Abstract
SummaryThe Brunauer, Emmett and Teller (BET) method for estimating specific surface areas of adsorbents that is widely applied in food science and engineering operations has been shown to be expressed in wrong dimensional units and this explains the wide discrepancy, of several orders of magnitude, often observed between specific water and N2 surface areas of adsorbents when using the BET method. A method based on Caurie's unimolecular adsorption theory predicts the specific water and N2 surface areas in the same units and in their correct order of magnitude which for cornstarch equals, respectively, 258.88 and 169.86 m2 g−1 compared to BET estimates of 283.60 m2 g−1 for water and only 0.73 m2 g−1 for N2.
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