Surface properties are crucial to many atmospheric heterogeneous chemical processes including homogeneous nucleation, cloud activation, particle growth at relative humidities below deliquescence, and reactions on particle surfaces. Recently we developed BET-like isotherms of solutions and surfaces that are accurate over the full range of concentration, from infinitely dilute to pure solute. The solution isotherms model solutes as surfaces that sorb solvent. Similar to hydration models, multiple solvent layers are needed to accurately simulate solution behavior.  But a key difference between our isotherms and typical hydration models is that the outermost sorbed layer interacts with inner layers and with bulk solvent, which alters the entropy term from that in prior models. In this talk, we will present recent progress including equations for surface concentration of solute and physical interpretation of model parameters.

Isotherms for modeling solutions and surfaces

248th National Meeting (2014)

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