Adsorption of cationic surfactants on covered hanging mercury drop electrode surface of variable area

► Mercury droplets with substrates of CTAB and CDBACl are expanded. ► The expanding of the droplets results in a reorientation of the adsorbed molecules. ► Condensed films are observed. ► Surfactant layers maintain their defect-free characteristics during expansion in most of the cases. ► A fractal structure is observed in one system.