The behavior of interfacial liquids adsorbed alone or co-adsorbed as miscible or
immiscible pairs or triples strongly differs from that for bulk liquids because of several effects,
and the main of them is the confined space effect. In the confined space of pores the
mobility of molecules decreases, the activity of solvents is reduced, and the freezing temperature
decreases. This can lead to the separation of bulk-miscible liquids into weakly miscible
or immiscible structures in pores. The pore size distributions and the chemistry of pore
walls affect the interfacial behavior of adsorbates because these factors can enhance differentiation
of co-adsorbed liquids. These effects were analyzed upon co-adsorption of water
and a set of organic solvents, acids, and polymers onto a variety of adsorbents including chars, activated carbons,
fumed oxides, silica gels, and porous polymers using low-temperature 1H NMR spectroscopy, differential
scanning calorimetry, thermally stimulated depolarization current, thermogravimetry, adsorption, infrared
and Raman spectroscopies, SEM, TEM, and quantum chemical methods.
Keywords: Activated carbons, freezing point depression, fumed oxides, interfacial water, lowtemperature 1H NMR spectroscopy, pore size distribution, silica gels, thermally stimulated depolarization
current, water/organics co-adsorption.
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