Figure 4.

The map of the center-to-center distance between positions I and III. Map of the center-to-center distance between positions I and III (A,C) in Figure 3 at x-y distance away and rotated by an angle φ to the x-axis. The inability to self-retract to the original starting position is evident.

Ng et al. Nanoscale Research Letters 2012 7:185   doi:10.1186/1556-276X-7-185
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