Weak first-order tilting transition in monolayers of mono- and bipolar docosanol derivatives

Article Abstract:

The bipolar amphiphile 22-methoxydocosan-1-ol (H3C-O-(CH2)22-OH, MDO) and the monopolar amphiphle dicosyl methyl ether (H3C-(CH2)21-O-CH3, DME) were selectively synthesized for the first time as model compounds to elaborate the effect of a second polar group on the monolayer behavior by comparison with the corresponding alcohol docosan-1-ol (H3C-[CH2).sub.21-OH, DO). GIXD data show that the monolayers exhibit the phase sequence L2'-S at lower temperature and L2'-LS at higher temperature.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Methyl Ether, Monomolecular films, Photoelectron spectroscopy, Structure

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Effect of fluorination of the hydrophilic heads on morphology and molecular structure of Langmuir monolayer of long-chain ethers

Article Abstract:

Brewster angle microscopy (BAM) and grazing incidence X-ray diffraction (GIXD) are used to compare morphology and molecular structure of Langmuir monolayer of docosyl trifluoroethyl ether (DFEE) and docosyl ethyl ether (DEE) on water. The DEE islands and the DEE monolayer at low surface pressure exhibit strong in-plane optical anisotropy, while the DFEE islands and the compact DFEE film are isotropic.

Science & research, Research, Molecular structure, Thin films, Multilayered, Multilayered thin films

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The effect of headgroup interactions on structure and morphology at arachidic acid monolayers

Article Abstract:

The structural and morphological features of arachidic acid monolayers are studied systematically between pH 2 and 13 by x-ray diffraction, microscopy and thermodynamic measurements on subsolutions free of polyvalent ions. A monotonic relationship is found between the pH and the distortion of the lattice perpendicular to the chain axes.

Analysis, Spectra, Hydrogen-ion concentration, pH measurement, pH, Eicosanoic acid

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