We investigate the draining of a vertical magnetic soap film in the presence of a strong, nonuniform magnetic field. A colloidal suspension of magnetic nanoparticles in a regular soap solution yields a magnetic soap solution, from which a soap film is formed across an isolated frame. Experiments demonstrate that with a strong magnet placed above the frame, the film may be made to flow upward against gravity. The amount of film draining upward is altered by varying the distance between the frame and magnet. A first mathematical model is developed for the evolution of the film. Simulations demonstrate qualitative agreement with the experiment.
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