Abstract
Different from conventional nonionic poly(oxyethylene) surfactants, poly(oxyethylene) cholesteryl ethers, ChEOn, possess a bulky and nonflexible hydrophobic part and form a variety of self-organized structures in water. We investigated the phase behavior and the micellar structures in the water/ChEO15 and water/ChEO10 systems by means of visual observation, rheometry, small-angle X-ray scattering (SAXS), dynamic light scattering (DLS), dielectric relaxation spectroscopy (DRS), and densimetry. We found that in the water/ChEO15 system, aqueous micellar (Wm), discontinuous micellar cubic (I1) with Fd3m space group, hexagonal (H1), rectangular ribbon (R1), and lamellar (Lα) phases are formed, whereas Wm, unknown, R1, defected lamellar ( ), and Lα phases are produced in the water/ChEO10 system at ambient temperatures. Compared with a conventional aqueous nonionic surfactant system, the intermediate R1 phase region is incredibly wide. As for the water/ChEO15 system, with increasing water content, the packing pa...
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