Fig. 2: Wetting dynamics of the ferrofluid droplet.
From: Exploiting ferrofluidic wetting for miniature soft machines
a Images of ferrofluid droplets (2 μL) on different substrates (hydrogel, glass, resin, polymethyl methacrylate (PMMA), metal (copper), silicone) at 0 min and 20 min after the dripping. b The overlapped body profiles of ferrofluid droplets on different substrates as the uniform magnetic field strength is increased from magnetic field off to 9 mT. The red arrow indicates the direction of the magnetic field. Color bar represents normalized magnetic field strength. c The morphology of a ferrofluid droplet at different moments when it is added to a silicone substrate. Color bars represent normalized heights. d Time evolution of the contact angle of ferrofluid droplets on different substrates. See Supplementary Data File 1 for source data for the graph. e The quantitative pulling off strength of ferrofluid droplets to different surfaces. See Supplementary Data File 2 for source data for the graph. All the suspending phase is water. Scale bars, 1 mm.
