Pine Research Group
Lock and Key Colloids

Watch lock-&-key particles selectively bind (left) and form ball-&-socket flexible joint (right)

FIG. 1. Movie from optical microscope showing the binding of a spherical “key” colloidal particle to a “lock” (or “pacman”) particle. The pacman particles are approximately 2 micrometers in diameter. [Quicktime required]

FIG. 2. Close-up from end of the movie in Fig. 1 showing two locks bound to a single key yielding a flexible joint. [Quicktime required]