Mixed Micellization of Polyoxyethylene (20) Oleyl Ether with Cetylpyridinium Chloride at the Air–Water Interface

Abstract

Adsorption and micellization behaviour of binary surfactant mixtures containing a nonionic surfactant, polyoxyethylene (20) oleyl ether (C18‐1E20), and a cationic surfactant, cetylpyridinium chloride (CPC), was studied at the air–water interface using the Wilhelmy plate method. A pseudo‐phase separation model was used to analyse mixed micellization. A Margules equation with one constant (interaction parameter, β) was fitted to the nonideal behaviour of the mixed surfactant system. This system shows synergism (β = −6.0) for micellization. The dynamic behaviour and foamability of binary mixtures at the same bulk concentration and at different mole fractions were also studied using drop volume and horizontal impinging jet methods, respectively. It was found that with an increase in the mole fraction of C18‐1E20, the foamability of a mixture increases and t* value decreases.

Synergism and Interfacial Property Study of Sodium Lauryl Ether Sulfate and Polysorbate 80 at the Air–Water Interface

“…In addition to this, difference in the hydrophobic chain length of SLES and PS80 causes steric interaction that accounts for nonideality. Hence, mixed micellization between SLES and PS80 is favored by both headhead and tail-tail interactions (Desai and Bhagwat, 2016).…”

“…Before these mixtures can be employed in direct applications, their static and dynamic behavior needs to be understood (Desai and Bhagwat, 2016). Dynamic surface tension (DST) is an important property as it governs many industrial and biological processes (Porter, 1991).…”