Measurements, correlations and thermodynamic modeling of aqueous two-phase systems of polyvinylpyrrolidone (PVP) + sulfate/citrate salts

Pirdashti, Mohsen; Heidari, Zahra; Arzideh, Seyyed Mohammad; Khoiroh, Ianatul

doi:10.1080/01932691.2023.2272749

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“…This makes the formation of the solution (water + salt + surfactant) more unfavorable, resulting in lower quantities of the components required to favor the process of phase separation. 53,54 Regarding the decrease in the hydrophobicity, it reduces the affinity of the surfactant for water, making it less easily salted out by the inorganic salt. 55,56 As a consequence of these effects, it is not possible to evaluate the effects of MM and hydrophobicity independently for surfactants of the Triton series.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The increase in the MM of the surfactant decreases the configurational entropy of the solution (water + salt + surfactant), reducing the contribution of Δ mix S to the variation of the Gibbs free energy of the mixture. This makes the formation of the solution (water + salt + surfactant) more unfavorable, resulting in lower quantities of the components required to favor the process of phase separation. , Regarding the decrease in the hydrophobicity, it reduces the affinity of the surfactant for water, making it less easily salted out by the inorganic salt. , As a consequence of these effects, it is not possible to evaluate the effects of MM and hydrophobicity independently for surfactants of the Triton series. However, it is possible to deduce which effect is dominant.…”

Section: Resultsmentioning

confidence: 99%

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Liquid–Liquid Equilibrium of Aqueous Two-Phase Systems Formed by Nonionic Surfactants (Triton X-100, Triton X-165, or Triton X-305), Salts (NaNO₃ or KNO₃), and Water at Different Temperatures

Figueiredo,

Neves,

Mageste

et al. 2024

J. Chem. Eng. Data

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Liquid−liquid equilibrium data for aqueous twophase systems (ATPSs) formed by nonionic surfactants , inorganic salts (NaNO 3 or KNO 3 ), and water were obtained at 298.2, 313.2, or 328.2 K. For all the ATPSs studied, the upper phase was rich in surfactant, while the lower phase was rich in salt. The biphasic region increased with increasing temperature, which was associated with the reduced hydration of the hydrophilic portion of the surfactant micelles at higher temperatures. The cation K + induced phase segregation more efficiently than the cation Na + , unlike the results usually reported in the literature for systems formed by polymers and salts based on the same cations. This result showed the dependence of the cation effect on the properties of the other component forming the system. The potential of phase segregation among the different surfactants was in the order Triton X-305 > Triton X-165 > Triton X-100, which was determined by the effect of molar mass overcoming the effect of hydrophobicity of the surfactant to determine the immiscibility region of the ATPS. The consistency of the equilibrium data was confirmed using the Bancroft and Othmer−Tobias correlations.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Liquid–Liquid Equilibrium of Aqueous Two-Phase Systems Formed by Nonionic Surfactants (Triton X-100, Triton X-165, or Triton X-305), Salts (NaNO₃ or KNO₃), and Water at Different Temperatures

Figueiredo,

Neves,

Mageste

et al. 2024

J. Chem. Eng. Data

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Measurements, correlations and thermodynamic modeling of aqueous two-phase systems of polyvinylpyrrolidone (PVP) + sulfate/citrate salts

Cited by 1 publication

References 45 publications

Liquid–Liquid Equilibrium of Aqueous Two-Phase Systems Formed by Nonionic Surfactants (Triton X-100, Triton X-165, or Triton X-305), Salts (NaNO₃ or KNO₃), and Water at Different Temperatures

Liquid–Liquid Equilibrium of Aqueous Two-Phase Systems Formed by Nonionic Surfactants (Triton X-100, Triton X-165, or Triton X-305), Salts (NaNO₃ or KNO₃), and Water at Different Temperatures

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Measurements, correlations and thermodynamic modeling of aqueous two-phase systems of polyvinylpyrrolidone (PVP) + sulfate/citrate salts

Cited by 1 publication

References 45 publications

Liquid–Liquid Equilibrium of Aqueous Two-Phase Systems Formed by Nonionic Surfactants (Triton X-100, Triton X-165, or Triton X-305), Salts (NaNO3 or KNO3), and Water at Different Temperatures

Liquid–Liquid Equilibrium of Aqueous Two-Phase Systems Formed by Nonionic Surfactants (Triton X-100, Triton X-165, or Triton X-305), Salts (NaNO3 or KNO3), and Water at Different Temperatures

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Liquid–Liquid Equilibrium of Aqueous Two-Phase Systems Formed by Nonionic Surfactants (Triton X-100, Triton X-165, or Triton X-305), Salts (NaNO₃ or KNO₃), and Water at Different Temperatures

Liquid–Liquid Equilibrium of Aqueous Two-Phase Systems Formed by Nonionic Surfactants (Triton X-100, Triton X-165, or Triton X-305), Salts (NaNO₃ or KNO₃), and Water at Different Temperatures