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Adsorption calorimetry was used to develop a method for determining the surface area of lowsurface-area materials (< 1 m2/g), which required no pretreatment of the surface, such as outgassing at elevated temperatures. The method involved flowing heptane through a small amount of sample (0.15 to 1.0 g) in the flow cell of a commercial microcalorimeter. When thermal equilibrium was reached at the powder-heptane interface, pure heptane was replaced with a heptane carrier-solution containing 0.6doi:10.1346/ccmn.1990.0380413 fatcat:dwkdafsgavduxg7pzyxmnvz6ji