Interfacial phenomena at the compressed co2-water interface

Abstract

-Compressed CO 2 is considered to be a viable alternative to toxic volatile organic solvents with potential applications in areas including separation reactions, and materials formation processes. Thus an interest in CO 2 stems from the fact that it is very inexpensive, has low toxicity, and is not a regulated. However, compressed CO 2 has a zero dipole moment and weak van der Waals forces and thus is a poor solvent for both polar and most high molecular weight solutes, characteristics that severely restrict its applicability. In order to overcome this inherent inability, surfactant-stabilized organic and aqueous dispersions in CO 2 have been proposed. This work will discuss fundamentals and recent advances in the design of amphiphiles for the novel CO 2 -water interface.

Tetrakis(dimethylamino)ethylene Chemiluminescence (TDE CL) Characterization of the CMC and the Viscosity of Reversed Microemulsions

“…Further increasing the concentration of surfactant in the system will result in aggregation of the surfactants while the concentration of the free surfactant monomers remains virtually constant in the bulk phase . The thermodynamic properties (free energy, enthalpy, entropy, and heat capacity) of a RMS can be obtained if the CMC of a RMS is known. − The CMC of a RMS is the most important property when the surfactant’s architecture is going to be designed for various applications in RMS (especially for application in a water-in-scCO 2 microemulsion). ,, …”

Biocompatible, Lactide-Based Surfactants for the CO2−Water Interface: High-Pressure Contact Angle Goniometry, Tensiometry, and Emulsion Formation

“…Supercritical or near-critical fluids are environmentally benign candidates for the replacement of volatile organic solvents . They possess solvent strength that can be tuned with not only temperature but also pressure . The ability to achieve wide variations in density with small changes in pressure has tremendous practical relevance, as for example by facilitating downstream separation processes .…”

“…1 They possess solvent strength that can be tuned with not only temperature but also pressure. 2 The ability to achieve wide variations in density with small changes in pressure has tremendous practical relevance, as for example by facilitating downstream separation processes. 3 CO 2 is a particularly attractive compressible solvent because of its low cost, nontoxicity, mild critical point, and nonflammability.…”