Bornian theories

Bornian theory of the Gibbs free energy of ion resolvation, a vast amount of work dealing with ion solvation and resolvation could not fully be reviewed. The reader is referred to some books [2-5] and review articles [6-10] for a general survey. 

VII. NON-BORNIAN THEORY OF THE RESOLVATION ENERGY OF IONS A. Theoretical Model... 

In the present non-Bornian theory it should be noted again that the long-range electrostatic interactions of an ion with solvents in the second and further solvation shells are ignored. However, the electrostatic energies should contribute to a considerable extent to the solvation energies of ions in each phase. Nevertheless, the proposed equations for... 

Based on the above-mentioned experimental and theoretical findings, we have proposed a new, non-Bornian theory of Aof ions [49]. In this theory, it is assumed that a hydrophilic ion which is selectively hydrated in organic solvent transfers across the O/W interface as the hydrated ion, and a hydrophobic ion which is not hydrated in the O phase transfers as a bare ion, as depicted in Fig. 9. 

As seen in Table 2, the order of the magnitude of rjj for alkali metal ions is the reverse of that of the magnitude of r. This means that a more hydrophilic ion has a larger rji. However, this fact does contradict the expectation from Bornian electrostatic theories. As can be seen in the Born equation [Eq. (2)], it is expected that the larger the radius an ion has, the more positive the value the ion has, that is, the more hydrophobic it... 

Then we made a new approach that recognizes short-range interactions of a hydrated ion with solvents. By this approach, Afor hydrophilic ions could be elucidated on the basis of the proposed model in Fig. 8 (see Section VII). A similar model was also employed by Sanchez et al. [47] to elucidate Afor some hydrophilic ions, but using a Bornian electrostatic theory. 

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