From nucleation to engineering of crystalline architectures at air-liquid interfaces

Article Abstract:

Issues concerning the investigation of three regimes of molecular organization at the air-solution interface by the use of grazing incidence X-ray diffraction are discussed.

Research and Development in the Physical, Engineering, and Life Sciences, Chemistry, Research, Chemical research, Chemistry, Physical and theoretical, Physical chemistry

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Monitoring the nucleation of crystalline films of cholesterol on water and in the presence of phospholipid

Article Abstract:

A study using surface-sensitive techniques determined the nucleation of two-dimensional crystals of pure cholesterol and its mixtures with dipalmitoylphosphatidylcholine at the air-water interface. Based on grazing-incidence X-ray diffraction measurements, there is a transition from a monolayer to a highly crystalline rectangular phase, with thickness of two layers. Moreover, atomic force microscopy revealed that films transferred onto solid support possesses elongated and faceted crystallites with thickness of approximately 10 layers. Lastly, the phospholipid additive lowered the crystallinity of the cholesterol in two mixtures.

Phospholipids, Cholesterol, Crystallization, Nucleation, Nucleation (Chemistry)

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Use of diastereomeric interactions to probe the inplane attachment of water-soluble molecules to the polar had groups of Langmuir films of Cu-alpha amino acid complexes

Article Abstract:

A study investigated the interactions between the amphiphilic diastereomeric copper-alpha-amino acid complexes at the air-solution interface and water-soluble complexes of the environment. Structures of Langmuir thin films of select, optically resolved S or R and racemic alpha-amino acids were examined on pure copper acetate solution in the presence of (S)- or (R)-alanine, -serine and -valine. Experimental methods, findings and conclusions are discussed.

Fatty acids, Coordination compounds, Amino acids, Copper compounds

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