Bestimmung der Oberflächengrösse und Struktur poröser Substanzen durch Messung der physikalischen Adsorption II. Adsorption von Argon über und unter der Schmelzpunktstemperatur und Zustand des Adsorptionsfilms

Isothermal adsorption studies and the measurement of dimensional changes below the bulk freezing point of the adsorbate indicate that substances adsorbed in porous solids are unable to freeze in situ. The difference between the vapour pressure or free energy of the unfrozen adsorbate and that of the bulk adsorptive outside of the porous system is resolved by a desorption process; the desorbed matter freezes outside of the system while the vapour pressure of the adsorbate remaining in the pores decreases through meniscus formation. Mechanical breakdown of the system occurs only then, when this process cannot be completed and an equilibrium state is not attained. This mechanism was found to be valid for porous silica glass, hydrated cement paste, bricks, and even for biological substances such as animal and plant tissue, and foodstuff. This understanding has led to the development of new methods for testing the durability of building materials, clarification of some problems of the BET surface area determination method and it suggests an explanation for the action of cryoprotective agents. I.

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Bestimmung der Oberflächengrösse und Struktur poröser Substanzen durch Messung der physikalischen Adsorption II. Adsorption von Argon über und unter der Schmelzpunktstemperatur und Zustand des Adsorptionsfilms

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