Unidirectional Droplet Propulsion onto Gradient Brushes without External Energy Supply.

13 Moreover, the average velocities are spread out with small variations and no indication of a clear trend ( Figure 4 b) that would indicate that a larger stiffness gradient would lead to more efficient durotaxis motion exists, which has been the case for other substrate designs. 13 Moreover, since the motion is most efficient when the softest part consists of fully flexible chains ( k θ = 0 ε/rad 2 ) m

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