Physico-chemical study of aqueous solutions of electrolytes in mixed solvents

Micellar Parameters of Aqueous Solutions of Tween 20 and 60 at Different Temperatures: Volumetric and Viscometric Study

“…The higher positive values of B for T60 suggest the greater kosmotropic effect in aqueous solutions of this surfactant, and then more solute-solvent interactions in the case of T60. It is interesting that the values of dB/dT obtained for the post micellar region are equal to −0.36 and −0.17 for T20 and T60, respectively, and also, previous literature [42] indicates that this solute is a structure maker. It should be mentioned that when the surfactant aggregate forms, the released water molecules in the vicinity of the hydrophobic part of the molecule become bulk water.…”

“…On the other hand, as non-electrolytes with the hydrophilic 3-hydroxyl group, they have a high affinity for water and are 17 for T20 and T60, respectively, and also, previous literature [42] indicates that this solute is a structure maker. It should be mentioned that when the surfactant aggregate forms, the released solutions of T20 at a given T (Figure 3 (Figure 1).…”

Studies on Molecular Interactions of Some Electrolytes in Water by Volumetric and Viscometric Measurments at <i>T</i>= (303.15 to 323.15 K)

“…We can classify MgCl 2 and Mg(NO 3 ) 2 acts as structure maker in aqueous solution. Haque et al [15] noticed that dB/dT value is negative for MgCl 2 in methanol. These are in excellent agreement with the conclusions drawn from [∂ϕ 0 v 2 /∂T 2 ] p as discussed earlier.…”

“…On the other hand, the values of the Bcoefficient for MgCl 2 and Mg(NO 3 ) 2 in aqueous solution increase with the rise in temperature, thereby showing the ion-solvent interactions further improve with the increase in temperature. Recently it has been emphasized by many workers that dB/dT is a better criterion [15] for determining the structure making/breaking nature of any electrolyte rather than simply the B-coefficient. The values of dB/dT were calculated from the slope of the curve obtained by plotting the B-coefficient value against temperatures and these values are given in Table 4.…”

Influence of polyvinylpyrrolidone on the interaction between water and methanol

“…These works were interested in the effect of an added impurity on the viscosity (Oleinikova et al, 1997;Huque et al, 2006;Zhao et al, 2006;Wang et al, 2004;Haldar andDas, 2008), conductivity (El. Dossoki, 2010), molar volume (Zhao et al, 2006), and density (Huque et al, 2006) of the binary liquid mixture. However, the effect on the microscopic structure of the binary liquid mixture was not taken into account, and only phenomenological interpretations were reported.…”