NMR and SANS studies of aggregation and microemulsion formation by Phosphorus fluorosurfactants in liquid and supercritical carbon dioxide

Article Abstract:

NMR relaxation and diffusion studies are performed on water-in-CO(sub 2) (W/C) microemulsion systems formed with phosphorus fluorosurfactants of bis[2-(F-hexyl)ethyl] phosphate salts (DiF(sub 8)), having different counterions (Na(super +), NH(sub 4)(super +), N(CH(sub 3)(sub 4)(super +)) by means of high pressure in situ NMR. NMR relaxation measurements show that the entrapped water has restricted motion, and there is little free water in the core.

Surface active agents, Surface Active Agent Manufacturing, Usage, Nuclear magnetic resonance spectroscopy

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Solvent anions in supercritical carbon dioxide: formation of complexes with polar solutes

Article Abstract:

The high-mobility mutimeter solvent radical anions in supercritical carbon dioxide form stable complexes with water, aliphatic alcohols, alkyl halides and alkyl nitriles. The result indicates that the stability of the complex increases with the dipole moment of the polar group and decreases with the substitution at the alpha carbon.

Radicals (Chemistry), Alkyl groups

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Synthesis and formation of silica aerogel particles by a novel sol-gel route in supercritical carbon dioxide

Article Abstract:

A new method to obtain silica aerogel particles is proposed using acetic acid as the condensation agent for silicon alkoxides in supercritical carbon dioxide (scCO2). The mechanism of silica aerogel formation in scCO2 using in situ analysis techniques is determined.

All Other Basic Inorganic Chemical Manufacturing, Silicon & Inorganic Compounds, Silicon compounds, Aerogels

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