Texture change separate from the transition between two tilted phases in Langmuir monolayers

Article Abstract:

Research was conducted to examine the transition state between monolayers of palmityl acetate and the transition between the tilted monolayer phases using grazing-incidence X-ray diffraction. The monolayers were observed to undergo a transition from a phase with alkyl chains tilted toward nearest neighbors to a phase with chains tilted toward next-nearest neighbors upon monolayer compression. The crossover from one texture to the other is found to be separate from the transition between the tilted phases.

Acetates

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Similarities in the phase properties of Gibbs and Langmuir monolayers

Article Abstract:

Experiments were conducted to analyze and compare condensed-phase structures of adsorbed Gibbs monolayers and spread Langmuir monolayers in acid amide compounds. The parameters of comparison included the thermodynamic behavior, configuration and crystal structures of the monomolecular layers. The Brewster angle microscopy was utilized to examine the monolayers' condensed-phase domains. The findings revealed that defects in the Gibbs monolayers were less in comparison with the Langmuir monolayers.

Thermodynamics, Surface chemistry

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Influence of cholesterol on domain shape and lattice structure in arachidic acid monolayers at high pH

Article Abstract:

Monolayer mixtures of arachidic (eicosanoica) acid with cholesterol are investigated on a subphase of pH 12.0 at 25 degree Celsius using grazing incidence X-ray diffraction (GID) and Brewater angle (BAM). It was concluded that the isolation of the domains embedded in a condensed matrix allows the observation of the recovery of the inner domain structure with variation of the surface pressure.

Science & research, Lattice dynamics, Cholesterol, Eicosanoic acid

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