Nonionic Microemulsion: Mechanism of Formation and Percolation

Autor:	Nabil Naouli, Henri L. Rosano
Rok vydání:	2009
Předmět:	Ethylene Chromatography Polymers and Plastics Analytical chemistry Hexadecane Surfaces Coatings and Films chemistry.chemical_compound Adsorption chemistry Pulmonary surfactant Emulsion Titration Microemulsion Particle size Physical and Theoretical Chemistry
Zdroj:	Journal of Dispersion Science and Technology. 30:370-378
ISSN:	0193-2691
DOI:	10.1080/01932690802548387
Popis:	A series of microemulsions, both W/O and O/W, based on nonionic surfactants of the form (NP(EO)n), were prepared using the titration method. Mixing a constant weight of surfactant with a constant volume of the dispersed phase and an initial volume of continuous phase produces an emulsion, which is titrated to clarity with another surfactant (cosurfactant). Plotting (a) the volume of cosurfactant necessary to transform an emulsion into a microemulsion containing a fixed volume of dispersed phase and constant weight of surfactant versus (b) different initial continuous-phase volumes yields a straight line. Extrapolating from experimentally determined values for the cosurfactant volume to the value corresponding to a zero-volume continuous phase allows the determination of the surfactant molar composition and the average number of ethylene oxides (EO) per nonylphenol adsorbed at the interface. Using a surfactant with the same number of ethylene oxides yields a single-surfactant microemulsion. Measurement of ...
Databáze:	OpenAIRE
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