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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2020

Extension and Limits of Cryoscopy for Nanoconfined Solutions

Résumé

This work investigates the phase behavior of aqueous solutions of glycerol confined in MCM-41 and SBA-15 nanoporous matrixes by calorimetry. Limitations due to overfilling and eutectic freezing are prevented by the absence of an external liquid reservoir and by the glassforming property of glycerol. Consequently, the stability of nanoconfined ice in equilibrium with aqueous solutions is studied over a wide range of compositions. In confinement, a large temperature depression of the liquidus line is observed. A thermodynamic model accounting simultaneously for the cryoscopic and the Gibbs-Thomson effects gives a consistent view of the phase diagram for large pores (Rp = 4.15 nm). For smaller pores (Rp = 1.8 nm), it reveals that the water activity strongly deviates from the bulk solution with the same composition, indicating the possible role of concentration heterogeneities in determining the onset of ice freezing in strongly nanoconfined solutions.
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Dates et versions

hal-02883916 , version 1 (03-07-2020)

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Benjamin Malfait, Alban Pouessel, Aicha Jani, Denis Morineau. Extension and Limits of Cryoscopy for Nanoconfined Solutions. Journal of Physical Chemistry Letters, 2020, 11 (14), pp.5763-5769. ⟨10.1021/acs.jpclett.0c01564⟩. ⟨hal-02883916⟩
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