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We report the effect of rank and lithotype on the wettability of coal in microfluidic experiments in two types of artificial microchannels: (1) reactive ion etched (RIE) channels and (2) die-cast channels prepared by pressing powdered lithotype concentrates. Five coals from the Bowen Basin with ranks in the Rmax% range 0.98–1.91% were examined. Contact angles and entry pressures of air and water in...