Abstract: The invention relates to a device through which a fluid can flow and that has a cellular structure, a system for modular optimization of cellular structures, and also a method for producing such structures. The device through which a fluid can flow comprises a working range with a cellular structure. The cellular structure has a shape and/or dimensions such that, with respect to a monolithic device with at least two channels that have a rectangular cross section, the thermal conductivity is greater and/or the flow resistance is lower and/or the mechanical resistance, in particular, the compressive and/or tensile resistance, is higher and/or the temperature stability is higher.

Abstract: A method for the surface treatment of bead polymers is to be prepared, by means of which bead polymers are treated in a particularly simple and effective manner such that upon addition to unfinished ceramic pieces, in particular, their strength and dimensional stability increase. To this end, the bead polymers are conducted to a device which is used for comminution, in particular, to a mill, in which the surface of the bead polymers is purposefully scratched or roughened in a uniformly mechanical manner.