Abstract
Accurate particle densities of the Cu-based metal organic framework [Cu(4,4'-bipyridine)2(BF4)2] for He, N2 and CH4 molecules using the high-pressure buoyancy method have been determined. A smaller probe molecule gave a larger particle density (1.70 g/ml from He, 1.66 g/ml from N2, 1.60 g/ml from CH4). The effect of particle density on the evaluation of the surface excess mass for supercritical gas adsorption was examined; the above particle density difference gave rise to a 2–4% difference in the surface excess mass.
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