Fluctuating Clouding Behavior in Mixed Micellar Solutions

Abstract

The clouding behavior of mixed surfactant (Triton X-114/sodium dodecyl sulfate) systems, as manifested by solution turbidity, was studied over a range of concentrations and temperatures. The results were correlated with particle size data obtained from dynamic light scattering measurements. Fluctuating behavior, involving clouding at relatively low temperatures, (partial) clarification upon further heating ("declouding"), and definitive clouding at still higher temperatures, was observed. The temperature ranges and solution compositions producing declouding were found to coincide roughly with a previously reported preclouding phenomenon. In this, clouding occurs in two stages, starting with a relatively stable colloidal suspension displaying a Tyndall effect, and proceeding to full clouding at higher temperatures. Both preand declouding were found to be promoted by the presence of anionic sodium dodecyl sulfate in the micellar Triton X-114 solution. A modified charge accumulation mechanism is proposed to account for the fluctuations.

Determination of estrogens in water by HPLC–UV using cloud point extraction

“…TritonX-114 with a cloud point temperature of 23 or 24 • C [19,20] is one of the most commonly used non-ionic surfactants in the cloud point extraction [20]. There are several different parameters that can influence the extraction efficiency.…”

Unique role of β-cyclodextrin in modifying aggregation of Triton X-114 in aqueous solutions

“…Nonionic surfactant aqueous solutions have shown complex phase behavior including liquid-liquid phase separation above a certain temperature known as the cloud point. [1][2][3][4][5][6][7] It is believed that the phase behavior is related to the surfactant aggregates, such as micelles, vesicles, and lamellae, as well as the interactions between them. To correlate the change of the macroscopic phase behavior with the transformation of the surfactant aggregates, different physical techniques including static and dynamic light scattering, 1,8 turbidimetry, 3,4 fluorescence spectroscopy, 7 smallangle neutron scattering, 9 and rheo-optical instruments [10][11][12][13][14][15] have been used.…”

Interactions Between Cationic Gemini Surfactants and Nonionic Surfactant in Aqueous Solutions

“…On the other hand, nonionic surfactants which consist of an alkyl chain as hydrophopic moiety and polyoxyethylene ether (POE) chain as hydrophilic moiety are widely used as an agent to solubilize and emulsify processes in the textile, detergent and cosmetic industries. The solubility of non-ionic surfactants in aqueous solution is due to the high hydration of oxyethylene chains [10], [11]. Brij series are widely used in many practical applications.…”