Atomic Force Micrographs

I research a lot of photographs for college chemistry textbooks.  My new favorite images are atomic force micrographs (AFM for short).  An AFM provides a 3D profile of the surface on a nanoscale, by measuring the force between a sharp probe and surface at very short distance.  The probe is supported on a flexible cantilever. The AFM tip “gently” touches the surface and records the small force between the probe and the surface.  Above are two examples from Oxford Scientific.
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