Pressure effects on lipidic direct phases: The dodecyl trimetyl ammonium chloride-water system

Article Abstract:

The direct lyotropic polymorphism of dodecyltrimethyklammonium chloride (DTAC) is investigated by synchrotron X-ray diffraction at different water concentrations under compression up to 2 kbar. It is revealed that the molecular parameters of DTAC calculated in the different phases during compression confirmed that pressure induces small but continuous confromational changes, definitely different from the large changes observed in lipid molecules forming type III structures.

Usage, Electric properties, X-rays, X-ray diffraction

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Raman observation of the interactions between N[H.sub.4.sup.+], S[O.sub.4.sup.2-], and [H.sub.2]O in supersaturated [(N[H.sub.4]).sub.2]S[O.sub.4] droplets

Article Abstract:

The high signal-to-noise ratio (S/N) Raman spectra of [(N[H.sub.4]).sub.2]S[O.sub.4] droplets deposited on a quartz substrate which are obtained from dilute to supersaturated states upon decreasing the relative humidity (RH) are reported. The studies provide insight into interactions between ions and those between ions and water molecules in [(N[H.sub.4]).sub.2]S[O.sub.4] droplets, particularly in supersaturated states on a molecular level.

Analysis, Spectra, Raman spectroscopy, Humidity, Gaussian processes, Structure, Chemical properties

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