14N NMR spectra of molecular nitrogen in SDS/pentanol swollen lamellar phases

✍ Scribed by Giorgio Pellizer; Fioretta Asaro

• Book ID: 102529668
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 273 KB
• Volume: 46
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.2299

✦ Synopsis

spectra of air dissolved in lyotropic mesophases are reported. In order to observe the whole spectrum from a molecule in which the quadrupole coupling constant is on the order of a few megahertz, a weak alignment degree with respect to the magnetic field is mandatory. Therefore, dilute lyotropic liquid crystals, namely sodium dodecylsulphate (SDS)/pentanol swollen lamellar phases, were considered. The temperature dependence of the 14 N quadrupolar splitting was followed both in the case of oil (either n-dodecane or n-heptane) and brine (a 0.2-M NaBr water solution) swelling. In the former, it paralleled the temperature dependence of the splittings of the alkane deuteria and, in both cases, it was opposite to 23 Na quadrupolar splittings. Owing to the higher N 2 solubility in hydrocarbons, the 14 N NMR spectra provide complementary information to that obtained by means of the quadrupolar nuclei of water and hydrophilic solutes.