Description:

For many years, researchers of materials have been keenly interested in porous materials with three-dimensional periodicity for their potential applications in photonic crystals, chemical sensors, catalysts, and membranes. The porous cylindrical structures shown here at various magnifications, is formed by filling a microcapillary with colloidal particles.  These particles assemble into closely packed crystalline structure.  The spaces in this "crystal" are then filled by another fluid which solidifies, then the particles are dissolved away, leaving behind the porous structure seen above.  This method allows very regular 3-D pores to be created.

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