Thermodynamic properties of aqueous polypropylene oxide 400 solutions from isopiestic measurements over a range of temperatures

Sadeghi, Rahmat; Ziamajidi, Fatemeh

doi:10.1016/j.fluid.2006.09.028

Cited by 29 publications

(25 citation statements)

References 38 publications

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“…In the present case, when the temperature is raised the PPG becomes more hydrophobic60 and therefore the hydrogen bonding interactions between the oxygen atoms contained in the ether groups of the polymeric chain and the water molecules are weakened. In this regard, the temperature rise not only may cause an increase in the mobilized water content to produce ABS‐promoting [C 4 mim]Br‐water interactions but also can decrease the [C 4 mim]Br‐PPG interactions due to the exclusion of hydrophobic PPG from the hydration shell of [C 4 mim]Br, so that [C 4 mim]Br could exhibit its ABS‐forming capability as much as possible.…”

Section: Resultsmentioning

confidence: 69%

A new aqueous biphasic system containing polypropylene glycol and a water‐miscible ionic liquid

Zafarani-Moattar

Hamzehzadeh

Nasiri

2011

Biotechnology Progress

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In this work, we proposed a novel aqueous biphasic system (ABS) composed of polypropylene glycol P400 (PPG P400) and hydrophilic ionic liquids (IL), 1-alkyl-3-methylimidazolium bromide (alkyl = ethyl or butyl), forming an upper polymer-rich phase and a lower IL-rich phase at ambient temperature. This new ABS can present interesting characteristics shared by ILs and polymers such as low volatility, good solvation ability, tunable physical properties, and high design capacity for achieving task-specific phase components to enhance the partitioning of target species. Ternary phase diagram of the novel ABS formed by PPG 400 and [C(2) mim]Br in water was measured at T = 298.15 K. Factors affecting the binodal curves such as the cation side alkyl chain length and the temperature were also evaluated. The results were successfully interpreted in terms of the kosmotropic/chaotropic nature of ILs. Furthermore, the phase behavior of the PPG-[C(2) mim]Br ABS is described by the NRTL model. Finally, the extraction potential of the proposed ABS was evaluated through its application to the extraction of the essential amino acids such as L-tryptophan and L-tyrosine. The partition coefficients here obtained demonstrated the fine potential of the proposed ABS for biomolecules separation.

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Section: Resultsmentioning

confidence: 69%

A new aqueous biphasic system containing polypropylene glycol and a water‐miscible ionic liquid

Zafarani-Moattar

Hamzehzadeh

Nasiri

2011

Biotechnology Progress

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“…For this purpose, first, the model parameters between the segments of the polymer and water, (A sw and A ws ), have been obtained from the correlation of water activity data for the {PPG400 + H 2 O} system at different temperatures [40,41]. The model parameters between salt and water, (A ca,w and A w,ca ), were also obtained by fitting the experimental water activity data for the {tri-sodium citrate + H 2 O} system at different temperatures [42].…”

Section: Correlation Of Tie-line Datamentioning

confidence: 99%

“…For the {PPG 400 + sodium citrate / citric acid} ABS, the model parameters (τ sw and τ ws ) have been obtained from the correlation of water activity data for aqueous PPG400 binary system at T = 298.15 K [40,41]. Then, using the obtained (τ sw and τ ws ) parameters and the equilibrium condition, Eq.…”

Section: Correlation Of Tie-line Datamentioning

confidence: 99%

Phase separation in aqueous solutions of polypropylene glycol and sodium citrate: Effects of temperature and pH

Hamzehzadeh

Zafarani-Moattar

2015

Fluid Phase Equilibria

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“…In fact, thermodynamic study of aqueous electrolyte solutions shows that the temperature has only minute effect on the water activity of aqueous electrolyte solutions. However, water activity of aqueous polymer solutions increases with increasing temperature [30][31][32][33]. Similar to the aqueous surfactant solutions, vapor pressure depression of both of binary aqueous electrolyte and aqueous polymer solutions increase with increasing temperature [30,33].…”

Section: Resultsmentioning

confidence: 93%

Vapor-liquid equilibrium properties of sodium n-heptyl sulfonate in Water and in aqueous solutions of poly(ethylene glycol) at different temperatures

Sadeghi

Hosseini

2010

JICS

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The vapor-liquid equilibria properties of sodium n-heptyl sulfonate (C 7 SO 3 Na) in pure water and in aqueous poly(ethylene glycol) (PEG) solutions were determined at different temperatures below and above the critical micelle concentration (CMC). Vapor-liquid equilibrium data such as water activity, vapor pressure, osmotic coefficient, activity coefficient and Gibbs free energies were obtained through isopiestic method. The concentration dependence of all investigated thermodynamic properties exhibit a change in slope at the concentration in which micelles are formed. It was found that the vapor pressure depression for a ternary aqueous C 7 SO 3 Na + PEG system is more than the sum of those for the corresponding binary solutions and, at higher temperatures, the higher concentration of PEG is in equilibrium with a certain concentration of surfactant.

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Thermodynamic properties of aqueous polypropylene oxide 400 solutions from isopiestic measurements over a range of temperatures

Cited by 29 publications

References 38 publications

A new aqueous biphasic system containing polypropylene glycol and a water‐miscible ionic liquid

A new aqueous biphasic system containing polypropylene glycol and a water‐miscible ionic liquid

Phase separation in aqueous solutions of polypropylene glycol and sodium citrate: Effects of temperature and pH

Vapor-liquid equilibrium properties of sodium n-heptyl sulfonate in Water and in aqueous solutions of poly(ethylene glycol) at different temperatures

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