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Modification of the Two-Point Scaling Theory for the Description of the Phase Transition in Solution. Analysis of Sodium Octanoate Aqueous Solutions.

Piekarski H, Wasiak M, Wojtczak L - J Solution Chem (2012)

Bottom Line: The results obtained indicate that the micellization process is subject to the scaling laws.The results were compared with those for other systems.ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s10953-012-9795-6) contains supplementary material, which is available to authorized users.

View Article: PubMed Central - PubMed

ABSTRACT
On the basis of conventional scaling theory, the two-point scaling theory was modified in order to describe the influence of composition on the partial molar heat capacity and volume during the micellization process. To verify the theory, isobaric heat capacities and densities of aqueous sodium octanoate solutions were measured over wide composition and temperature ranges and the modified approach was used to analyze the calculated partial molar heat capacities and volumes of the surfactant in water. The results obtained indicate that the micellization process is subject to the scaling laws. The results were compared with those for other systems. Peculiar behavior of the critical indices was observed and correlated with the structure of the micelles. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s10953-012-9795-6) contains supplementary material, which is available to authorized users.

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Influence of composition on of the apparent, partial and the derivative of apparent molar heat capacities of sodium octanoate in aqueous solution at 353.15 K. Curves represent the best fit of the two-point scaling equations
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Fig6: Influence of composition on of the apparent, partial and the derivative of apparent molar heat capacities of sodium octanoate in aqueous solution at 353.15 K. Curves represent the best fit of the two-point scaling equations

Mentions: To analyze the data, the two-point scaling approach was applied. The apparent and partial molar heat capacities as well as the derivatives of the apparent molar heat capacities were fitted simultaneously to Eqs. 31a, 31b, 30a, 30b and 33a, 33b, respectively, for both phases. The results of this fitting for the four chosen temperatures are shown in Figs. 3, 4, 5, 6 together with the experimental points. The values of the critical indices obtained and other fitting parameters are given in Tables 1 and 2. Fig. 3


Modification of the Two-Point Scaling Theory for the Description of the Phase Transition in Solution. Analysis of Sodium Octanoate Aqueous Solutions.

Piekarski H, Wasiak M, Wojtczak L - J Solution Chem (2012)

Influence of composition on of the apparent, partial and the derivative of apparent molar heat capacities of sodium octanoate in aqueous solution at 353.15 K. Curves represent the best fit of the two-point scaling equations
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3298654&req=5

Fig6: Influence of composition on of the apparent, partial and the derivative of apparent molar heat capacities of sodium octanoate in aqueous solution at 353.15 K. Curves represent the best fit of the two-point scaling equations
Mentions: To analyze the data, the two-point scaling approach was applied. The apparent and partial molar heat capacities as well as the derivatives of the apparent molar heat capacities were fitted simultaneously to Eqs. 31a, 31b, 30a, 30b and 33a, 33b, respectively, for both phases. The results of this fitting for the four chosen temperatures are shown in Figs. 3, 4, 5, 6 together with the experimental points. The values of the critical indices obtained and other fitting parameters are given in Tables 1 and 2. Fig. 3

Bottom Line: The results obtained indicate that the micellization process is subject to the scaling laws.The results were compared with those for other systems.ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s10953-012-9795-6) contains supplementary material, which is available to authorized users.

View Article: PubMed Central - PubMed

ABSTRACT
On the basis of conventional scaling theory, the two-point scaling theory was modified in order to describe the influence of composition on the partial molar heat capacity and volume during the micellization process. To verify the theory, isobaric heat capacities and densities of aqueous sodium octanoate solutions were measured over wide composition and temperature ranges and the modified approach was used to analyze the calculated partial molar heat capacities and volumes of the surfactant in water. The results obtained indicate that the micellization process is subject to the scaling laws. The results were compared with those for other systems. Peculiar behavior of the critical indices was observed and correlated with the structure of the micelles. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s10953-012-9795-6) contains supplementary material, which is available to authorized users.

No MeSH data available.


Related in: MedlinePlus