Fig. 4
From: Magnetically tunable bidirectional locomotion of a self-assembled nanorod-sphere propeller
Reconfiguration, cargo transport, and miniaturization. a, b Superimposed sequence of images showing the controlled release (a) and pickup (b) of a spherical colloid by the propelling nanorod (B0 = 3.4 mT, ν = 20 Hz). In the first case, the pair was separated by applying a perpendicular field B z = 8 mT that induces repulsive dipolar interactions, see Supplementary Movie 3. c Sequence of images demonstrating the multicargo transport by one nanorod via attractive dipolar forces (B0 = 4.7 mT, ν = 20 Hz) (Supplementary Movie 4). d Average speed of the train versus number of particles in the chain. Error bars are the standard deviation of the measurements. e, f Transport of the microparticles according to the two mechanisms by a thinner nanorod having length l = 3.0 μm and diameter d = 100 nm. e shows locomotion with nanorod in front (B0 = 4.7 mT, ν = 20 Hz), f with nanorod on the back (B0 = 5.8 mT, ν = 20 Hz). See corresponding Supplementary Movie 5. Scale bars in all images are 5 μm
