Hydrophobicity and thermodynamic response for aqueous solutions of amphiphiles

Influence of amphiphilic molecules on the peroxidase-like behavior of nanoparticles in an aqueous solution

“…It has been shown that various thermodynamic properties of TBA aqueous solutions presented different extents of anomaly around the molar fraction of TBA being 0.04 (mass fraction being 0.15), which was attributed to the formation of a microscopic heterogeneous structure. [19][20][21] Thus, most TBA molecules may be presented in the aggregates and it is easier for the aqueous solution to retain the equilibrium between the free cation radical from the one-electron oxidation of TMB and the charge transfer complex, giving more one-electron catalytic oxidation product (blue color one with maximum absorbance wavelength at 652 nm). Therefore, A 652 nm /A 450 nm showed a slight increase around the mass fraction of TBA being 0.15, where the aggregate concentration reached a maximum.…”

Effect of hydrophobic phenomena over the volumetric behavior of aqueous ionic liquid solutions

“…Two paramount examples of this kind of molecules are 2butoxyethanol and tert-butanol, both extensively studied using a wide variety of techniques [4][5][6][7][8][9][10][11][12][13][14][15][16]. This behavior has been explained as a consequence of the dual, amphiphilic nature of these compounds.…”

“…The appearance of these nanosegregated structures has an impor-tant effect over the thermodynamics of these systems. Anomalies in properties as enthalpy, volume, or heat capacity have been found for many of these solutions, [12][13][14][15][16] being the strongest located around the concentration threshold where the aggregation starts to take place. This singular behavior is especially manifested for large order derivatives of the thermodynamic potential.…”

“…This singular behavior is especially manifested for large order derivatives of the thermodynamic potential. Thus, maxima or minima versus composition have been found for many amphiphile aqueous solutions in the partial molar volume and enthalpy and in their derivatives against mole number of the amphiphile [12,13], and in partial molar heat capacity [14,15].…”

The effect of 2,2,2-trifluoroethanol on water studied by using third derivatives of Gibbs energy, G

“…Similar trends have been observed recently for alkyl-amines. 5,6 We realized that just as for alkyl carboxylate anions, 7 the hydrophilic end is hydrated with probably a single H2O molecules and leaves the bulk H2O away from the hydrated hydrophilic end unperturbed, which leaves the hydrophobic end to interact with H2O hydrophobically. Typical hydrophiles such as urea and glycerol show the…”