Mesoporosity experimental results

The whole adsorption / desorption isotherms at 300 K, 350 K, 400 K, 500 K, and 650 K are plotted in Fig 3 Oefi panel) (normalized to the sur ce area of the substrate exposed to water vapor, in pmol / m ). The result is given as a function of the chemicai potentiai of water imposed by the GCMC simulation instead of pressure to avoid the introduction of uncertainties in conversion. It is important to note that this chemical mtential does not contain the ideal rotational contribution -kT(-4.09+3/2ln1), witii T in Kelvin. The high temperature (650 K) isotherm is reversible (supercritical), whereas the low temperature cases present large hysteresis (type IV isotherm in tiie lUPAC classification). The steep rises are associated to the capillary condensation of water in tiie mesoporosity of the Vycor ass. These simulation results are in qualitative agreement with experimental data, witii an asymmetric adsorption / desorption hysteresis characteristic of disordered and intercormected pores. ... 

---