Abstract
Methoxy ethyl oleate, a nonionic surfactant, has been investigated at the air/water interface for various surface properties by employing the Langmuir film balance technique. The ester forms an expanded isotherm at the air/water interface. The minimum area of packing (A 0), initial area of increase of surface pressure (A i ), collapse pressure (π c ), and area/molecule at collapse pressure (A c ) have been estimated from the isotherm curve.The higher compressibility coefficient (K) suggests that the ester forms a more expanded liquid film than the parent oleic acid. Besides, the ester film is fairly stable as suggested by only about 30% loss in area over a period of 20 min. The relaxation rates of the ester film at different surface pressures of 10, 15, and 20 mN·m−1 have been estimated from changes in the surface area/molecule with time. Interestingly, the surface area (54.2 Å2/molecule) that corresponds to a minimized structure projected for the ester, calculated theoretically, agrees reasonably well with the experimental value (57.2 Å2/molecule).
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Baskar, G., Venkatesan, S., Dhathathreyan, A. et al. Two-dimensional surface properties of 2-methoxy ethyl oleate at the air/water interface. J Amer Oil Chem Soc 76, 853–858 (1999). https://doi.org/10.1007/s11746-999-0076-5
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DOI: https://doi.org/10.1007/s11746-999-0076-5