Authors:

Evan R Williams

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About Paper:

Cetostearyl fatty alcohol is a common additive to consumer products due to its emulsifying abilities improving rheological properties and allowing for a wide range of solubility, however, little research has been done investigating the interactions of cetostearyl alcohol and concentrated aqueous surfactants. The interfacial phase interaction between heterogeneously mixed crystals of cetostearyl fatty alcohol and concentrated aqueous lamellar surfactant solutions was analyzed. A hexagonal liquid crystal phase was observed when a single cetostearyl fatty alcohol crystal was heated to 85°C when surrounded by 72 weight percent lamellar sodium lauryl ether sulfate aqueous solution. Cross polarized light microscopy, dynamic scanning calorimetry, and small angle x-ray scattering were used to analyze the phases present and the growth rate of the hexagonal phase. The effects of bilayer alignment through preshear and annealing before heating and gap size on the hexagonal growth rate were investigated. It was found that under normal conditions with a gap size of 400 µm the hexagonal phase had a linear growth rate of 2.7 µm/min. Keywords: Surfactant; Interface; Phase

Source:

Purdue University / 2024

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Co-authors:

Evan R Williams