Search results for " reversed micelles"

showing 3 items of 3 documents

Physicochemical investigation of cobalt?iron cyanide nanoparticles synthesized by a novel solid?solid reaction in confined space

2004

Cobalt–iron cyanide (Cox[Fe(CN)6]) nanoparticles have been synthesized by a novel solid–solid reaction in the confined space of dry sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reversed micelles dispersed in n-heptane. The reaction has been carried out by mixing two dry AOT/n-heptane solutions containing CoCl2 and K4Fe(CN)6 or K3Fe(CN)6 nanoparticles in the micellar core, respectively. By UV-Vis spectroscopy it was ascertained that, after the mixing process, the formation of stable nanoparticles is fast and complete. Microcalorimetric measurements of the thermal effect due to the Cox[Fe(CN)6] nanoparticle formation allowed the determination of the stoichiometric ratio (x) and of the molar e…

Polymers and PlasticsSmall-angle X-ray scatteringCyanidechemistry.chemical_elementNanoparticleMicellechemistry.chemical_compoundColloid and Surface ChemistryAdsorptionCobalt–iron cyanide complexes Nanoparticles Solid–solid reaction Confinement effect AOT reversed micelleschemistryX-ray photoelectron spectroscopyMaterials ChemistryPhysical chemistryOrganic chemistryPhysical and Theoretical ChemistryCobaltStoichiometrySettore CHIM/02 - Chimica FisicaColloid and Polymer Science
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Localization and interactions of melatonin in dry cholesterol/lecithin mixed reversed micelles used as cell membrane models

2005

The state of melatonin confined in dry cholesterol/lecithin mixed reversed micelles dispersed in CCl4 was investigated using 1H-NMR and FT-IR spectroscopies as a function of the melatonin to lecithin molar ratio (R(MLT)) and of the cholesterol to lecithin molar ratio (R(CHL)). An analysis of experimental results leads to the hypothesis that, independent of R(MLT) and as a consequence of anisotropic melatonin/lecithin, melatonin/cholesterol and cholesterol/lecithin interactions, melatonin is totally solubilized in reversed micelles. Melatonin is mainly located in and oriented in the nanodomain constituted by the hydrophilic groups of cholesterol and lecithin. A competition of melatonin and c…

endocrine systemMagnetic Resonance Spectroscopyfood.ingredientCCL4Models BiologicalLecithinMicelleMelatoninCell membranechemistry.chemical_compoundEndocrinologyfoodPhosphatidylcholineSpectroscopy Fourier Transform InfraredmedicineMicellesMelatoninChromatographyCholesterolCell Membranetechnology industry and agricultureNuclear magnetic resonance spectroscopyCholesterolmedicine.anatomical_structurechemistryPhosphatidylcholineslipids (amino acids peptides and proteins)cell membrane models cholesterol confinement effects lecithin melatonin reversed micelleshormones hormone substitutes and hormone antagonistsmedicine.drugJournal of Pineal Research
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Supramolecular Aggregates in Vacuum: Positively Mono-Charged Sodium Alkanesulfonate Clusters

2010

The formation and structural features of positively mono-charged aggregates of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and sodium methane—(MetS), butane—(ButS) and octane—(OctS) sulfonate molecules in the gas phase have been investigated by electrospray ionization mass spectrometry, energy-resolved mass spectrometry and density functional theory (DFT) calculations. The experimental results show that the center-of-mass collision energy required to dissociate 50% of these mono-charged aggregates scantly depends on the length of the alkyl chain as well as on the aggregation number. This, together with the large predominance of mono-charged species in the mass spectra, was rationalized i…

AlkanesulfonatesSpectrometry Mass Electrospray IonizationAmphiphilic moleculeVacuumChemistryElectrospray ionizationSodiumSodiumSupramolecular chemistrychemistry.chemical_elementGeneral MedicineAtomic and Molecular Physics and Opticschemistry.chemical_compoundSulfonateTandem Mass SpectrometrySupramolecular aggregates amphiphilic molecules surfactants reversed micelles ESI MS ESI MS/MS energy resolved mass spectrometry DFT calculationsQuantum TheoryOrganic chemistrySpectroscopyEuropean Journal of Mass Spectrometry
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