Free-Ended Gel with Wave-Shaped Surfaces

6 Free-Ended Gel with Wave-Shaped Surfaces 

Different from gel (a), gel (b) bent along the ditches. The gel (c) bent along y-axis, the same direction of the ditch on extending surface. The gel (d) also bent along y-axis, but the difference of two curvatures of each direction was larger than that of gel(c). In this way, the ideas were checked, of shape design improved controllability (Conjecture 1), and the gel with wave-shaped surface bend along 

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