Abstract
The effect of the alkyl-chain substitution on ordering and phase behavior of monoglycerol esters is studied by coupling the results of surface pressure−area (π−A) isotherm measurements, Brewster angle microscopy, and grazing incidence X-ray diffraction. In the present work, structure features and phase behavior of 1-(12-hydroxy)stearoyl-rac-glycerol monolayers are investigated and compared with those of the nonsubstituted 1-stearoyl-rac-glycerol and 12-hydroxystearic acid monolayers. The dominating effect of the alkyl-chain substitution by a hydroxyl group in the 12 position on the monolayer properties is demonstrated. Phase behavior, domain morphology, and two-dimensional lattice structure of the two 12OH-substituted amphiphiles are similar to each other but different from those of the usual nonsubstituted amphiphiles. Main characteristics of the 1-(12-hydroxy)stearoyl-rac-glycerol monolayers are an extended flat phase-transition (plateau) region of the π−A isotherms related with a small temperature depe...
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