Publikace detail

Investigation of Temperature Dependence of Adsorption of Water from Aqueous Acetonitrile on Silica Based Stationary Phases

Autoři: Bartó Endre | Kiss Ibolya | Jandera Pavel | Felinger Attila

Rok: 2015

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Investigation of Temperature Dependence of Adsorption of Water from Aqueous Acetonitrile on Silica Based Stationary Phases	The Cogent Silica-C and Cogent Phenyl Hydride colums have a silicon hydride surface (silica hydride) with less than 2% free silanol group, therefore they do not have strong association with water and other solvents and will not have the expected hydration shell of ohter silica based columns. Excess adsorption of water from aqueous acetonitrile mobile phase in different temperatures was investigated on mentioned stationary phases using the frontal analysis method and coulometric Karl-Fischer titration. The adsorption behaviors of water on the mentioned stationary phases were modeled by Langmuir isoterm. The preferentially adsorbed water was expressed in terms of hypotetical monolecular water layer equivalent in the inner pores. The uptake of water slightly depends on the teperature. Less than one monomolecular water layer equivalents was adsorbed on both stationary phases at every temperature. Phenyl Hexyl stationary phase shows decreased uptake un comparison to Silica-C stationary phase	Temperature; stationary phases; water layer

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