Interaction between Ionic and Nonionic Surfactants in the Adsorbed Film and Micelle:  Hydrochloric Acid, Sodium Chloride, and Tetraethylene Glycol Monooctyl Ether

Abstract

The aqueous solutions of hydrochloric acid−tetraethylene glycol monooctyl ether (C8E4) and sodium chloride−C8E4 mixtures were investigated to examine the interaction between inorganic ions and nonionic surfactants both in the adsorbed film and micelle. Their surface tension was measured as a function of the total molality of the inorganic electrolyte and C8E4 mixture and the composition of C8E4. The results of surface tension measurement were analyzed by our thermodynamic procedure, and the phase diagrams of adsorption and micelle formation were drawn. By comparing the phase diagrams of these systems, it was been that the Na+ ions do but Cl- ions do not interact with the ethylene oxide group of the C8E4 molecule. This finding leads us to the conclusion that the attractive interaction observed in the dodecylammonium chloride−C8E4 system reported previously is caused by ion−dipole interaction or hydrogen bonding between the dodecylammonium ion and oxygen atom of the ethylene oxide group of the C8E4 molecule.

Effect of the Head Group of Surfactant on the Miscibility of Sodium Chloride and Surfactant in an Adsorbed Film and Micelle

“…4 into Eqs. [6] and [8] and are shown as a function ofX 2 at constant γ together with theˆ H . Furthermore, taking into acccount the dependence ofX H 2 on γ in Fig.…”

“…In contrast to this idea, however, we have applied the thermodynamic treatment of surfactant mixtures to the sodium chloride, NaCl, and dodecylammonium chloride (DAC) mixture and clarified the miscibility of NaCl and DAC in the adsorbed film and micelle (5). Furthermore, the treatment has been applied to the NaCl and tetraethylene glycol monooctyl ether (C 8 E 4 ) mixture to elucidate an origin of the strong nonideal interaction between ionic and nonionic surfactants in the adsorbed film and micelle (6).…”

“…Judging from the affinity of the polar head groups of the nonionic surfactants having the common octyl chain for water molecule estimated from the CMC of the surfactants (6,13,14), the magnitude of the hydration of the head group seems to be in the order DePO > OMS > C 8 E 4 . Hence, it is concluded that the less the head group of surfactant molecule is hydrated in the adsorbed film, the closer Na + and Cl − can come to the head group.…”

A Review of Recent Studies on Aqueous Binary Mixed Surfactant Systems

“…Whether the measured values for a sample solution scatter in disorder or not, depends in most cases on the chemical species (especially on the structure) or its concentration. Aratono and his coworkers who have developed the drop volume method in collaboration with Yamashita Giken have reported that the accuracy of this drop volume method has been confirmed to be sufficiently high from comparison with the results determined by the most reliable method of image analysis of pendant drop 41) .…”

The role of charged surfactants in the thermal and structural properties of lyotropic liquid crystalline mesophases of [Zn(H2O)6](NO3)2?CnEOm?H2O

“…The fundamental question is how one can increase the metal ion density to 6-7 metal ion/C n EO m mole ratios without disturbing the LC phase. It is known that charge surfactants, such as CTAB and SDS can be used together with the non-ionic surfactants or Pluronics in the LLC mesophases and micelle phases [19][20][21][22][23][24][25]. The hydrophobic interactions (among alkyl chains of both charged and non-ionic surfactants) and the hydration of the alky tail-ethylene oxide interface with the help of a charged head group enable the assembly of two or three surfactants into a single mesophase.…”