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The reason has to do with the wettability of the container and the viscosity of the substance.

This concept could therefore offer opportunities for controlling interfacial adsorption even beyond wettability alteration.

Tuning the wettability requires the balance between these surface-tension forces to be manipulated.

Writing in Nature, Li et al.8 report an approach to tune the wettability of chemically robust hydrophilic surfaces by electrically controlling the adsorption and desorption of molecules called surfactants.

The wettability of a solid surface for a particular liquid is determined by the chemical properties of the materials involved.