Toluene Solubilization Induces Different Modes of Mixed Micelle Growth

Abstract

The effect of toluene solubilization on the size and mobility of Triton X100 (TX100) micelles and TX100/sodium dodecyl sulfate (SDS) mixed micelles was studied by turbidimetry, dynamic light scattering, and capillary electrophoresis. Micelle growth due to toluene solubilization was observed for both surfactant systems; however, two different modes of growth were seen. Mixed micelles in 0.1 M NaCl are spherical (apparent diameter d(app) = 8 nm) and remain so while taking up 3 mM toluene, with a volume increase per micelle of deltaV(m) = 50 nm3. In 0.5 M NaCl, the large d(app) of both nonionic and mixed micelles (14 and 24 nm, respectively) indicate ellipsoidal or rodlike shapes, and their large increases in d(app) upon addition of 3 mM toluene thus correspond to elongational growth, with the same deltaV(m) = 50 nm3. Further addition of toluene to TX100/SDS in 0.5 M NaCl results in a dramatic increase in micelle size followed by an unexpected bimodal size distribution. The addition of excess toluene leads to the formation of ca. 140 nm toluene droplets, stabilized mainly by monomers of the high critical micelle concentration surfactant, SDS. These microemulsions coexist with the smaller (20 nm) swollen mixed micelles.

Innovation in Draw Solute for Practical Zero Salt Reverse in Forward Osmosis Desalination

“…Moreover, the micelle size distribution of aqueous solutions containing 0.07 M EDTA-2Na and 0.5 mM Triton X-100 surfactants as depicted in Figure 8b indicates the formation of the large micellar particles with mean size of 18.4 nm, which is much bigger than the measured micelle sizes of 8.5 nm for Triton X-100 reported by others. 46,47 Therefore, it is clearly seen that coupling Triton X-100 into EDTA-2Na draw solute can increase the particle size and improves the efficiency of recovery draw solution.…”

Adsorption of surfactant micelles and Cd2+/Zn2+ in micellar-enhanced ultrafiltration

“…The results showed that the quantity of micelles increased with increasing Cd 2+ /Zn 2+ concentration in the feed. It is well known that increasing the cation concentration causes repulsive forces between the head groups, and the formation of micelles becomes easier [37,38]. The increase in Cd 2+ /Zn 2+ concentration caused more SDS molecules to be present in micellar form.…”

Solubilization of Aromatic Hydrocarbons in Ethylene Oxide‐Propylene Oxide Triblock Micelles: Location of Solubilizate and its Effect on Micelle Size from 2D NMR and Scattering Techniques

“…Toluene solubilization in ethoxylated tert-octylphenol micelles showed micelle growth and large oil droplets with excess of toluene [33]. Solubilization of naphthalene and pyrene in polyoxyethylene sorbitan monooleate micelles and mixed micelles with SDS was investigated by Mohamed and Mahfoodh [34] and discussed in terms of surfactant-surfactant interaction occurring within the solubilization site of the organic solute.…”