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This paper is focused on the phase behavior, interaction with anionic surfactant sodium dodecyl sulfate SDS, adsorption and wetting investigations of new hydroxy mixed ether nonionic surfactants HME n . The phase diagrams of (0.1–100) %wt of HME n  (n-value is the ethoxylation number EO) at the temperature range 20–100°C have shown that the increasing of n-value raises the cloud boundary toward higher temperature. Remarkable result was obtained from the interaction between SDS and HME B , at which the mixed system exhibits a unique homogeneity and a liquid crystal phase formation. Macroscopically, the liquid crystal region was found when the SDS concentration range between 8 and 24 mM mixed with 10% wt HME B . The interaction between HME n  and mica was also investigated using atomic force microscopy AFM and a pronounced adsorption of HME n  on mica was observed. Moreover, contact angle results reveal that glass substrate shows strong wettability of HME n  surfactant solutions compared with polyethylene PE and polymethylmethaacrylate PMMA substrates. This wettability however also decreases with EO number.

Physiochemical Properties of Hydroxy Mixed Ether HME n Surfactants and their Interaction with Sodium Dodecyl Sulfate SDS