We can distinguish helix from braid by using the stereo TEM. The figure above shows two TEM images with the tilted angle 7° apart. Using these two stereograms, we can see the 3-D appearance of the sample object, and thus determine the relative depths of three strands in the nanorope. By superimposing the two images of stereo pair shown in the previous figure, the entwisting nanorope in this figure is indeed a right-handed triple helix instead of a braid.
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