This invention comprises methods for manufacture, and the manufacture of heap pipes and window materials having particle structures for use in heat transfer applications in which enhanced radiative heat transfer is desired. The structure further allows, in all three configurations, at least one wired connection to be led out from one platform to the other so as to connect at least one item supported by the internal face of the bottom of a platform to at least one other element supported by the internal face of the bottom of the other platform. The pair of substrates and the insulator are provided so as to be slidable.