Investigation of interfacial properties of aqueous two-phase systems by density gradient theory. Dedicated to Prof. Sabine Enders on her 50th birthday and in honor of her previous scientific impact

Andres Kulaguin Chicaroux, Tim Zeiner

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

In this work the interfacial properties of aqueous two-phase systems (ATPS) consisting of an aqueous solution of polyethylene glycol (PEG) and dextran with different molar masses were investigated. To calculate the interfacial properties the density gradient theory was combined with the lattice cluster theory and the Wertheim association theory. With help of this thermodynamic model the liquid-liquid equilibria of the investigated ATPS were calculated in a molar mass range of PEG from 4000 to 20,000. g/mol and of dextran from 10,000 to 500,000. g/mol; whereas the thermodynamic model was fitted to the phase equilibrium in several selected ATPS. Phase equilibria in all other systems were predicted in a good accordance with experimental data. On the basis of the modelled phase equilibria the interfacial tension was calculated by the density gradient theory in an excellent agreement with experimental data. Moreover, the concentration profile of the phase forming components across the interface was calculated and it could be seen that there is no accumulation of any component in the interface and that the length of interfacial region depends on PEG molar mass.

Originalspracheenglisch
Seiten (von - bis)135-142
Seitenumfang8
FachzeitschriftFluid phase equilibria
Jahrgang407
DOIs
PublikationsstatusVeröffentlicht - 12 Mär 2015

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binary systems (materials)
Molar mass
Phase equilibria
Polyethylene glycols
Dextran
Dextrans
glycols
polyethylenes
gradients
dextrans
Thermodynamics
Liquids
thermodynamics
Surface tension
liquids
Association reactions
interfacial tension
aqueous solutions
profiles

Schlagwörter

    ASJC Scopus subject areas

    • !!Chemical Engineering(all)
    • !!Physical and Theoretical Chemistry
    • !!Physics and Astronomy(all)

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    Investigation of interfacial properties of aqueous two-phase systems by density gradient theory. Dedicated to Prof. Sabine Enders on her 50th birthday and in honor of her previous scientific impact. / Chicaroux, Andres Kulaguin; Zeiner, Tim.

    in: Fluid phase equilibria, Jahrgang 407, 12.03.2015, S. 135-142.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    abstract = "In this work the interfacial properties of aqueous two-phase systems (ATPS) consisting of an aqueous solution of polyethylene glycol (PEG) and dextran with different molar masses were investigated. To calculate the interfacial properties the density gradient theory was combined with the lattice cluster theory and the Wertheim association theory. With help of this thermodynamic model the liquid-liquid equilibria of the investigated ATPS were calculated in a molar mass range of PEG from 4000 to 20,000. g/mol and of dextran from 10,000 to 500,000. g/mol; whereas the thermodynamic model was fitted to the phase equilibrium in several selected ATPS. Phase equilibria in all other systems were predicted in a good accordance with experimental data. On the basis of the modelled phase equilibria the interfacial tension was calculated by the density gradient theory in an excellent agreement with experimental data. Moreover, the concentration profile of the phase forming components across the interface was calculated and it could be seen that there is no accumulation of any component in the interface and that the length of interfacial region depends on PEG molar mass.",
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    AB - In this work the interfacial properties of aqueous two-phase systems (ATPS) consisting of an aqueous solution of polyethylene glycol (PEG) and dextran with different molar masses were investigated. To calculate the interfacial properties the density gradient theory was combined with the lattice cluster theory and the Wertheim association theory. With help of this thermodynamic model the liquid-liquid equilibria of the investigated ATPS were calculated in a molar mass range of PEG from 4000 to 20,000. g/mol and of dextran from 10,000 to 500,000. g/mol; whereas the thermodynamic model was fitted to the phase equilibrium in several selected ATPS. Phase equilibria in all other systems were predicted in a good accordance with experimental data. On the basis of the modelled phase equilibria the interfacial tension was calculated by the density gradient theory in an excellent agreement with experimental data. Moreover, the concentration profile of the phase forming components across the interface was calculated and it could be seen that there is no accumulation of any component in the interface and that the length of interfacial region depends on PEG molar mass.

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