Activity Coefficients for the Systems Water-Urea and Water-Urea-Sucrose at 25° from Isopiestic Measurements<sup>1</sup>

Ellerton, H. David; Dunlop, Peter J.

doi:10.1021/j100878a023

Cited by 110 publications

(69 citation statements)

References 8 publications

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“…16 Using the current statistical thermodynamic model (eq 23) to fit these data, a single parameter G 2,m is sufficient to obtain an excellent representation of the data up to 12 mol/kg and a good fit up to the solubility limit. That is, only one nonideal term (pairwise interaction) is required to fit the data with a high degree of precision over a large concentration range (lower dashed line).…”

Section: Resultsmentioning

confidence: 99%

Statistical Thermodynamic Approach to the Chemical Activities in Two-Component Solutions

et al. 2004

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It is shown how the leading terms of a semi grand canonical partition function (GCPF) can be used to develop analytic expressions relating activity to concentrations in two-component systems. The simple analytic expressions for activity coefficients can be fitted to activity coefficient versus concentration data for a wide range of aqueous solute systems. Only one or two parameters are required to accurately describe the activity coefficients of nonelectrolyte and electrolyte aqueous solute systems over their entire range of solubility. These forms derive from low-order number expressions of the GCPF that take into account the effective solvent interactions with the solute and between solute molecules for a variable amount of solvent. The GCPF leading terms and fitting parameters define apparent solute-solute oligomerization and solute packing phenomena that increase with solute concentration. Advantages using this grand canonical approach versus previous approaches are discussed.

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Section: Resultsmentioning

confidence: 99%

Statistical Thermodynamic Approach to the Chemical Activities in Two-Component Solutions

et al. 2004

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“…Experimental data for solutions with other CSs considered in this work were taken from literature (glycerol [23] glycine [35], DMSO [10], MG [36], TMG [37], urea [38], and ectoine [12]). …”

Section: Conversion Of Osmotic Coefficients Into Activity Coefficientsmentioning

confidence: 99%

Compatible solutes: Thermodynamic properties relevant for effective protection against osmotic stress

Held

Sadowski

2016

Fluid Phase Equilibria

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“…Thus with respect to aqueous solutions at 298 K containing alkyl ureas, Barone et al comment 15 on the possible association of solutes but leave open the question of accounting for trends in practical osmotic coefficients; see also comments by Ellerton and co-workers. 26,27 The merit of this model over the Stokes-Robinson approach is the potential for describing solute-solute interactions in terms of attractiverepulsive solute-solute interactions.…”

Section: Figmentioning

confidence: 99%

Activity of water in aqueous systems; A frequently neglected property

et al. 2005

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In this critical review, the significance of the term 'activity' is examined in the context of the properties of aqueous solutions. The dependence of the activity of water(,) at ambient pressure and 298.15 K on solute molality is examined for aqueous solutions containing neutral solutes, mixtures of neutral solutes and salts. Addition of a solute to water(,) always lowers its thermodynamic activity. For some solutes the stabilisation of water(,) is less than and for others more than in the case where the thermodynamic properties of the aqueous solution are ideal. In one approach this pattern is accounted for in terms of hydrate formation. Alternatively the pattern is analysed in terms of the dependence of practical osmotic coefficients on the composition of the aqueous solution and then in terms of solute-solute interactions. For salt solutions the dependence of the activity of water on salt molalities is compared with that predicted by the Debye-Hü ckel limiting law. The analysis is extended to consideration of the activities of water in binary aqueous mixtures. The dependence on mole fraction composition of the activity of water in binary aqueous mixtures is examined. Different experimental methods for determining the activity of water in aqueous solutions are critically reviewed. The role of water activity is noted in a biochemical context, with reference to the quality, stability and safety of food and finally with regard to health science.

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Activity Coefficients for the Systems Water-Urea and Water-Urea-Sucrose at 25° from Isopiestic Measurements¹

Cited by 110 publications

References 8 publications

Statistical Thermodynamic Approach to the Chemical Activities in Two-Component Solutions

Statistical Thermodynamic Approach to the Chemical Activities in Two-Component Solutions

Compatible solutes: Thermodynamic properties relevant for effective protection against osmotic stress

Activity of water in aqueous systems; A frequently neglected property

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Activity Coefficients for the Systems Water-Urea and Water-Urea-Sucrose at 25° from Isopiestic Measurements1

Cited by 110 publications

References 8 publications

Statistical Thermodynamic Approach to the Chemical Activities in Two-Component Solutions

Statistical Thermodynamic Approach to the Chemical Activities in Two-Component Solutions

Compatible solutes: Thermodynamic properties relevant for effective protection against osmotic stress

Activity of water in aqueous systems; A frequently neglected property

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Product

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Activity Coefficients for the Systems Water-Urea and Water-Urea-Sucrose at 25° from Isopiestic Measurements¹