Key points are not available for this paper at this time.
Ordered macroporous structures have been produced by templating echinoid (sea urchin) skeletal plates. Results are summarized that describe how the CaCO3 plates that form the test of the sea urchin provide excellent templates for producing porous structures. This extremely general method has been used in this case to create gold with 15 μm pores (see Figure).
Seshadri et al. (2000) studied this question.