Partitioning of ethoxylated octylphenol surfactants in microemulsion-oil-water systems: influence of temperature and relation between partitioning coefficient and physicochemical formulation

Jean-Louis Salager (1) , Laura Márquez (1, 2) , Alain Graciaa (2) , Jean Lachaise (2)

1 Laboratorio FIRP
2 TEFC - Thermodynamique et Energétique des fluides complexes

The partitioning coefficient of a surfactant between oil and water is related to the free energy of transfer from one phase to the other. The influence of temperature on the partition coefficient of octylphenol ethoxylate oligomers between oil and water is reported. The variation of the partition coefficient with formulation variables can be used as a yardstick for the concept of generalized formulation expression.

Mots clés: Engineering controlled terms: Chemical reactions; Free energy; Organic compounds; Phase composition; Temperature; Thermal effects; Thermodynamics Engineering uncontrolled terms: Ethoxylated octylphenol; Ethoxylation; Partitioning coefficient; Physicochemical formulation Engineering main heading: Surface active agents

Domaines: Chimie-Physique [physics.chem-ph]

Jean-Louis Salager, Laura Márquez, Alain Graciaa, Jean Lachaise. Partitioning of ethoxylated octylphenol surfactants in microemulsion-oil-water systems: influence of temperature and relation between partitioning coefficient and physicochemical formulation. Langmuir, 2000, 16 (13), pp.5534-5539. ⟨10.1021/la9905517⟩. ⟨hal-00703357⟩