Properties of aqueous solutions of nonionic surfactants, Triton X-114 and Tween 80, at temperatures from 293 to 318K: Spectroscopic and ultrasonic studies

Temperature Effect on the Adsorption and Volumetric Properties of Aqueous Solutions of Kolliphor®ELP

“…where B is the is pre-exponential factor and a E is shear activation energy. The calculated from Equation (7) values of a E (Figure 4), that is energy necessary for individual micelles motion in an environment of surrounding micelles determined on the basis of this law, increases significantly at As the ELP molecules are strongly hydrated by water, and it is possible that the H3O + ions can be associated to the oxyethylene groups, similarly to other nonionic surfactants studied by us [15,[22][23][24][25], it was also interesting to analyze the viscosity data according to the Jones-Dole equation and A and B coefficients [26,27].This equation and the relationship between   0. Figure 7) for C equal to and higher than 5 × 10 −3 M, where r  is the relative viscosity, were used for the determination of B coefficients values which proved to be positive (Figure 8), disclosing the waterstructure-breaking nature of the ELP molecules.It is interesting that the value of / dB dT , which by some authors is designed as a better criterion for determining any solute effect on the structure of solutions depending on temperature [28], for the studied concentrations of ELP solutions, is equal to −0.21, and according to Hugue et al [28], indicates that the solute is a structure maker.…”

“…As the ELP molecules are strongly hydrated by water, and it is possible that the H 3 O + ions can be associated to the oxyethylene groups, similarly to other nonionic surfactants studied by us [15,[22][23][24][25], it was also interesting to analyze the viscosity data according to the Jones-Dole equation and A and B coefficients [26,27]. This equation and the relationship between (η r − 1)C −0.5 and C 0.5 (Figure 7) for C equal to and higher than 5 × 10 −3 M, where η r is the relative viscosity, were used for the determination of B coefficients values which proved to be positive (Figure 8), disclosing the water-structure-breaking nature of the ELP molecules.…”

Macroscopic and Microscopic Properties of Some Surfactants and Biosurfactants

“…On the other hand, the micellization process should be connected with the surfactant molecules interactions through the water phase and their Gibbs free energy ( ) should be close to . The values were calculated from Equation (18) for RL, SF, OGP, DDGP, DM, SDM, SLM, T20, T60, and T80 [ 47 , 50 , 52 , 53 ]. It proved that the calculated values are close to the ones ( Table 9 ).…”

“…Therefore the purpose of our study was to consider the interactions of the monorhamnolipid (RL), surfactin (SF), n -octyl-β- d -glucopyranoside (OGP), n -dodecyl-β- d -glucopyranoside (DDGP), n -dodecyl-β- d -maltoside (DM), sucrose monodecanoate (SMD), sucrose monododecanoate (SML), Tween 20 (T20), Tween 60 (T60), and Tween 80 (T80) molecules through the water phase as well as their interactions with polymers (polytetrafluoroethylene (PTFE), polyethylene (PE), poly(methyl methacrylate) (PMMA), polyamide (nylon 6)) and quartz through the water phase in light of the Gibbs free energy of adsorption and micellization. The studies of these interactions are based on the results obtained by us at temperature (T) equal to 293 K and published earlier [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ].…”

Influence of Mixed 6-Thioguanine-Nonionic Surfactant Adsorption Layers on Kinetics and Mechanism of Bi(III) Ion Electroreduction

“…It is worth mentioning that the Bi-6-thioguanine type complex plays a key role as 6-thioguanine dominates in reaching Table 2 The values of current and potential of SWV peaks of 1 × 10 −3 mol • dm −3 Bi(III) ion electroreduction in 2 mol • dm −3 chlorates(VIII) in the presence of 1 × 10 −3 mol • dm −3 6thioguanine and the increasing concentrations of Triton X-100 the adsorption equilibria of the studied mixtures, and what is more, it adsorbs specifically on the electrode surface [18], whereas Tween 80 and Triton X-100 adsorb physically [6,[19][20][21]. With the increasing concentration of surfactants in the electrolyte solution in the presence 1 × 10 −3 mol • dm −3 It should be also emphasized that the stages of dehydration and formation of active complexes in the multi-step Bi(III) ion electroreduction are much faster than those of electron transfer [22,23].…”