| http://www.w3.org/ns/prov#value | - e.g., another set of particles. [0038]FIG. 15 is a side view of a capillary or microchannel in a housing, which housing comprises a porous barrier. [0039]FIG. 16 is a side view of a capillary or microchannel comprising an integral or formed porous barrier made from a set of particles.
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