonaxisymmetric perturbations. For a fixed contact angle, there exists a critical volume below which catenoids are unstable to axisymmetric perturbations. Equilibrium solution multiplicity is discussed in detail, and we elucidate how geometrical symmetry is reflected in the maximal stability and stability regions.
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