| Abstract
| - An improved condensation model for the estimation of pore-size distribution in the range of nanometersis examined. In the authors' previous paper, the model proved its reliability in computer experimentsemploying the molecular dynamics technique. The model is tested here in a real experimental system witha MCM-41-like ordered mesoporous silicate, FSM-16. The study includes how to find the adsorbate−solidinteraction strength, which is taken into account as an additional contribution for condensation other thanthe Kelvin effect. The true pore size of the material is separately determined to be 3.2 ± 0.2 nm byhigh-resolution transmission electron microscopy observation, and by a “colloidal particle adsorption method”.The conventional model for condensation, the Kelvin model, underestimates the pore size of FSM-16 tobe 2.5 nm from the nitrogen isotherm. The present model successfully predicts the pore size to be 3.4 nm,and proves its reliability in the real experimental system. The effect of the pore wall's potential on thecapillary coexistence relation is further discussed comparing ordered mesoporous silicates and the usualsilica materials.
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