Mesoporous diamond spherical particles for HPLC column packing materials

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Micrometer-sized porous diamond spherical particles (PDSPs) were fabricated from nanodiamond (ND) particles using spray drying and microwave plasma-assisted chemical vapor deposition (MPCVD). Nitrogen gas sorption measurement revealed that the PDSP fabricated from 5 nm detonation ND particles had a BET surface area of ca. 300m2/g and a narrow pore diameter distribution around 10 nm. On the other hand, PDSP fabricated from ND particles with diameters from 20 to 50 nm showed the average pore diameter of 4.6–9.3 nm, which should be based on the interparticle space of the NDs. The PDSP surface was modified with octadecyl groups using a photochemical method. A column packed with the modified PDSP was successfully employed in a reverse phase high performance liquid chromatography (HPLC) column, and the successful separation of organic compounds was demonstrated with a water/acetonitrile mixture mobile phase.